Pumping Stations. Double Control Unit for Two Pumps with or without Explosion Protection with Bubbler Control System (Dynamic) DDEL / DSEL

Transcription

1 Operating Instructions Control Unit Pumping Stations Double Control Unit for Two Pumps with or without Explosion Protection with Bubbler Control System (Dynamic) DDEL / DSEL from series S-C Operating Instructions These operating instructions apply exclusively to the control unit. These operating instructions contain fundamental information and precautionary notes. Please read the manual thoroughly prior to installation of unit, connection to power supply and commissioning. Please note! The descriptions and instructions in this manual only refer to the standard version of the KSB switchgear only. Theseoperatinginstructions neithercover alldesign detailsand variants nor any eventualities or events which might occur during installation, operation or maintenance. The switchgear and controlgear assembly requires handling and operation by properly trained personnel (see EN ). For information or instructions not given in this manual, contact the nearest KSB service centre. The manufacturer accepts no liability for the switchgear and controlgear assembly if the instructions in this manual are not complied with. For KSB service centres, please refer to the attached list of addresses. Operation and use of the switchgear and controlgear assembly are subject ot the provisions of EN

2 EC declaration of conformity Herewith we declare that the low-voltage switchgear and controlgear assemblies DDEL, DSEL comply with the following relevant provisions as applicable in their current version: EC electromagnetic compatibility directive 89/336/EC, Annex I and EC directive on low-voltage equipment 73/23/EC, Annex III B. Applied harmonized standards, in particular EN Part 1 (1.3.93), EN Part 2 (1.1.96), EN (1.4.94) Hansjörg Heinrich Senior Manager Small Systems KSB Aktiengesellschaft, Bahnhofplatz 1, D Pegnitz Contents Page 1 General 3 2 Safety Marking of instructions in the manual Personnel qualification and training Non-compliance with safety instructions Safety awareness Safety instructions for the operator/user Safety instructions for maintenance, inspection and installation work Unauthorized modification and manufacture of spare parts Unauthorized modes of operation 4 3 Transport and interim storage Transport Interim storage 4 4 Description Technical specification Designation Standard switchgear Pictogram symbols Description of switchgear DDEL DSEL Operating and display elements Optional equipment 6 Page 5 Installation at site Ambient conditions Connection to power supply 6 6 Commissioning / Shutdown General Pump cable and bubbler tube installation Potential equalization Function Commissioning / Start-up Electronic pressure switch Setting the electronic pressure switch DDEL and DSEL switchgear Shutdown 10 7 Returning to service 10 8 Maintenance 10 9 Troubleshooting Wiring diagrams Wiring diagram for DDEL Wiring diagram for DDEL Wiring diagram for DSEL Wiring diagram for DSEL Measurement pick-up Installation in tanks/sumps of any design (incl. CK and CB) 15 2

3 1 General This KSB product has been developed in accordance with state-of-the-art technology; it is manufactured with utmost care and subject to continuous quality control. These operating instructions are intended to facilitate familiarization with the equipment and its designated use. The manual contains important information for reliable, proper and efficient operation. Compliance with the operating instructions is of vital importance to ensure reliability and a long service life of the equipment and to avoid any risks. These operating instructions do not take into account local regulations; the operator must ensure that such regulations are strictly observed by all, including the personnel called in for installation. The equipment must not be operated beyond the limit values for the operating voltage, rated mains frequency, ambient temperature and switching capacity specified in the technical documentation. Make sure that operation is in accordance with the instructions laid down in this manual or in the contract documentation. The name plate indicates the type series / size, main operating data and serial number; please quote this information in all queries, repeat orders and particularly when ordering spare parts. If you need any additional information or instructions exceeding the scope of this manual or in case of damage please contact KSB s nearest customer service centre. 2 Safety These operating instructions contain fundamental information which must be complied with during installation, operation and maintenance. Therefore this operating manual must be read and understood both by the installing personnel and the responsible trained personnel / operators prior to installation and commissioning, and it must always be kept close to the location of operation of the machine / unit for easy access. Not only must the general safety instructions laid down in this chapter on Safety be complied with, but also the safety instructions outlined under specific headings. 2.1 Marking of instructions in the manual The safety instructions contained in this manual whose non-observance might cause hazards to persons are specially marked with the general hazard sign, namely safety sign in accordance with ISO The electrical danger warning sign is safety sign in accordance with IEC The word Caution is used to introduce safety instructions whose non-observance may lead to damage to the equipment and its functions. 2.2 Personnel qualification and training All personnel involved in the operation, maintenance, inspection and installation of the unit must be fully qualified to carry out the work involved. Personnel responsibilities, competence and supervision must be clearly defined by the operator. If the personnel in question is not already in possession of the requisite know-how, appropriate training and instruction must be provided. If required, the operator may commission the manufacturer / supplier to take care of such training. In addition, the operator is responsible for ensuring that the contents of the operating instructions are fully understood by the responsible personnel. 2.3 Non-compliance with safety instructions Non-compliance with safety instructions can jeopardize the safety of personnel, the environment and the equipment itself. Non-compliance with these safety instructions will also lead to forfeiture of any and all rights to claims for damages. In particular, non-compliance can, for example, result in: -- failure of important euqipment functions -- failure of prescribed monitoring methods -- hazard to persons by electrical, mechanical and chemical effects. 2.4 Safety awareness It is imperative to comply with the safety instructions contained in this manual, the relevant national health and safety regulations and the operator s own internal work, operation and safety regulations. 2.5 Safety instructions for the operator / user Electrical hazards must be eliminated. (In this respect refer to the relevant safety regulations applicable to different countries and/or the local energy supply companies.) 2.6 Safety instructions for maintenance, inspection and installation work The operator is responsible for ensuring that all maintenance, inspection and installation work be performed by authorized, qualified specialist personnel who are thoroughly familiar with the manual. Any work on the equipment shall only be performed with the equipment de-energized. Immediately following completion of the work, all safetyrelevant and protective devices must be re-installed and/ or re-activated. Please observe all instructions set out in the chapter on Commissioning / Start-up before returning the unit to service. 3

4 2.7 Unauthorized modification and manufacture of spare parts Modifications or alterations of the equipment supplied are only permitted after consultation with the manufacturer. Original spare parts and accessories authorized by the manufacturer ensure safety. The use of other parts can invalidate any liability of the manufacturer for consequential damage. 2.8 Unauthorized modes of operation The warranty relating to the operating reliability and safety of the equipment supplied is only valid if the equipment is used in accordance with its designated use. The limits stated in the data sheet must not be exceeded under any circumstances. 3 Transport and interim storage 3.1 Transport Transport of the equipment requires proper preparation and handling. Floor-mounted cabinets must always be transported in upright position to keep the mounting plate from sagging. Prior to dispatch, the equipment was tested and inspected to ensure full compliance with specifications. Consequently, the equipment should be in perfect electrical and mechanical condition upon arrival at its destination. It is recommended that the equipment be inspected for in-transit damage immediately upon receipt. In case of any objections, the recipient and carrier must jointly draw up a damage report. 3.2 Interim storage The equipment shall only be stored under dry and vibration-free conditions in its original packaging, if possible. Ambient temperature shall be within --10 C and +50 C. 4 Description 4.1 Technical specification The descriptions and instructions put forth in this manual refer to the standard models of the original KSB switchgear only. The KSB standard switchgear types DDEL and DSEL are low-voltage switchgear and controlgear assemblies to EN designed to control and protect two threephase drives. Motors up to and including 4 kw are started up d.o.l., motors from 5.5 kw are operated in stardelta starting method. 4.2 Designation Standard switchgear The switchgear designation is made up of letters and figures. E= Single control D= Double control D= d.o.l. starting S= star-delta starting E= explosion-proof L= bubbler control X special design Max. amperage x 10 Code number Pictogram symbols LED display Key High water Fault Manual mode Automatic mode Pump running Pump fault Acknowledgement Unit energized E/D D/S E S/L X

5 DDEL, DSEL Description of switchgear DDEL Rated voltage to IEC 38 Setting range (up to A...) Control voltage Rated insulation voltage Enclosure Mains type Dimensions HxWxD Weight DSEL Rated voltage to IEC 38 Setting range (up to A...) Control voltage Rated insulation voltage Enclosure Mains type Dimensions HxWxD Weight 3/N/PE AC 400 V / 50 Hz A AC 230 V AC 690 V IP 54 TN-C-S mains 600x400x200 mm (standard) 18 kg Components installed F 1 master switch with emergency OFF function f 1 control transformer F 2 motor protection switches F 2 mains contactors F 2 green lamps F 2 red lamps F 2 thermistor tripping units F 1 relay module for pump control F 1 pump changeover relay F 1 diaphragm pump F 1 electronic pressure switch F terminal strips for connection of mains, motor, winding protection (bimetal/ptc) f 1 ammeter per pump f 1 operating hours counter per pump f 1 voltmeter f 1 monitoring relay f 1 heater with thermostat f 1 mains-independent alarm f 1 remote transmission module Photo shows optional equipment 3/N/PE AC 400 V / 50 Hz A AC 230 V AC 690 V IP 54 TN-C-S mains 600x400x200 mm (standard) 18 kg Components installed F 1 master switch with emergency OFF function f 1 control transformer F 2 motor protection switches F 2 mains contactors F 2 delta contactors F 2 star contactors F 2 time relays F 2 green lamps F 2 red lamps F 2 thermistor tripping units F 1 relay module for pump control F 1 pump changeover relay F 1 diaphragm pump F 1 electronic pressure switch F terminal strips for connection of mains, motor, winding protection (bimetal/ptc) f 1 ammeter per pump f 1 operating hours counter per pump f 1 voltmeter f 1 monitoring relay Photo shows optional equipment f 1 heater with thermostat f 1 mains-independent alarm f 1 remote transmission module 5

6 4.4 Operating and display elements Master switch with emergency OFF function for switching the unit on and off H-0-A selector switch The pump is switched on and off with a three-position switch (manual-0-automatic selector switch). There is a separate switch for each pump. 0 position: The pump is switched off. Automatic position: Manual (H) position: Caution Caution The pump is switched on and off by an external transmitter. If both switches are set to automatic mode, the pumps are operated alternatingly after each switching cycle. If one of the pumps fails, the system immediately switches over to the other pump. When the switch is set to manual mode, the pump is started up manually. The switchgear must never be operated unsupervised in manual mode. Manual mode also means continuous operation, and liquid level control is deactivated! Caution! Danger of dry running! green lamp: Pump X running The lamp lights up when the mains contactor (DDEL) or the delta contactor (DSEL) picks up. The lamp goes out when the mains contactor (DDEL) or the delta contactor (DSEL) drops off. red lamp: Fault at pump X The red lamp signals a fault if -- the motor protection switch or -- the bimetal switch integrated in the winding (monitoring circuit) or -- the thermistor tripping unit (manual reset, limiting circuit) has tripped the pump. If the motor protection switch or the thermistor tripping unit have tripped the pump, the failure cause must be investigated prior to re-starting the pump (also refer to pump operating manual): Resetting the unit without prior investigation may cause personal injury and damage to property. The bimetal switch in the monitoring circuit trips the motor at cut-out temperature and re-starts it automatically when the motor has cooled down. If this protection element has tripped the pump repeatedly, make sure to investigate the cause of the fault. If in doubt, please contact KSB s customer service. 4.5 Optional equipment -- Operating hours counter -- Ammeter -- Master switch -- Voltmeter with changeover switch -- Monitoring relay (phase sequence / failure, overvoltage and undervoltage) -- Outdoor cabinet of polyester with plastic base -- Control cabinet heater -- Warning light for outdoor cabinet 5 Installation at site 5.1 Ambient conditions -- dry -- sufficient ventilation -- lockable; unauthorized access must be prevented The switchgear and controlgear assembly must be protected against flooding. The switchgear assemblies are not explosion-proof and therefore must only be operated outside hazardous areas. 5.2 Connection to power supply F Connection to power supply shall be effected by specialist personnel only (EN ). F All connections shall be effected in accordance with the technical specifications issued by the local energy supply company. F Check type of current and voltage of the mains! F For mains fusing to be supplied at site please refer to the wiring diagram. F Verify data of submersible pumps (name plate). F Set motor protection switch to rated current. F Size of power supply cable as per DIN VDE 0100, Part 430. The cable provided at the site must be connected to ensure a clockwise rotating field. The pump cable shall be connected to the switchgear as shown on the wiring diagram. The pump motors can be fitted both with 3 control wires and 4 control wires for the controlling and limiting circuits. Wiring shall be performed in accordance with the wiring diagram. For pumps without thermal circuit breaker, the relevant terminals must be bridged. Caution Pumps without thermal circuit breaker must not be operated as explosion-proof pumps. 6

7 6 Commissioning, start-up / Shutdown 6.1 General Commissioning shall only be conducted in full compliance with all pertinent VDE (German Association of Electrical Engineers) specifications. Before starting up the switchgear and controlgear assembly make sure that -- the pump cable has been connected, -- the thermal circuit breaker has been connected, -- the power supply cable has been connected correctly (clockwise rotating field for three-phase motors), -- the transmitter (bubbler tube, pressure bell, bellows,...) has been installed and adjusted. Only after these operations have been performed by a trained electrician, commissioning of the switchgear and controlgear assembly may start. Compliance with the terminal plan of the wiring diagram and the pump operating manual is of paramount importance for this work. Water accumulating in the tube may cause the switching point to shift or may freeze if the tube is not protected against frost, resulting in switchgear failure. In regions where temperatures are likely to fall below freezing, the vent pipe and/or the bubbler tube, if required, should be insulated. For additional protection, we recommend to install the control cabinet heater available as optional equipment. Run the pump cable through the cable gland provided and firmly tighten the gland (strain relief). Fasten the bubbler tube to the gland of the switchgear and tighten. Caution Gases from the tank must not reach the control cabinet under any circumstances. Therefore, the entry of the cable/bubbler line from the tank into the control cabinet must be gas-tight! Pump cable and bubbler tube installation Run pump cable, potential equalization conductor and bubbler tube through the owner-supplied vent pipe to the switchgear. To keep water vapour condensation from accumulating in the line, run the bubbler tube uphill the entire way from the submerged end to the switchgear Potential equalization In hazardous areas, potential equalization must be ensured to avoid sparking. F Piping to VDE mm 2 Cu. The terminal must be connected to the local potential equalization element by a single 6-mm 2 Cu wire. F Pump to EN or VDE 0170/ mm 2 Cu. For pump connection please refer to the Amarex or Ama-Porter operating manual. Terminal for connection of potential equalisation element to the local potential equalization element to the local potential equalization element 7

8 6.2 Function The pumps are switched on and off alternatingly, depending on the liquid level. If required, the peak load pump cuts in automatically. If the medium handled reaches the start-up level of pressure switch 1 (lower level, factory-set to 400 mm), one of the pumps is started up. The medium handled is pumped off until the liquid level reaches the cut-out level of the pressure switch (factoryset to 200 mm). With new liquid flowing into the tank, the start-up level of the pressure switch is reached again. Now the second pump is switched on and once the cut-out level has been reached switched off again. This switching cycle is repeated after every switch-off. If the medium handled reaches the upper level of the pressure switch (factory-set to 500 mm) although the pump is running, the second pump will cut in (peak load). If the water level continues to rise although the pumps are running (e. g. due to heavy rainfall), an alarm contact will be activated (factory-set to 600 mm). If one of the pumps has been tripped by the thermal circuit breaker (monitoring or limiting circuit) or by the motor protection switch, changeover to the other pump (stand-by) is triggered immediately. When the switch is set to manual mode, the pump can be started up directly. However, this should be done above the cut-out level and for short periods only, e.g. for checking the direction of rotation. Otherwise, the selector switch shall always be set to automatic when the unit is started up. 6.3 Commissioning / Start-up Caution The following work must always be performed. Compliance with the instructions in sections and is essential. -- Set master switch to Set H-0-A selector switch to Compare the setting of the motor protection switch with the rated current of the pump and adjust, if necessary. Amarex I = I N Ama-Porter I = I N x Set motor protection switch to I. -- Energize by switching the site-supplied fusing (e.g. automatic circuit breaker) ON. -- Set master switch to I. -- Verify the direction of rotation. To do so, set H-0-A selector switch to H (manual) only if liquid level is above cut-out level! Make sure to comply with the operating manual of the respective pump/installation Elektronic pressure switch Switchgear types DDEL and DSEL are equipped with an electronic pressure switch. The pressure switch is set at the factory. ON OFF Alarm 600 mm 500 mm Peak load pump 500 mm 200 mm Base load pump 400 mm 200 mm The data supplied refer to CK tanks and are given in mm above tank floor Setting the electronic pressure switch Switching points have been optimized in the factory and need not be modified for standard systems (off-the-shelf pump programme). For customized systems, switching points will have to be adapted to system conditions. To change switching points, the electronic pressure switch can be run in a special test mode. To do so, press the Test button for approx. two seconds. The unit will confirm the Test mode optically by the green test LED flashing. The four LEDs N1, P1, P2, AL now indicate whether the current liquid level is above or below the relevant switching threshold. LED lit => Level is above the set switching threshold. LED not lit => Level is below the set switching threshold. Thresholds can be raised or lowered by turning the relevant potentiometer (higher: clockwise, lower: anti-clockwise). Correlation between potentiometers and LEDs in test mode: a) Cut-out level Potentiometer S1 LED N1 (green) b) Base load level Potentiometer S2 LED P1 (red) c) Peak load level Potentiometer S3 LED P2 (red) d) Alarm level Potentiometer S4 LED AL (red) Exit the test mode by pressing the test button again or by interrupting the voltage supply. Example: 1. Press test button for approx. two seconds. Unit is in test mode now. 2. Adjust liquid level to required cut-out level. LED N1 lit: turn potentiometer S1 in clockwise direction until LED goes out. LED N1 not lit: turn potentiometer S1 in anti-clockwise direction until LED lights up. 8

9 3. Adjust liquid level to required base load level. LED P1 lit: turn potentiometer S2 in clockwise direction until LED goes out. LED P1 not lit: turn potentiometer S2 in anti-clockwise direction until LED lights up. 4. Adjust liquid level to required peak load level. LED P2 lit: turn potentiometer S3 in clockwise direction until LED goes out. LED P2 not lit: turn potentiometer S3 in anti-clockwise direction until LED lights up. 5. Adjust liquid level to required alarm level. LED AL lit: turn potentiometer S4 in clockwise direction until LED goes out. LED AL not lit: turn potentiometer S4 in anti-clockwise direction until LED lights up. 6. Press test button again to exit test mode. Caution Changing the factory-optimized switching points may lead to malfunctions and eventually cause system failure. To prevent personal injury and damage to property, switching points may be modified by KSB s customer service only DDEL and DSEL switchgear Switchgear types DDEL and DSEL work on the bubbler control principle. The pressure bell or bubbler tube must be suspended or mounted in the tank so that the submerged end is 100 mm above the tank floor. Caution Modifications to potentiometers and DIL switches are only necessary if factory settings are to be changed. Example: (Amarex S ) Start-up point high water 500 mm above tank floor Start-up point base load 400 mm above tank floor Start-up point peak load 500 mm above tank floor Cut-out point 200 mm above tank floor Bottom edge of pressure bell or bubbler tube 100 mm above tank floor Duplex pumping station max. permissible level (CK tank) Alarm ON, peak load ON, base load OFF => Default setting, peak load 400 mm => Default setting, base load 300 mm => Default setting, OFF 100 mm 9

10 above the lower bell edge at the electronic pressure switch useful switching difference without peak loads 400 mm above tank floor mm = 200 mm Fill tank up to 200 mm above tank floor or up to the pump s minimum water level (Amarex F = 280 mm). Set cut-out level of pressure switches as shown in table Continue to fill tank up to base load start-up point and set. Continue to fill tank up to peak load start-up point and set. Fill tank up to high water level and set. These operations are only required if factory settings need to be modified. They shall be performed by specialist personnel only. 6.4 Shutdown -- Set master switch to Set manual-0-automatic selector switch to Before opening the control cabinet and the motor terminal box, make sure to de-energize the system. -- Set motor protection switch to Before commencing any work in the control cabinet, use a voltmeter to verify that all phases are actually dead. 7 Returning to service (see Commissioning ) -- Set H-0-A selector switch to Compare the setting of the motor protection switch with the rated current of the motor and adjust, if necessary. -- Enable power supply. -- Verify the direction of rotation. To do so, set H-0-A selector switch to H (manual) only if liquid level is above start-up level! Make sure to comply with the operating manual of the respective pump. 8 Maintenance It is recommended to have the switchgear serviced once a year. EN stipulates that the operating reliability of sewage lifting units must be checked by the operator once a month by observing the lifting units for at least two switching cycles. Depending on sewage quality, the pressure bell shall be checked regularly and cleaned of deposits. During prolonged shutdown periods the switching points of pressure bells (open system) and measuring bells (closed system) may shift. As a precaution, we recommend to order the functional check option. The functional check ensures that the pump is started up for a short period at regular intervals. If a system is to be shut down for a prolonged period, the tank should be drained completely (= until the pump draws in air). 10

11 9 Trouble-shooting Pump not running Fault lamp lit Pump has started, but stops above cut--out level Fault lamp lights up after pump has started Pump does not stop Cause Remedy The pump pressure must be released before attempting to remedy faults on parts which are subjected to pressure. Disconnect the pump from the power supply! F H-0-A selector switch set to 0. Set switch to Automatic position. F Motor protection switch set to 0. Activate by setting switch to I. F Thermal circuit breakers not connected or not Connect; if not provided, connect bridge. provided. F Liquid level below start-up level. F No control voltage. Check control fuse, replace by spare fuse, if necessary. (Call in customer service to check after replacing a fuse) F No voltage in switchgear power cable Check. F Unit has been tripped by motor fuse. Replace fuse. (Call in customer service to check after replacing a fuse) F Motor protection switch set to 0. Activate by setting switch to I. F Thermal circuit breakers not connected or not provided. Connect; if not provided, connect bridge. F Unit has been tripped by thermal circuit breaker. Pump will re-start after cooling down. (If unit is repeatedly tripped by thermal circuit breaker, both pump and motor have to be checked mechanically and electrically by KSB s customer service!) F Wrong setting of motor protection switch. Set to rated motor (pump set) current. F Unit has been tripped by thermal circuit breaker. Pump will re-start after cooling down. (If unit is repeatedly tripped by thermal circuit breaker, both pump and motor have to be checked mechanically and electrically by KSB s customer service!) F Phase failure. Check power cable. F Incorrect pump selection. Contact customer service department. F Bubbler tube torn off, clogged or leaking. Check bubbler tube and connecting elements; replace, if ncessary. F High water caused by pump not running. See Pump not running If the problem cannot be remedied by these operations, call in KSB s customer service. Further investigations or switching point modifications may only be performed by KSB s customer service. This work must be performed by a qualified electrician or a duly trained, experienced person as described in DIN EN

12 10 Wiring diagrams 10.1 Connection diagram for DDEL with Amarex, 3 control wires (2x bimetal) Wire identification Power supply cable 3/N/PE 400 V AC, 50 Hz sw * = between bl and gn/ge Pump 1, 2x bimetal Pump 2, 2x bimetal 230 V AC, 50 Hz, e.g. for alarm switchgear AS 0, Imax = 4 A Volt--free signal, Fault at pump 1 Pump 1 running Fault at pump 2 Pump 2 running High water Potential equalization 10.2 Connection diagram for DDEL with Amarex, 4 control wires (1x bimetal, 1x PTC) Wire identification and Power supply cable 3/N/PE 400 V AC, 50 Hz sw * = between bl and gn/ge 1x bimetal (20+21) Pump 1 1x PTC (10+11) 1x bimetal (20+21) Pump 2 1x PTC (10+11) Volt--free signal, Fault at pump 1 Pump 1 running Fault at pump 1 Pump 2 running High water Potential equalization 12

13 10.3 Connection diagram for DSEL with Amarex 12-core pump cable, 4 control wires (1x bimetal, 1x PTC) and optional humidity sensor Wire identification and and 9 DDEL, DSEL Power supply cable 3/N/PE 400 V AC, 50 Hz sw * = between bl and gn/ge 1x bimetal (21+22) Pump 1 1x PTC (10+11) 1x humidity sensor (9) 1x bimetal (21+22) Pump 2 1x PTC (10+11) 1x humidity sensor (9) 230 V AC, 50 Hz, e.g. for alarm switchgear AS 0, Imax = 4 A Volt--free signal, Fault at pump 1 Pump 1 running Fault at pump 2 Pump 2 running High water Potential equalization 10.4 Connection diagram for DSEL with Amarex 7-core (power elements) and 5-core (control elements) pump cable, 4 control wires (1x bimetal, 1x PTC) and optional humidity sensor Wire identification 21 22, and 9 Power supply cable 3/N/PE 400 V AC, 50 Hz sw * = between bl and gn/ge Pump 1 Motor cable Pump 1 Control cable 1x bimetal (21+22) 1x PTC (10+11) 1x humidity sensor (9) Pump 2 Motor cable Pump 2 Control cable 1x bimetal (21+22) 1x PTC (10+11) 1x humidity sensor (9) 230 V AC, 50 Hz, e.g. for alarm switchgear AS 0, Imax = 4 A Volt--free signal, Fault at pump 1 Pump 1 running Fault at pump 2 Pump 2 running High water Potential equalization 13

14 11 Measurement pick-up Connecting the bubbler tube to the pressure bell (open system / bubbler system) 1. Slip PG cable gland (826), which will be required for fastening the pressure bell later, onto the bubbler tube (719.2) Then slip on union nut (920). 2. Use a knife or pipe cutter to cut the end of the bubbler tube at a 90_ angle (do not use diagonal cutting pliers). 3. Insert the bubbler tube into the tube connection (73-3.3) until it will not go any further. Firmly tighten the union nut (920). 4. Loosen the union nut at the switchgear end and slip it over the bubbler tube. Proceed in analogy with operations 2. and 3. Note: To ensure a leak-free connection, the bubbler tube shall be shortened by 1.0 cm whenever it is reassembled, before re-inserting it into the tube connection element. 14

15 12 Installation in tanks/sumps of any design (incl. CK and CB) Duplex pumping station Vent connection and cable entry Discharge outlet Inlet Alarm ON, peak load ON, base load OFF min. 200 mm (2) (1) Max. possible switching point for tanks/sumps of any design (2) For pumps with higher minimum water level, choose appropriate higher value 15

16 Correct routing of bubbler tube Incorrect routing of bubbler tube Avoid bends / Subject to technical modifications.