VMC - Hydraulic Counterbalance - Pressure Switch - Replacement

Size: px

Start display at page:

Download "VMC - Hydraulic Counterbalance - Pressure Switch - Replacement"

Doreen Adams
5 years ago
Views:

Haas Technical Documentation VMC - Hydraulic Counterbalance - Pressure Switch - Replacement AD0331 Rev A

document Translation Available VMC - Hydraulic Counterbalance - Pressure Switch - Replacement -

Replace the pressure switch on the tank for a hydraulic counterbalance.

1 Haas Technical Documentation VMC - Hydraulic Counterbalance - Pressure Switch - Replacement AD0331 Rev A Applies to machines built from: May, 1995 to May, 2012 Scan code to get the latest version of this document Translation Available VMC - Hydraulic Counterbalance - Pressure Switch - Replacement - Introduction This procedure tells you how to do these tasks: Release the nitrogen gas from the tank. Replace the pressure switch on the tank for a hydraulic counterbalance. Fill the tank with nitrogen gas to the correct pressure. Copyright 2018 by Haas Automation, Inc. No unauthorized reproduction Last Published On August 06, /5

2 Caution: When you do maintenance or repair on CNC machines and their components, you must always follow basic safety precautions. This decreases the risk of injury and mechanical damage. Do these steps before you do work in the machine or in the control cabinet: Set the main circuit breaker to the [OFF] position. Use an approved lock with an approved safety tag. Always follow lock-out procedures in accordance to local government rules. After turning off the machine, wait at least 5 minutes before working in the control cabinet, to allow power to dissipate. Wait for the voltage indicator LED on the vector drive to go off completely. Always turn off the main air supply when you work on any part of the pneumatic system. Make sure to rest the spindle head on a block of wood when work is done on a vertical axis. This will prevent any unintended movement that could result in the axis falling. Never alter any safety circuits on the machine. Never change any parameter while in DEBUG mode (Classic Haas Control) and the servos ON. Put the machine in Emergency Stop mode to change any parameters. Never operate the machine in DEBUG mode (Classic Haas Control). You should not do machine repair or service procedures unless you are qualified and knowledgeable about the processes. Serious damage to the machine components can result in costly repairs. The service technicians at your Haas Factory Outlet (HFO) have the training and experience, and are certified to do these tasks safely and correctly. The repair and service work performed by your HFO is protected with a limited warranty. Danger: Some service procedures can be dangerous or life-threatening. DO NOT attempt a procedure that you do not fully understand. If you have any doubts about doing a procedure contact your Haas Factory Outlet (HFO) and schedule a service visit. Prerequisites This procedure applies to many parts. You need only (1) of the switches listed under Parts Included to complete this procedure. Machine Compatibility Do this procedure on VF-series machines that have a hydraulic counterbalance system. Document Applies to these Parts [A] B QTY: 1 SWITCH, PRESSURE 900 PSI [A] B QTY: 1 SWITCH, PRESSURE 750 PSI [A] B QTY: 1 SWITCH, PRESSURE 600 PSI [A] B QTY: 1 SWITCH, PRESSURE 1000 PSI [A] B QTY: 1 SWITCH, PRESSURE 450 PSI [A] B QTY: 1 SWITCH, PRESSURE 1400 PSI [A] QTY: 1 SWITCH, PRESSURE 1000 PSI (S0LID STATE) Copyright 2018 by Haas Automation, Inc. No unauthorized reproduction Last Published On August 06, /5

3 Tools Required Charge/Discharge Kit, (P/N A) Regulated dry nitrogen tank, 250 cu ft (7079 liters). The gas supply must have a right-hand thread, CGA 580 ( NGO-RH-INT) fitting. Welding grade gas is acceptable. VMC - Hydraulic Counterbalance - Pressure Switch Replacement STEP 1 Jog the spindle head to 14.5" (36.8 cm) above the table. Put a wood block on the table. Lower the spindle-head casting onto it. Caution: Do not let the spindle touch the block. This causes damage to the spindle. Push [POWER OFF]. Set the main circuit breaker to the OFF position. Lock the main circuit breaker. Use an approved lock with an approved safety tag. STEP 2 Disconnect the two-pin end of the pressure switch cable [1] from the pressure switch. Warning: Before you do this step, put on eye protection. Do not disconnect the hose [2] to the hydraulic cylinder. Remove the tank from the machine. Do not twist the hose [2] for the hydraulic cylinder. Put the tank vertically on the ground. Remove the cap [3] from the Schrader filler valve. Note: If your system has a two-end tank system, a second Schrader valve is at the bottom of the tank. Remove the cap from the top valve. Turn the T-handle fully counterlockwise on the gas chuck [4] attached to the "Charge/Discharge-Kit" (P/N A). With your fingers, tighten the nut on the gas chuck onto the Schrader valve. Put the other end of the hose into a bucket. Slowly turn the T-handle clockwise until the system starts to release the nitrogen gas. The time for this to complete is 10 minutes or less. Make sure the pressure gauge shows 0 psi. Turn the T-handle fully counterclockwise and remove the gas chuck [4] from the Schrader valve. Copyright 2018 by Haas Automation, Inc. No unauthorized reproduction Last Published On August 06, /5

4 STEP 3 Remove the used pressure switch. Install the PRESSURE SWITCH ASSY 1400PS [A]. Use a wrench to tighten the switch. Warning: Before you do this step, put on eye protection. With your fingers, tighten the nut on the gas chuck [1] attached to the Schrader valve. Note: Make sure you turn the T-handle of the gas chuck fully counterclockwise. Note: If your system has a double-ended tank system, a second Schrader valve is at the bottom of the tank. Use the top valve. Attach the other end of the hose to the source pressure [2]. Slowly open the valve on the source pressure while you monitor the pressure gauge. Open the valve slowly at the start to protect the seals in the Schrader valve. STEP 4 Pressurize the system to the correct psi (bar). For the correct value, refer to the chart at the end of this procedure. Install the tank into the machine. Push [ZERO RETURN]. Push [Z]. Examine the tank and hoses for leaks or unusual noises. Make sure the tank pressure is correct at the top of travel. Add nitrogen if necessary. Remove the "Charge/Discharge-Kit" (P/N A). Replace the valve cap. Copyright 2018 by Haas Automation, Inc. No unauthorized reproduction Last Published On August 06, /5

5 Counterbalance Pressure Chart This chart shows the correct pressures for the counterbalance tank. Measure the pressure at the top of Z-Axis travel for VMCs and at the top of Y-Axis travel for HMCs. Pressure that is 50 psi (3 bar) higher than the value in the chart is permitted. But pressure that is lower than the value in the chart is not permitted. Model Made After Pressure Made After Pressure Made After Pressure - - PSI BAR - PSI BAR - PSI BAR EC-1600/2000/3000 3/15/ /13/ /14/ EC-630 3/21/ HS-1 10/30/ HS-3/4/7 6/5/ /18/ /29/ VB-1 6/5/ VF-3/4 (VCE 1000/1250) 4/28/ VF-5 XRT 10/8/ VF-5, VM-3, VF-3YT (VCE 1300) 7/21/ /14/ VF-5/50, VF-3YT/50 (VCE 1300) 7/21/ VF-6/7/10/12-50 (VCE 1600, 2000, 3000) 10/30/ VF-6/7/10/12 (VCE 1600, 2000, 3000) 10/30/ VF-8/9/11-50 (VCE 1600, 2000, 3000) 7/21/ VF-8/9/11 (VCE 1600W, 2000W, 3000W) 10/30/ VF-O/OE/EXT/1/2 (VCE 475/500/550/700/750) 4/28/ VR-8/9/11 10/30/ /21/ /14/ VS-1/2/3 2/29/ VTC 5/4/ Copyright 2018 by Haas Automation, Inc. No unauthorized reproduction Last Published On August 06, /5

2 GALLON TWIN STACK AIR COMPRESSOR W/ HOSE REEL

2 GALLON TWIN STACK AIR COMPRESSOR W/ HOSE REEL Model: 52024 CALIFORNIA PROPOSITION 65 WARNING: You can create dust when you cut, sand, drill or grind materials such as wood, paint, metal, concrete, cement,