Hydraulic Counterbalance - Troubleshooting Guide

Size: px

Start display at page:

Download "Hydraulic Counterbalance - Troubleshooting Guide"

Gavin Scott
5 years ago
Views:

LAST UPDATED: 11/26/2018 Components 1. Hydraulic Tank: mounted upside-down on the column of the machine. It holds the hydraulic oil and pressurized nitrogen. 2.

1 LAST UPDATED: 11/26/2018 Components 1. Hydraulic Tank: mounted upside-down on the column of the machine. It holds the hydraulic oil and pressurized nitrogen. 2. Hydraulic Cylinder: relieves vertical force from the spindle head on the verticle axis servo motor. 3. Pressure Gauge: shows the system pressure. 4. Hose Outlet: connection point for the hydraulic hose. The other end connects to the 90 fitting [8] on the hydraulic cylinder. 5. Pressure Manifold: connected to the hydraulic tank. 6. Pressure Switch: tells the control when the pressure is low. 7. Schrader Valve: allows you to add or remove pressure Fitting: connection point for the hydraulic hose. The other end connects to the hose outlet [4] on the tank. 9. Threaded Rod End: connects to the spindle head bracket. Page 1 of 5 pages

2 System Pressure Chart Page 2 of 5 pages

3 MODEL PSI BAR PSI BAR PSI BAR EC-1600/2000/3000 3/15/ /13/ /14/ EC-630 3/21/ HS 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) /14/ VF-5/50, VF-3YT/50 (VCE 1300) VF-6/7/10/12-50 (VCE 1600, 2000, 3000) VF-6/7/10/12 (VCE 1600, 2000, 3000) VF-8/9/11-50 (VCE 1600, 2000, 3000) VF-8/9/11 (VCE 1600W, 2000W, 3000W) VF-O/OE/EXT/1/2 (VCE 475/ 500/550/700/750) 4/28/ 1995 VR-8/9/ /14/ VS-1/2/3 2/29/ VTC 5/4/ All pressures should be at the top of travel (+50, -0 psi) (+3, -0 bar) Page 3 of 5 pages

4 Symptom Table SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION Alarm 107 EMERGENCY STOP There is low nitrogen pressure in the conterbalance system. Check for leaks on the cylinder and rech Alarm 820 COUNTER BALANCE FAILURE The pressure switch circuit does not operate correctly. Troubleshoot the wiring and switches. The spindle head drops There is low nitrogen pressure in the conterbalance system. Check for leaks on top of the counterbal with [EMERGENCY STOP] on. There is low oil level in the counterbalance system. Check for an oil leak on the cylinder. The cylinder leaks oil. There is contamination in the oil. The hydraulic cylinder is misaligned. Check for the cause of contamination. Check for the cause of the leak. Nitrogen Pressure Check for leaks on the top of the cylinder. If there is no leak, recharge the nitrogen: Remove the cap [1] from the Shrader valve. Connect the Charge / Discharge kit (P/N A) [2] to the Shrader valve [3]. Use the "System Pressure" chart at the beginning of the document for the correct pressure. If the cylinder leaks oil: Go to Section 3. Page 4 of 5 pages

Pressure Switch Disconnect the pressure switch cable [1] from the pressure switch [2]. Make sure that there is no contamination on the connectors. Use a jumper to connect the pins on the cable.

5 Pressure Switch Disconnect the pressure switch cable [1] from the pressure switch [2]. Make sure that there is no contamination on the connectors. Use a jumper to connect the pins on the cable. If the alarm resets, the pressure switch is at fault. Refer the VMC - HYDRAULIC COUNTERBALANCE - SWITCH - REPLACEMENT procedure. If the alarm does not reset jump at the I/O board. If the alarm resets replace the pressure switch cable [1]. If the alarm does not reset refer to the CHC - I/ O PCB - TROUBLESHOOTING GUIDE. Oil Leaks Any leak in the hydraulic counterbalance system means the system is damaged [1], and must be replaced. Both the hydraulic cylinder and the hydraulic tank must be replaced together to avoid oil contamination. For replacement instructions, refer to the document VMC - HYDRAULIC COUNTERBALANCE - REPLACEMENT. The replacement instructions include information on how to correctly align the cylinders. The new cylinder(s) must be correctly aligned to avoid damaging the new system and cause another leak. Page 5 of 5 pages

VMC - Hydraulic Counterbalance - Replacement

Haas Technical Documentation VMC - Hydraulic Counterbalance - Replacement AD0289 Rev G Applies to machines built from: May, 1995 to May, 2012 Scan code to get the latest version of this document Translation