Mount the panel on a rigid vertical support, low enough for the 1/2" air line from the compressor to slope down to the air reservoir. This permits moisture to drain to the reservoir where it can be automatically ejected by the moisture valve.
Pipe and wire the panel into the system per applicable connection diagrams.
After the brake system is completely piped and wired, turn power ON. Check preset air pressures:
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- Compressor supply pressure at gauge A must range from 75-90 psi. This pressure is controlled by 1PS N.C. pressure switch.
- Emergency pressure step (ON when ESV solenoid valve is deenergized) is factory set at 40 psi by regulator in front of gauge B.
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- Abnormally low compressor supply pressure is signalled by 2PS N.O. pressure switch, which must close on 60 psi increasing pressure and open on 50 psi decreasing pressure.
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SPECIAL BLEEDING AND PRESSURE ADJUSTMENT INSTRUCTIONS
FOR A/HM-ERC SYSTEM |
- Fill fluid reservoir/bleeder(s) (and control cylinder and pilot circuit reservoir if used). Bleed the service brake circuit by holding BPB service brake bleeder pushbutton in and stroking the service brake pressure cluster(s) by repeatedly pushing BFP brake filling pushbutton.
Bleed the parking brake circuit by holding BPB parking brake bleeder pushbutton in and stroking the parking brake pressure cluster(s) by repeatedly opening the bleeder screw on the HRC valve and pumping the control cylinder until clear fluid escapes from the bleeder screw. Close bleeder screw.
If HRC circuit includes coiled or looped hose, move trolley to cause straightest possible hose length when bleeding system.
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- After the brake system is bled and brakes are adjusted, operate brake system. The low step pressure should control the empty crane to a slow stop. The high step pressure should control the loaded crane to a quick stop without abnormal load swing. Either pressure steps may be reset in the field; however, low pressure step must be less than the high pressure step. If HRC circuit is used, operation should be precise without noticeable time delay.
Note: 20 seconds after high pressure step application, the protection valve control pressure is reduced, causing the valve to exhaust parking brake release pressure. Parking brakes are spring applied. High pressure step is then exhausted from the service brake pressure cluster(s).
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AC WIRING DIAGRAM
TYPE A/HM-ERC AIR/HYDRAULIC
PREWIRED CONTROL PANEL |
DC WIRING DIAGRAM
TYPE A/HM-ERC AIR/HYDRAULIC
PREWIRED CONTROL PANEL |
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| Note: Standard AC Panels Are Designed For 460V Operation. |
1PS - N.C. Compressor Start-Stop Pressure Switch (80/65 PSI)
2PS - N.O. System Pressure Switch (60/50 PSI)
BPB - Bleeder Pushbutton
BFP - Service Brake Filling Pushbutton
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