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INSTALLATION INSTRUCTIONS Type A/H-ERC Panel, Large (33" Wide x 45" High)

THESE INSTRUCTIONS COVER INSTALLATION OF THE FOLLOWING PANEL ASSEMBLIES: Power Supply 380, 460 or 575V, 50/60 Hz AC 230VDC Pressure Cluster Air Hydraulic Ratio 8 x 1 5 x 1 8 x 1 5 x 1 No. of Pressure Clusters 1 2 J70980 J70982 J70981 J70983 J70984 J70986 J70985 J70987

A/H-ERC LARGE PANEL PIPING DIAGRAM

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:
Compressor supply pressure at gauge A must range from 65-80 psi. This pressure is controlled by 1PS N.C. pressure switch.   Low pressure step (ON when SSV solenoid valve is energized) is factory set at 30 psi by regulator at gauge B. This may be reset in field. See "Pressure Adjustment Instructions" below.	High pressure step (ON when ESV solenoid valve is deenergized) is factory set at 40 psi by regulator in front of gauge C. This may be reset in field. See "Pressure Adjustment Instructions" below.   Abnormal 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.
SPECIAL BLEEDING AND PRESSURE ADJUSTMENT INSTRUCTIONS FOR A/H-ERC SYSTEM
Fill fluid reservoir/bleeder and pressure cluster. Bleed the ERC brake circuit by holding BPB bleeder pushbutton in and stroking pressure cluster by repeatedly pushing BFP brake filling pushbutton.   After the brake system is bled and brakes are adjusted, operate system to check performance. 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 field; however, low pressure step must be less than the high pressure step.   Note:  Power failure or power shutdown causes high pressure step to apply but initiates slow air pressure bleed-down, which causes complete brake release after 1-2 hours.
AC WIRING DIAGRAM TYPE A/H-ERC AIR/HYDRAULIC PREWIRED CONTROL PANEL	DC WIRING DIAGRAM TYPE A/H-ERC AIR/HYDRAULIC PREWIRED CONTROL PANEL
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