Poweramp POWERHOLD 4.2009 - Manual (Page 35)

TROUBLE SHOOTING POWERHOLD
Symptom Possible Cause Solution
Restraint raises makes
contact with ICC bar but
does not lock. Then
returns to stored
position. Improper location of P-Hold Power Hold must have a 4” set back from bumper
SEE page 10.
Prox switch 1. Check prox switch #1 and #2. When metal is
placed in front of prox the led light on the prox
will light up. When the led on the prox is lit the
inputs#3 and #4 on the plc will also be lit.
-Shorted or open prox switch
-open or shorted wires
-Bad prox switch.
Activation of #1 prox switch Input 4 must come on first. The restraint shoe must
make contact with the ICC bar. The restraint shoe
will rotate as the hydraulic extends. The Slide block
on the hydraulic cylinder push The rod. The rod will
make contact with the Z bar. The Z bar will pass
over the #1 prox switch. Input #3 will light on the
PLC. The power hold then shut off.
-Frozen or rusted push rod
-Bend or damaged Z bar
-adjustment to prox maybe required
Activation of #2 prox switch The restraint shoe must make contact with the ICC
bar. The restraint shoe will rotate the ratchet will
pass in front of the #2 prox switch, input #4
Platform does not rise.
Pump operates in
pressure relief mode.
Heavy object(s) on platform. Remove object(s) from platform.
NOTE: For safety reasons, the dock leveler is
designed to lift only the platform’s own
weight.
Dock leveler binds. Check for visible obstructions that could cause
binding. Remove obstructions. If no obstructions
found, call Poweramp Technical Services. See inside
back cover for phone number and address.
Pressure relief set too low. Increase pressure relief. See Adjust Main Pressure
Relief in the Adjustment section.
NOTE: The pressure relief valve must not be set at a
level that causes the motor operating current
to exceed the full load amp value* at any
time, including when operating in pressure
relief.
* The full load amp value can be found on the inside cover of the
control panel.
4111-0016 — November, 2008 33