Poweramp POWERHOOK SERIES - Manual (Page 48)

TROUBLESHOOTING DOCK LEVELER
4111-0010 — Nov 2010 46
This is for standard Powerhooks only.
This is for Powerhooks that have a Telemecanique “Twido” computer (PLC) only.
This is for Powerhooks that have the new style valving only. Powerhooks with
new style valving do not have any solenoid valves in the hydraulic valve block
that is on the hook cylinder (Powerhooks with old style valving have 2 solenoid
valves in the hydraulic block that is on the hook cylinder).
!! WARNING !!
Risk Of Electric Shock That Could Result In
Severe Personnel Injury Or Death
Before disconnecting and/or connecting any wires inside the control
panel, turn off all power entering the control panel at the disconnect
switch(es). Some units may require 2 disconnect switches to be turned
off before all power entering the control panel is turned off. The POWER,
OFF-ON selector switch on the control panel is NOT a disconnect switch.
The solenoids are originally connected as follows:
Solenoid Field Wire Number Computer Terminal
A 60 Output 0
B 61 Output 1
C1, C2 62 Output 2
D 63 Output 3
For any of the following troubleshooting steps to work the solenoids need to be
working correctly and the motor needs to be pumping fluid.
To force the Hook out (extend), do the following:
1. Set the dock leveler on the maintenance prop.
2. Turn off the disconnect switch(es) – see WARNING above.
3. Disconnect field wires 60, 61, 62 and 63. Cap off the end of each wire with a
wire nut.
4. Turn on the disconnect switch(es).
5. Set the POWER, OFF-ON switch to ON.
6. Set the OPERATION SWITCH to BYPASS.
7. Push and hold the RAISE pushbutton. Release the RAISE pushbutton when
the Hook is extended to the desired position.
8. Turn off the disconnect switch(es) – see WARNING above.
9. Reconnect field wires 60 through 63 as originally connected.