26
PENTALIFT EQUIPMENT CORPORATION
M065R27
August 30, 2021 1:39 PM
ULTRAHOOK UHR40 VEHICLE RESTRAINT
MAINTENANCE MODE
The Ultrahook has a maintenance mode designed for use by trained service staff only. It allows the Ultrahook to be tilted,
extended or retracted independently. The service technician must open the control panel and locate the junction terminal
with the yellow tab labelled MS in its center. The tab is hinged and acts as a blade-style, normally-closed switch. Using a
small screw-driver or ballpoint pen, pull the tab out to place the unit in maintenance mode. Once the unit is in maintenance
mode, the functions are as follows:
Turning the 3-position selector switch to “
ENGAGE
”
extends
the restraint. (Spring tension will raise it)
Turning the 3-position selector switch to “
OVERRIDE
”
retracts
the restraint.
Pressing the “
RESET
” button
tilts
the restraint.
This allows the restraint to be moved for servicing or troubleshooting. Ensure that the unit is always put back into normal
operation before closing the control panel. To confi rm the PLC has been placed in run mode, check to ensure that both the
“Power” and “Run” lights on the PLC are illuminated.
1. If the restraint will not operate when the 3-position selector switch is turned to “ENGAGE”:
a) Confi rm the PLC is in run mode. Both the “Power” and “Run” lights on the PLC must be illuminated.
b) Confi rm that power is reaching the control panel. (E.g. circuit breakers, fuses engaged.)
c) Re-check all wiring and hydraulic connections.
d) Ensure proper hydraulic fl uid level.
e) Examine all moving parts for obstructions.
f) If the problem cannot be solved, consult your authorized Pentalift Representative.
NOTE: If the unit is in combination with a dock leveler, then both overloads will have to be reset.
2. If the motor runs but the restraint does not cycle properly:
a) Confi rm the PLC is in run mode. Both the “Power” and “Run” lights on the PLC must be illuminated.
b) Re-check all hydraulic connections.
c) Ensure proper hydraulic fl uid level.
d) Check for any obstructions and ensure the restraint can move freely.
e) Confi rm all proximity switch circuits against PLC inputs. Refer to the electrical schematic for a listing of PLC inputs
and outputs. The electrical schematic logic may be found inside the control panel.
f) If the problem cannot be solved, consult your authorized Pentalift representative.
3. If the main breaker or overload relay is tripping out.
a) Check for a short circuit in the wiring.
Three possible error conditions can occur during the operation of the Ultrahook:
A
The most common of these is the
failure to engage the truck rear impact guard
. This condition is detected by the activation of
a proximity switch when the hook reaches approximately 4” from the dock face during the retraction. See “OVERRIDE MODE”
WHEN THE REAR IMPACT GUARD CANNOT BE ENGAGED BY THE RESTRAINT on page 21.
B
If the
vehicle attempts to drive away while the restraint is still engaged
, see WHAT TO DO IF THE VEHICLE ATTEMPTS
TO DEPART WHEN RESTRAINED on page 21.
C
TIME OUT
errors occur when the desired operation takes too long to complete. If such an error occurs, check the operating
path (the area in which the Ultrahook moves) for debris or obstructions. Ensure that the power unit has oil and that all hose
fi ttings and connections are tight. Time out errors may also be caused by proximity switch failure. Confi rm all proximity switch
circuits against PLC inputs. Refer to the electrical schematic / ladder logic for a listing of PLC inputs and outputs. The electrical
schematic / ladder logic can be found inside the control panel.
