DoorHan DCUH-2 Manual del usuario - Página 11
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7. CONTROL UNIT OPERATION
7.1. TO RAISE THE LEVELER
1. Park the transport vehicle with an open body in front
of the leveler so that it is positioned squarely against
dock bumpers.
2. Chock the vehicle wheels to prevent accidental depar-
ture.
3. Turn the main power switch ON to operate the leveler.
WARNING!
Keep the main power switch ON till the leveler stops working and returns to the stored position!
7.2. TO STORE THE LEVELER
When loading or unloading is finished resume the
stored position of the dock leveler by pressing and
holding the RAISE button until the lip folds vertically
downwards. Then release the RAISE button and wait
till the leveler returns to the stored position. After that
turn the main power switch 0FF.
7.3. EMERGENCY STOP
Should any emergency arise halt the dock leveler in place by turning the main power switch OFF.
WARNING!
To resume operations turn the main power switch ON and press RAISE button shortly.
8. TROUBLESHOOTING
Table 8.1. Possible faults, their causes and solutions
Symptom
Leveler does not
rise (pump does not
rotate)
Leveler does not
rise (pump rotates)
Leveler does not lower
Possible cause
No supply voltage
Faulty power switch
Blown fuse
Faulty contactor
No power to the contactor coil
No jumper on terminals
for safety devices
Lip inductive position sensor or photoelectric sensor is
open
Faulty control buttons
Incorrect phasing
No power to the electromagnetic valve coil
Faulty electromagnetic valve coil or valve
4. Make sure the power led on the control unit is lit, then
press the RAISE button.
5. Keep the RAISE button pressed until the leveler deck
is fully raised and the lip is extended. Then release the
button and wait till the leveler deck lowers on the ve-
hicle bed. The lip should have a minimum of 100 mm
overlap on the vehicle bed surface.
parking of the leveler:
Auto
Press the P button briefly. Wait till the dock leveler re-
sumes the stored position. After that turn the main power
switch 0FF.
Check the electrical wires
and the voltage in the socket
Replace main power switch
Swap any two phases in the control unit
Check wiring from control unit to coil.
Check coil voltage (24 VDC)
Solution
Replace fuse (FU)
Replace main board
Replace main board
Set the jumpers to
Х15, Х16, Х17, Х18
Check both sensors
Replace control board
Replace main board
Replace coil or valve
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