20
RITE-HITE VBR-300 DOK-LOK Owner’s Manual
Troubleshooting
General Diagnostic Information
Problem
Probable Cause
Solution
1
DOK-LOK
barrier does not raise and
lights do not flash.
Power source malfunction.
Check power source including building
circuit breaker, 1A fuse and 5A fuse on
power module.
Power module failure.
Verify the appropriate motor output LED is
lit when the LOCK button or UNLOCK
button is pressed.
Incorrect wiring.
Verify wiring per
Electrical Schematic
(Standard)
,
Figure 14, page 13
and
Electrical Schematic (Optional)
,
Figure 15,
page 14
.
2
DOK-LOK
lights are flashing, but
barrier does not raise/lower, to full
extent.
Blown fuse.
Check 5A fuse on power module. Replace
as required.
Low incoming voltage.
Verify incoming voltage at L1 and L2 is a
minimum of 110V. Do not power off a
control transformer from other equipment
unless properly sized for load.
Power module failure.
Verify the appropriate LED is lit when the
LOCK button or UNLOCK button is
pressed.
No push button inputs.
Check for defective push button board or
ribbon cable.
Hydraulic power unit defective.
Check hydraulic power unit,
Figure 23,
page 21
. Repair or replace as required.
Leak in hydraulic circuit.
Check all hydraulic hose and fittings for
leaks. Inspect lift cylinder for excessive oil.
Debris in roller track/base.
Clean debris from roller track and base.
Incorrect wiring.
Verify wiring per
Electrical Schematic
(Standard)
,
Figure 14, page 13
and
Electrical Schematic (Optional)
,
Figure 15,
page 14
.
3
DOK-LOK
vehicle restraint is
operational but barrier drops causing
lights to change and/or horn to sound
while trailer is being serviced.
Leak in hydraulic circuit.
Check all hydraulic hose and fittings for
leaks. Inspect lift cylinder for excessive oil.
Air in hydraulic system.
Cycle barrier up and down to purge
hydraulic system of excess air.
4
DOK-LOK
barrier is operational but all
lights are out.
Bulbs burnt out, loose or missing.
Check all bulbs and replace as required.
Damaged CPU module.
If the ISG and OSR LEDs are not flashing
while in the LOCKED position or the ISR
and OSG LEDs are not flashing while in
the UNLOCKED position, replace the CPU
module as required.
Incorrect wiring.
Verify wiring per
Electrical Schematic
(Standard)
,
Figure 14, page 13
and
Electrical Schematic (Optional)
,
Figure 15,
page 14
.
