Model 820 Troubleshooting Guide

The table below provides guidance on identifying and correcting any problems with your Model 820 Series vehicle barrier. Please refer to the HPU O&M manual for more detailed troubleshooting guides referring to the pumping unit. If you encounter problems that you cannot fix, contact B&B ARMR and we will gladly work with you to correct them.

SymptomActions
Barrier does not raise up when commanded on control panel1. Check power.
2. Check overload protector.
3. Check PLC output on pumping unit.
4. Check that safeties are clear.
5. Check push button operation.
6. Check PLC input on pumping unit.
7. Check pressure gauge.
8. Manually raise the barrier by depressing the directional control valve to see if problem is mechanical or electrical.
9. Check for binding between moving plate and frame. Check connection of linkage between frame and plate. Check for debris.
Barrier does not close when commanded on control panel1. Check power.
2. Check PLC output on pumping unit,.
3. Check that safeties are clear.
4. Check push button operation.
5. Check PLC input on pumping unit.
6. Check for binding between moving plate and frame. Check connection of linkage between frame and plate. Check for debris.
HPU pump will not build up pressure but is running1. Check power.
2. Close pressure relief valve.
HPU pump will not turn on1. Check power.
2. Check motor overload, press start.
3. Check motor starter.
4. Check low level switch.
5. Check pressure switch.
Barrier makes noise during operation1. Check linkage between frame and plate. Be sure it is secured and properly lubricated (see maintenance check sheet).
2. Check hinge area for debris and proper lubrication (see maintenance check sheet).
3. Check hydraulic cylinder clevis pins for lubrication (see maintenance check sheet).
Hydraulic unit excessively hot1. Check that the pressure relief valve is closed (fully clockwise).
2. Check that the pressure switch is adjusted to shut the motor off before 1900 PSI
3. Check for correct voltages
Barrier moves too slowly1. Check for mechanical binds
2. Check flow control valve.
3. In extreme cold temperature, a higher grade hydraulic fluid may be required to keep viscosity constant.
Traffic indicator light does not change1. Check bulbs
2. Check PLC outputs
3. Check proper limit switch operation