Troubleshooting 2200 YRM 1067
Dash Display
Controller LED Handset or PC
AL5 5 Flashes EB DRIVER KO
CONDITION
Electric brake does not release or remains
released at all times.
TRUCK RESPONSE
Traction and hydraulic functions disabled.
POSSIBLE CAUSES AND TEST PROCEDURES
• Damaged or loose electrical connection to brake.
Verify electrical connection between electric brake
and controller.
• Check brake coil for correct coil resistance.
Disconnect brake. Measure brake coil resistance in
both directions. Coil resistance should be between
28-32 ohms.
• Damaged fly-back diode at brake.
Check coil resistance. Short circuit measured at
brake connector may indicate a damaged diode.
Cut one lead of diode and check with meter. If dam-
aged, replace diode.
• Damaged controller.
Activate the brake switch. Use voltmeter to mea-
sure voltage on wire 2C and 17 with brake con-
nected in circuit. If both measurements are 24V and
the alarm is displayed, then controller is damaged.
LOGIC
Occurs when brake driver
circuit is shorted or open circuit.
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