NEXUS STATION | TECHNICAL OPERATIONS AND MAINTENANCE GUIDE APR/2017
87 INSTRUCTIONS FOR TROUBLESHOOTING COMMON COMPONENT ERRORS | BRAKE ERRORS
Brake errors
Brake errors can be caused by a malfunctioning of the motor or any of the components that comprise the
brake assembly, including the brake strap, belt loop sheet, and hose clamps.
Brake failed to apply
Fixing brake errors may require adjustments to the brake assembly and its connected parts, most commonly
the strap. Review the instructions for installing the brake assembly if necessary to verify that the brake com-
ponents are properly in place. See “Coupler tube and brake motor (brake actuator assembly)” on page 40.
No. Error Description
4208 Brake failed to apply The brake actuator has failed to engage as expected to slow down the
descent of any incoming carrier. When this error occurs, the user may hear
a loud arrival sound at the station as the carrier hits the slide plate.
4210 Brake over-current The brake motor is drawing current over the specified threshold. These
advisories are not uncommon. If they become frequent, the brake motor
may be stressed and may require replacement.
TABLE 7. Troubleshoot Nexus Station brake errors
Action | component Details | expected condition | next steps
1 Inspect power harness PCB connection. J37/P37
2 Observe LED signal indicators D36, D37
3 Visually inspect the brake strap. Strap is taut and properly attached and aligned at the brake
controller.
If the strap is broken or visibly frayed, replace it.
If the strap is loose, unattached our out of alignment at
the controller, reattach it. Then follow the instructions
to recalibrate it. See “Calibrate the brake” on page 43
.
4 Visually inspect the hose clamps, screws on
brake controller, belt-loop sheet, other brake
components
Refer to the instructions for installing the brake,
and verify that the assembly and all of its parts
are properly connected and aligned.
All brake assembly parts are in place as expected.
Tighten any bolts that appear to be loose, and re-align
the belt-loop sheet if necessary.
Then follow the instructions to recalibrate it. See “Cali-
brate the brake” on page 43.
5Open the Station Diagnostics menu at the con-
trol panel.
Tap Open and then Close for the brake while
observing its movement.
Brake opens and closes as expected. D22 and D23 indicators
alternate flashing as the door moves up and down. D20 and
D21 are lighted to indicate that the signal is being received
at the I/O board.
If the brake moves as expected, cycle the station power,
and verify that the brake resets as expected upon
restart.
If the brake does not open and close as expected, check
the indicators as you attempt to manipulate the door.
If the motor indicators do not light, the motor may
require replacement.
If the signal indicators either fail to light or if they
remain lighted while movement is not being attempted,
the signal driver may have failed. In case of a driver fail-
ure, replace the I/O board
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