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6-26 Manual # 42-02-2223
Troubleshooting
Down Normal Terminal ’n’ Level 1 Speed Fault, DN NTS’n’ L1 SPEED FLT (n = 1 to 5)
Description: Level 1 Overspeed fault at Down Normal Terminal switch ‘n’ (1 to 5). When switch opened, car
traveling faster than defined by level 1 overspeed settings (sum of learned speed plus Overspeed 1 Margin
percentage on Configuration > Terminal Switches tab) but not fast enough to trigger Level 2 overspeed fault.
This fault may be bypassed on the Diagnostics > Fault Bypass tab.
Car Reaction: Controlled stop using Emergency Slowdown pattern parameters.
Troubleshooting:
1. On Diagnostics > Terminal Switches Status tab, compare last pass and Learned speeds for switch. If
appropriate, increase Overspeed 1 Margin on Configuration > Terminal Switches tab.
2. May be caused by change in Pattern parameters. Re-learn terminal switches after pattern changes.
3. Short runs can come in “hotter” than multi-floor runs. (Switches are learned making full hatch runs.) If
short runs cause this, increase Overspeed 1 Margin or lower Standard profile - High Roll Jerk parameter.
4. If caused by poor pattern following due to heavy load or poor speed loop performance, adjust speed loop
to follow pattern as well as possible and/or alter pattern for gentler deceleration and approach to floor
(re-learn switches).
Please refer to “Terminal Switch Overspeed and Position Faults” on page 4-54 .
Down Normal Terminal ’n’ Level 2 Speed Fault, DN NTS’n’ L2 SPEED FLT (n = 1 to 5)
Description: Level 2 Overspeed fault at Down Normal Terminal switch ‘n’ (1 to 5). When switch opened, car
traveling faster than defined by Level 2 overspeed settings (105% of sum of learned speed plus Overspeed 1
Margin percentage setting on Configuration > Terminal Switches tab). Fault may be bypassed on Diagnostics
> Fault Bypass tab.
Car Reaction: Emergency stop: Motor contactor and brake contactor immediately dropped.
Troubleshooting:
1. On Diagnostics > Terminal Switches Status tab, compare Last pass and Learn speeds for switch. If
appropriate, increase Overspeed 1 Margin on Configuration > Terminal Switches tab.
2. If caused by pattern parameter change, re-learn terminal switches.
3. Short runs can come in “hotter” than multi-floor runs. (Switches learned making full hatch runs.) If short
runs cause this, increase Overspeed 1 Margin or lower Standard profile - High Roll Jerk parameter.
4. If caused by poor pattern following due to heavy load or poor speed loop performance, adjust speed loop
to follow better and/or alter pattern parameters for gentler deceleration and approach. Re-learn
switches.
Please refer to “Terminal Switch Overspeed and Position Faults” on page 4-54.
Down Normal Terminal ’n’ Position Fault, DN NTS’n’ POSITION FLT (n = 1 to 5)
Description: When switch opened or closed, car reported position different from learned position by amount
exceeding margin on Configuration > Terminal Switches tab. May mean switch opened early, late or not at all
on approach. May mean switch closed early, late, or not at all on departure. Switch can go open while stand-
ing at a floor where learned position is closed, or go closed at a floor where learned position is open. May
bypass fault on the Diagnostics > Fault Bypass tab.
Car Reaction: If traveling down, car executes emergency slowdown, then continues at low speed until it
encounters a floor. Car stops at floor, opens doors, and performs a floor sync. If fault persists, car goes out of
service. If traveling up, car continues normally to first stop, opens doors and performs floor sync. If fault per-
sists, car goes out of service. If stopped at floor, car opens doors, does a floor sync, and, if fault persists,
takes itself out of service.
Troubleshooting:
1. On Diagnostics > Terminal Switches Status tab, compare Last pass position to Learned position.
2. If mechanical (switch movement, magnet movement), will tend to repeat at same position every time.
3. Spot a stuck switch by running car on inspection and observing input LEDs on iBox.
4. Perform a Terminal Sync operation (Terminal button on the Configuration > Pattern > Common tab).
Drive At-Speed Fault, DRIVE AT-SPEED FAULT
Description: Detected by drive, motor speed outside threshold limits defined by drive parameter.
Car Reaction: Emergency stop: Motor contactor and brake contactor immediately dropped.
Troubleshooting:
1. Should not occur with AC Drive. Fault wired physically OFF. If fault occurs, it is a hardware problem.
Table 6.3 iControl Messages
iControl Messages