Suzhou MONARCH Control Technology Co., Ltd. NICE3000 New, User Manual, Page: 20 / 233

NICE3000
new
User Manual Safety Information and Precautions
- 19 -
cable and the cable connecting the controller and the motor produce leakage current, which
is much larger than the current when the motor runs at power frequency (50 Hz).
Thus, it is necessary to determine the proper RCCB sensitivity based on the general
leakage current of the cables and the motor. The leakage current is dependent on the motor
capacity, cable length, insulation class and wiring method. Generally, the leakage current on
the output side of the controller is three times of the current when the motor runs at power
frequency (50 Hz).
1.3 Protective Functions
Adopting different protective functions for different levels of faults, the NICE3000
new
provides
the elevator running system with full abnormality protection. For detailed solutions to the
faults, see chapter 8.
Faults of the controller are classified as follows:
1. Speed abnormal
The controller monitors the encoder feedback speed and output torque. Once the
feedback speed exceeds the limit or the deviation between the torque limit and the
speed feedback is too large, the controller performs protection immediately, reports an
alarm and prohibits running.
2. Drive control abnormal
The related faults include drive overcurrent, overvoltage/undervoltage, power input/
output phase loss, overload, and storage abnormality. If such a fault occurs, the
controller performs protection immediately, stops output, applies the brake and prohibits
running.
3. Encoder abnormal
The related faults include encoder phase loss, direction reversing, wire-breaking, and
pulse interference. If such a fault occurs, the controller performs protection immediately
to avoid unexpected accidents. If pulse interference is large, the controller reports
an alarm immediately. If pulse interference is small, the controller performs position
correction every time it receives a leveling signal and clears the accumulative error.
4. Leveling sensor abnormal
The related faults include sensor failure or sensor stuck. The controller judges whether a
fault occurs based on the leveling signal change. If the leveling signal does not change
within the set time, the system reports an alarm.
5. Floor data abnormal
The system stores the floor information through the shaft auto-tuning. If the floor data
is abnormal, the system prompts the fault information at the first-time running. During
actual running, the controller continuously compares position information input by DIs
with the stored floor data. If the deviation is large, the system reports an alarm.