Emotron EMX-B, Инструкция по эксплуатации

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26 Built-in functions
CG Drives & Automation 01-6048-01r3
3.4 Protection of the control unit
The control unit is monitored for both over-voltage and under voltage. If the
supply voltage goes over or under the allowed limits, an alarm is triggered and
the motor stops. The motor starts again automatically when the supply voltage
returns to its normal value. The alarm is automatically reset.
The control unit has built-in motor protection that protects against overloading
and external motor protection shall not be used. Power supply to the motor is
cut in the event of overload. In order to reset the alarm, when Modbus is not
used, the supply voltage to the control unit must be temporarily disconnected
for at least 30 seconds to let stored voltage discharge. Reset is also possible by
shorten the terminals see Table 4, page 18.
Built-in short circuit protection protects against short circuits between the
phases of the motor and between the phases and earth. If this fault is
continuously detected can it only be reset by power cycling.
Table 5 Protection and alarm functions
*) Possible to reset via Modbus or shorten the terminals 33, 34 and 35 when
Modbus is Off.
Protective
function
External alarm
with alarm relay
Restart Alarm reset
Supply fault,
overvoltage
Yes, immediately Automatic Automatic
Supply fault,
undervoltage
Motor
protection/
overload
Yes, immediately
Manual reset, disconnect and reconnect
power supply.*
Short circuit/
earth fault
Manual reset, disconnect and reconnect
power supply.*
Internal Rotation
monitor
Yes, immediately Motor not stopped
Manual reset,
disconnect and
reconnect power
supply.*
External rotation
monitor
Yes, immediately Motor not stopped
Manual reset,
disconnect and
reconnect power
supply.*