Protection Of The Control Unit - Emotron EMX- R Betriebsanleitung

means the built-in electronic rotation monitor RotoSens is connected.
• DIP switch 4 in position "ON"(uppwards), means rotation monitor uses an
external rotation sensor.
• No rotation monitoring, DIP-switch 4 also must be set in position "OFF",
and a jumper must be fitted between terminals 31 and 32 ("oF" is now indi-
cated in the display on Model E).
1.3.3

Protection of the control unit

The control unit is protected by monitoring 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 is not required. Power supply to the
motor is cut in the event of overload. In order to restart the drive system, the
supply voltage to the control unit must be temporarily disconnected for at least
5 seconds.
Built-in short circuit protection protects against short circuits between the
phases of the motor and between the phases and earth.
Table 3 Protection and alarm functions
Protective
function
Supply fault, over-
voltage
Supply fault,
under-voltage
Pre-alarm, rotation
monitor
Rotation
monitor
Pre-alarm, motor
protection/over-
load
8 Description
External alarm
with alarm relay
Yes, immediately
No
Yes
No
Restart
Automatic
Motor not stop-
ped
The system tries
to reset three
times
Emotron AB 01-3333-01r3
Alarm reset
Automatic
1)
Automatic