INSTALLATION
5.4
Control Wiring
The EMX3 has three fixed inputs for remote control. These inputs should be controlled by contacts rated for low voltage, low current
operation (gold flash or similar).
1
A
B
A B
C
A
B
C
C
2
3
C32
C31
C24
C23
C42
C41
03
94
3.
D
C32
C31
C24
C23
C42
C41
C32
C31
C24
C23
C42
C41
1
Two-wire control
2
Three-wire control
3
Four-wire control
A
Start
B
Stop
C
Reset
CAUTION
The control inputs are powered by the soft starter. Do not apply external voltage to the control input terminals.
Cables to the control inputs must be segregated from mains voltage and motor cabling.
The reset input can be normally open or normally closed. Use parameter 6M to select the configuration.
5.5
Relay Outputs
The EMX3 provides four relay outputs, one fixed and three programmable.
The Run output closes when the soft start is complete (when the starting current falls below 120% of the programmed motor full load
current) and remains closed until the beginning of a stop (either soft stop or coast to stop).
Operation of the programmable outputs is determined by the settings of parameters 7A~7I.
•
If assigned to Main Contactor, the output activates as soon as the soft starter receives a start command and remains
active while the soft starter is controlling the motor (until the motor starts a coast to stop, or until the end of a soft
stop).
•
If assigned to a trip function, the output activates when a trip occurs.
•
If assigned to a flag, the output activates when the specified flag is active (parameters 7M~7O).
CAUTION
Some electronic contactor coils are not suitable for direct switching with PCB mount relays. Consult the contactor
manufacturer/supplier to confirm suitability.
Three additional outputs are available on the input/output expansion card.
5.6
Motor Thermistors
Motor thermistors can be connected directly to the EMX3. The soft starter will trip when the resistance of the thermistor circuit
exceeds approximately 3.6 k
Ω
or falls below 20
Ω
.
If no motor thermistors are connected to the EMX3 thermistor input terminals B4, B5 must be open. If B4, B5 are shorted, the EMX3
will trip.
The thermistor input is disabled by default, but activates automatically when a thermistor is detected. If thermistors have previously
been connected to the EMX3 but are no longer required, either:
•
connect a 1.2 k
Ω
resistor between B4, B5 or
•
reset the starter to factory defaults (refer to
on page 45). If you wish to retain the starter’s
configuration, save the starter’s settings to a user set before resetting. Reload the settings after the thermistor input
has been reset
NOTE
The thermistor circuit should be run in screened cable and must be electrically isolated from earth and all other power
and control circuits.
10
| User Manual (710-04840-00M)
