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APPLICATION EXAMPLES
NOTE
When using DC brake, the mains supply must be connected to the soft starter (input terminals L1, L2, L3)
in positive phase sequence and parameter 4G Phase Sequence must be set to Positive only.
CAUTION
If the brake torque is set too high, the motor will stop before the end of the brake time and the motor will suffer
unnecessary heating which could result in damage. Careful configuration is required to ensure safe operation of the
starter and motor.
A high brake torque setting can result in peak currents up to motor DOL being drawn while the motor is stopping.
Ensure protection fuses installed in the motor branch circuit are selected appropriately.
9.6
Soft Braking
For applications with high inertia and/or a variable load, the EMX3 can be configured for soft braking.
In this application the EMX3 is employed with forward run and braking contactors. When the EMX3 receives a start
signal (pushbutton S1), it closes the forward run contactor (KM1) and controls the motor according to the
programmed primary motor settings.
When the EMX3 receives a stop signal (pushbutton S2), it opens the forward run contactor (KM1) and closes the
braking contactor (KM2) after a delay of approximately 2-3 seconds (KT1). KA3 is also closed to activate the secondary
motor settings, which should be user programmed for the desired stopping performance characteristics.
When motor speed approaches zero, the zero speed detector (A2) stops the soft starter and opens the braking
contactor (KM2).
6
1
3
4
5
7
2
1
1
Control voltage (model dependent)
KA3
Brake relay
2
Remote control inputs
KA4
Zero speed detector relay
3
Motor thermistor input
KM1
Line contactor (Run)
4
RTD/PT100 input
KM2
Line contactor (Brake)
5
Relay outputs
KT1
Run delay timer
6
Three-phase supply
KT2
Brake delay timer
7
Motor terminals
KT3
Zero speed detector delay timer*
A2
Zero speed detector
S1
Start contact
F1
Semiconductor fuses (optional)
S2
Stop contact
KA1
Run relay
S3
Reset contact
KA2
Start relay
* The KT3 timer is only required if the zero speed detector is the type that performs a self-test upon power-up and
momentarily closes the output relay.
Page 66
EMX3 User Manual
710-04840-00J