Instruction manual

CHAPTER 2: INSTALLATION STARTER TYPES
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 2–29
2.3.6 Soft starter type
Figure 30: Soft starter typical wiring
The soft starter type is used with an external soft starter that ramps the motor speed up on
start and down on stop. Once the motor is ramped up, the soft starter can be bypassed.
When a start A control is received, the relay1 picks up and seals-in, picking up contactor
1M. This provides power for the soft starter to start up and to drive the motor. The pre-
contactor relay (if any) is picked up for the set delay, then relay 2M signals the soft starter
to ramp the motor up. When the soft starter signals up to speed by picking up auxiliary
relay UTS, the starter generates the soft starter bypass signal. When a stop control is
received, relay2 drops out, signalling the soft starter to ramp down. When the ramp down
time timer has expired, relay1 is opened, M1 drops out, cutting power to the soft starter
and motor.
Forced starts (for example, External Start) operate in the same fashion as other starts,
relay2 closes after a 1 second delay. If up-to-speed feedback is not received from auxiliary
relay UTS within the
RAMP UP TIME setting during a start, a Drive Start Failed alarm is
generated. If soft starter speed feedback remains when the ramp down time expires
during a stop, a Drive Stop Fail alarm is generated. Neither results in a trip or a stop. The
Drive Start Failed alarm is cleared by a stop control.
The B Open Contactor Control Circuit and B Welded Contactor alarms implemented in the
start/stop control element are defeated when the soft starter is selected.
The Undervoltage Autorestart feature is disabled for the Soft Starter.
NOTE
NOTE:
Connect AUX VT to the Control Supply for correct operation of the UV Restart feature and
readings of inputs.
A
B
C
1M 1M 1M
MOTOR
1M
Stator Thermistor
1M
Field Start
Reset
Core Balance CT
Contactor
SOFT STARTER
UTS
Up To
Speed
Output
Stop
UTS
Field Stop
BP BP BP
Com
Run
2M
2M
BP
UTS 2M
I
A
I
B
I
C
RS485 Serial Link
Ground at one point
Order Code : MM300-XEHSSCA
MM300
Low Voltage
Motor
Manager
D2
D1
D8
D7
D6
D5
D4
D3
CT Module
CT2
CT3
G/F
CT1
C1
C2
C3
C4
C5
C6
C7
C8
I/O Module- Type C
C9
C10
C11
C12
C13
C14
Aux VT
IN 1 IN 2 IN 3 IN 4 IN 5 IN 6 Com
Relay 1Relay 2
LN
+
-
Com
+
CPU
-
R
I
Surge Grd
Core
Balance
Thermistor
RS485
PSU
N
L
Consumer & Industrial
Multilin