Delta MM300 Instruction Manual Page 44

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CHAPTER 2: INSTALLATION STARTER TYPES
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 2–25
2.3.4 Wye-delta open transition starter
Figure 28: Wye-delta open transition starter wiring
The wye-delta open transition starter is a reduced voltage starter.
When a start A control is received, the pre-contactor relay (if any) is picked up for the set
pre-contactor time. When the pre-contactor timer times out, relay1 picks up and seals-in,
picking up the 1S contactor, which connects the motor in wye configuration. The 1S
contactor in turn picks up the 1M contactor, which connects the motor to the supply. The
motor is now starting at 58% voltage. When the transfer time timer expires, the relay1 is
de-energized, contactor 1S drops out, opening the wye and disconnecting the motor from
the supply. When the contactor 1S Off status is received, relay2 picks up and seals-in,
picking up the 2M contactor, which connects the motor in delta configuration. The 2M
contactor in turn picks up the 1M contactor, which connects the motor to the supply. The
motor is now running at full voltage. When a stop control is received, relays 1 and 2 drop
out, contactor 1S and 2M drop out, contactor 1M drops out, and the motor stops.
Pre-contactor is omitted on forced starts (for example, UVR Immediate, External Start).
Otherwise, type A forced starts operate in the same fashion as other type A starts, with the
transfer to full voltage occurring when the transfer time expires. Type B forced starts are
not supervised by this starter transfer timer – any external type B starting circuit must itself
respect full voltage starting restrictions.
A
B
C
1M
Stator Thermistor
I
A
I
B
I
C
Core
Balance
CT
Dual
Contactor
2M
1S
Inter-
lock
2M
1M1M2M 2M 2M
1S
1S
1S
1M
1S
2M
1S
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
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