Delta MM300 Instruction Manual Page 42

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CHAPTER 2: INSTALLATION STARTER TYPES
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 2–23
2.3.3 Two-speed starter
Figure 27: Two-speed starter typical wiring
This starter type is a full voltage or across-the-line two speed starter.
When a start A (low speed) 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 contactor L, which starts the motor in low speed. When a start B
(high speed) control is received, the relay1drops out, and contactor L drops out. When
contactor L Off status is received, the relay2 picks up and seals-in, picking up contactor H,
which starts the motor in high speed. Should a start A (low speed) control be received when
relay2 is picked up, relay2 is drops out, and contactor H drops out. When contactor H Off
status is received, the starter waits for the set transfer time to allow the motor to slow.
When the transfer time timer times out, the relay1 picks up and seals-in, picking up
contactor L, which starts the motor in low speed. When a stop control is received, the
relays 1 and 2 drop out, contactors L and H drop out, and the motor stops. If the
HIGH
SPEED START BLOCK
setting is “Enabled”, this starter will not allow a start B (high speed)
control unless already running at low speed.
The pre-contactor is omitted on forced starts (for example, UVR Immediate, External Start).
Forced starts are not supervised by the starter transfer timer – any external starting circuit
must itself respect high to low speed transition restrictions and starting in high speed
restrictions.
A
B
C
L L L
H
Stator Thermistor
Core
Balance
CT
Dual
Contactor
H H H
L
L
Inter-
lock
H
MOTOR
H H
I
A
I
B
I
C
MM300
Low Voltage
Motor
Manager
D2
D1
D8
D7
D6
D5
D4
D3
CT Module
PSU
C1
C2
C3
C4
C5
C6
C7
C8
I/O Module- Type C
C9
C10
C11
C12
C13
C14
Aux VT
+
-
Com
+
CPU
-
Grd
R
I
Surge Grd
Core
Balance
Thermistor
RS485
CT2
CT3
G/F
CT1
RS485 Serial Link
Ground at one point
Grd
N
L
IN 1 IN 2 IN 3 IN 4 IN 5 IN 6 Com
Relay 1Relay 2
LN
Order Code : MM300-XEHSSCA
Consumer & Industrial
Multilin
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