GE MM300 Instruction Manual page 49

CHAPTER 2: INSTALLATION
NOTE:
NOTE
NOTE:
NOTE
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Figure 2-33: Two-speed starter typical control wiring IO_E
AC
Control Power
GE Multilin
MM300
Low Voltage
Manager
The above drawing applies only to a high-voltage power supply. If a low-voltage (DC)
power supply is used, an appropriate DC voltage source must be used for this power
supply.
.
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
setting is "Enabled", this starter will not allow a start B (high speed)
SPEED START BLOCK
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.
Connect AUX VT to the Control Supply for correct operation of the UV Restart feature and
correct input readings.
C14
PSU
C13
C12
C11
C10
C9
C8
C7
Motor
C6
C5
C4
C3
C2
C1
STARTER TYPES
Low Voltage
DC Suppl to
IO T pe E
-
+
Field Start High
Field Start Low
Field Stop
L
H
H
Inter-
lock
L
853706B3.cdr
HIGH
2–29