Two-Speed Starter - GE Multilin MM3 Motor Manager 3 Instruction Manual

CHAPTER 2: INSTALLATION
2.4.3 Two-speed
Starter
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
When the low speed button is pressed, the CR coil will pick up and seal itself in. The L
contactor is then picked up and the motor starts in low speed. When the high speed button
is pressed, the L contactor drops out and the H contactor picks up and seals itself in; timing
relay TR is also picked up. If the low speed button is pressed, the TR relay will prevent the
motor from going to low speed until it times out and the motor has had time to slow down.
Figure 2-8: Elementary Two-speed Magnetic Starter
To program the MM3 Motor Manager 3 for two-speed starter, set:
S1 CONFIGURATION
S1 CONFIGURATION
S1 CONFIGURATION
The TRANSFER TIME setpoint appears when the
may be required when the motor is switched from high-speed (contactor B) directly to low-
speed (contactor A). The delay starts when contactor B drops out.
The HIGH SPEED START BLOCK
set to "DISABLED", the MM3 Motor Manager 3 allows the motor to be started directly to
high speed. When set to "ENABLED", the motor must be started in low-speed before
switching to high-speed.
Start low speed sequence:
1. Start A command received by the MM3 Motor Manager 3 (serial, switch input
or faceplate).
2. Close and maintain contactor A relay – the motor is now in low speed.
Start directly to high speed (motor stopped,
1. Start B command received by the MM3 Motor Manager 3 (serial, switch input
or faceplate).
2. Close and maintain contactor B relay – the motor is now in high speed.
STARTER STARTER TYPE
STARTER TRANSFER TIME
STARTER HIGH SPEED START BLOCK
STARTER TYPE
appears when the STARTER TYPE
HIGH SPEED START BLOCK
STARTER TYPES
: TWO-SPEED
: 1 to 125 sec.
: ENABLE or DISABLE
is "TWO-SPEED". This delay
is "TWO-SPEED". When
not enabled):
2–11