GE Multilin MM300, Instruction Manual

Page: 117 / 198

CHAPTER 5: SETPOINTS CONFIGURATION SETPOINTS
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 5–7
Full-voltage non-
reversing starter
If the Starter Type setpoint is programmed to “FV Non-Reversing”, the pre-contactor relay
(if any) is picked up for the set
Pre-Contactor Time
when a start control is received. When
the pre-contactor timer times out, the contactor A relay picks up and seals-in, starting the
motor. When a stop control is received, the contactor A relay is dropped out and the motor
stops.
The following figure illustrates typical starter timing beginning from the stopped state.
Figure 5-5: Typical starter timing for full-voltage non-reversing starter
The following additional setpoint is available for the full-voltage non-reversing starter.
Pre-Contactor Time
Range: 0 to 60 seconds in steps of 1
Default: 0 seconds
This setpoint represents the time after a start command before the motor is started.
Most starters do not use this delay for forced starts such as undervoltage restart
immediate and external start. This setpoint is also used by the inverter starter and the
soft start starter to set the amount of time between powering up an inverter or soft
starter and sending the ramp-up command. An audible or other warning signal can be
activated in this interval by connecting the signal to a contact output set to the pre-
contactor function.
Full-voltage reversing
starter
The full-voltage reversing starter type is a full-voltage or across-the-line reversing starter.
When a start A (forward) 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, the contactor A relay
picks up and seals-in, starting the motor in the forward direction. When a start B (reverse)
control is received, the A contactor is dropped out. When contactor A status off is received,
the starter waits for the set
Transfer Time
to allow the motor to slow or stop. When the
transfer time timer times out, the contactor B relay picks up and seals-in, starting the
motor in the reverse direction. When a stop control is received, the contactor A and B
relays are dropped out and the motor stops. The starter logic is fully symmetrical between
forward and reverse.
When a contact input has its function set to “Forward Limit”, and that contact closes, the
contactor A relay will drop out. When a contact input has its function set to “Reverse Limit”,
and that contact closes, the contactor B relay will drop out.
The pre-contactor is omitted on forced starts (for example, undervoltage restart immediate
or external start). Forced starts are not supervised by this starter transfer timer – any
external starting circuit must itself respect fast direction change restrictions.
The following figure illustrates typical starter timing beginning from the stopped state.
Contactor B relay
Contactor A relay
Pre-contactor
Starting
Running
St
ar
tA
St
ar
tB
St
ar
tA
Stop
Motor current
P
P = Pre-contactor time setting
853717A1.CDR