CHAPTER 5: SETPOINTS
CONFIGURATION SETPOINTS
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
5–11
inverter to ramp up the motor. When a stop control is received, the relay2 drops out, and
the inverter ramps down. When the ramp down time timer has expired, relay1 is opened,
contactor 1M drops out, cutting power to the inverter and motor.
If contactor B status unexpectedly opens while running, signalling possible inverter
trouble, contactor B relay is dropped out and an Inverter Trip Alarm is issued, but no trip is
issued and contactor A relay remains closed. This is done so that the inverter has power to
retain its event records for subsequent diagnosis of the problem. Contactor A relay is
opened and the alarm is reset when a stop control is received.
Forced starts (for example, external start) operate in the same fashion as other starts, with
contactor B not calling for the inverter to ramp until the pre-contactor timer times out.
If up-to-speed feedback is not received from the inverter via contactor B status within the
setpoint during a start, a Drive Start Failed alarm is generated. If up-to-speed feedback
resets before a stop control, an Inverter Fail alarm is generated, and contactor B relay
opened. If inverter speed feedback remains when the
Ramp Down Time
expires during a
stop, a Drive Stop Fail alarm is generated. Neither results in a trip or a stop. The Drive Start
Failed alarm is latched until reset. The Inverter Fail alarm is also cleared by a stop control.
The B Open Contactor Control Circuit and B Welded Contactor alarms implemented in the
start/stop control element are defeated when the inverter starter is selected.
If the inverter does not provide an up-to-speed feedback signal, contactor B relay contact
or an auxiliary contact of the B contactor should be connected to the contactor B status
contact input to suppress spurious Drive Failed To Start alarms.
The Undervoltage Autorestart feature is disabled for the Inverter Starter.
The following figure illustrates typical starter timing beginning from the stopped state.
Figure 5-9: Typical starter timing for the inverter starter
The following additional setpoints are available for the inverter starter.
Pre-Contactor Time
Range: 0 to 60 seconds in steps of 1
Default: 0 seconds
This setpoint specifies the time after a start command before the motor is started. Most
starters do not use this delay for forced starts such as 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.
St
ar
tA
St
ar
tB
St
ar
tA
Stop
Contactor B relay
Contactor A relay
Pre-contactor
Starting
Running
Motor current
Stopping
P
R
P = Pre-contactor time setting
R = Ramp Down time setting
853721A3.CDR
1s
Содержание Multilin MM300
Страница 20: ...1 14 MM300 MOTOR MANAGEMENT SYSTEM INSTRUCTION MANUAL SPECIFICATIONS CHAPTER 1 INTRODUCTION ...
Страница 104: ...3 44 MM300 MOTOR MANAGEMENT SYSTEM INSTRUCTION MANUAL SOFTWARE CHAPTER 3 INTERFACING WITH THE MM300 ...
Страница 184: ...6 8 MM300 MOTOR MANAGEMENT SYSTEM INSTRUCTION MANUAL COMMANDS CHAPTER 6 DIAGNOSTICS ...
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