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5–12
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
CONFIGURATION SETPOINTS
CHAPTER 5: SETPOINTS
Ramp Up Time
Range: 0 to 125 seconds in steps of 1
Default: 1second
This setpoint specifies the time after signalling the inverter starter to ramp up that the
up-to-speed feedback can be delayed without issuing a Drive Start Fail alarm.
Ramp Down Time
Range: 0 to 125 seconds in steps of 1
Default: 1second
This setpoint specifies the time after signalling the inverter starter to ramp down before
the main contactor is opened, cutting power to the starter. If speed feed back is still on
when this time expires, a Drive Stop Fail alarm is issued.
Soft starter
The “Soft Starter” type is used with an external soft starter that ramps the motor speed up
on start and down on stop. Once the motor is ramped up, the soft starter can be bypassed.
When a start A control is received, the pre-contactor (if any) is picked up for the set delay,
then relay1 picks up and seals-in, picking up contactor 1M. This provides power for the Soft
Starter to start up. Relay2 closes after a 1 second delay, and seals in, which signals the soft
starter to ramp up the motor. When a stop control is received, the relay2 drops out, and
the soft starter ramps down. When the ramp down time timer has expired, relay1 is
opened, contactor 1M drops out, cutting power to the soft starter and motor.
Forced starts (for example, external start) operate in the same fashion as other starts, with
the B contactor not calling for the soft starter to ramp until the pre-contactor timer times
out.
If up to speed feedback is not received from the soft starter via the contactor B status
within the
Ramp Up Time
setpoint during a start, a Drive Start Failed alarm is generated. If
soft starter 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 B Open Contactor Control Circuit and B Welded Contactor alarms implemented in the
start/stop control element are defeated when the soft starter is selected.
If the soft starter does not provide an up to speed feedback signal, the contactor B relay
contact or an auxiliary contact of the B contactor should be connected to the up to speed
feedback contact input to suppress spurious Drive Failed To Start alarms.
The Undervoltage Autorestart feature is disabled for the Soft Starter.
The following figure illustrates typical starter timing beginning from the stopped state.
Figure 5-10: Typical starter timing for the soft starter
The following additional setpoints are available for the soft starter.
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 ...
Страница 192: ...8 2 MM300 MOTOR MANAGEMENT SYSTEM INSTRUCTION MANUAL COMMUNICATIONS INTERFACES CHAPTER 8 COMMUNICATIONS ...
Страница 198: ...A 6 MM300 MOTOR MANAGEMENT SYSTEM INSTRUCTION MANUAL REPAIRS CHAPTER A APPENDIX A ...