Nidec Digistart D4 - Soft Start Methods

Operation
Application
Start Mode
Start Ramp Time
(seconds)
Initial Current
(%FLC)
Current Limit
(%FLC)
Stop Mode
Stop Time (seconds)
Fan - high pressure
Constant
Current
1 200 450
Coast To Stop
n/a
Mill - ball
Constant
Current
1 200 450
Coast To Stop
n/a
Mill - hammer
Constant
Current
1 200 450
Coast To Stop
n/a
Pump - bore
Adaptive
Control
(Const. accel.)
3 n/a 500
Adaptive
Control
(Const. decel.)
3
Pump - centrifugal
Adaptive
Control
(Const. accel.)
10 n/a 500
Adaptive
Control
(Const. decel.)
15
Pump - hydraulic
Constant
Current
2 200 350
Coast To Stop
n/a
Pump - positive
displacement
Adaptive
Control
(Const. accel.)
10 n/a 400
Adaptive
Control
(Const. decel.)
10
Pump - submersible
Adaptive
Control
(Const. accel.)
5 n/a 500
Adaptive
Control
(Const. decel.)
5
Saw - bandsaw
Constant
Current
1 200 450
Coast To Stop
n/a
Saw - circular
Constant
Current
1 200 350
Coast To Stop
n/a
Shredder
Constant
Current
1 200 450
Coast To Stop
n/a
8.6 Soft Start Methods
Constant Current
Constant current is the traditional form of soft starting, which raises the current from zero to
a specified level and keeps the current stable at that level until the motor has accelerated.
Constant current starting is ideal for applications where the start current must be kept below
a particular level.
Current (%motor full load
current)
700%
600%
500%
300%
100%
400%
200%
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
1
3
2
1: Initial Current (parameter 2C)
2: Current Limit (parameter 2D)
3: Full voltage current
Rotor speed (% full speed)
38