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Digistart D3: User Guide
Issue: G
8.8.2 Group 1 - Primary Motor Settings
CAUTION
The motor data parameters are critical to the correct operation of the soft starter's thermal model, and to
the motor overload protection. Always set Pr 1A to suit the motor's characteristics. The default settings of
Pr 1B, 1C and 1D are suitable for most applications. Consult the motor datasheet before changing these
settings.
1A – Motor FLC
Range:
Model dependent
Description:
Matches the starter to the connected motor's full load current. Set to the full load current (FLC)
rating shown on the motor nameplate.
When connecting in inside delta, enter the motor full load current (FLC) for Pr 1A. The Digistart D3 will automatically
detect whether the motor is connected in-line or inside delta and will calculate the correct inside delta current level.
1B – Locked Rotor Current
Range:
400% - 1200% FLC
Default:
600%
Description:
Sets the locked rotor current of the connected motor, as a percentage of full load current. Set
according to the motor datasheet.
1C – Locked Rotor Time
Range:
0:01 - 2:00 (minutes:seconds)
Default:
10 seconds
Description:
Sets the maximum length of time the motor can sustain locked rotor current from cold before
reaching its maximum temperature. Set according to the motor datasheet.
1D – Motor Service Factor
Range:
100% - 130%
Default:
105%
Description:
Sets the motor service factor used by the thermal model. If the motor runs at full load current, it will
reach 100%. Set according to the motor datasheet.
NOTE
Pr 1B, 1C and 1D determine the trip current for motor overload protection. The default settings of Pr 1B,
1C and 1D provide Motor Overload Protection: Class 10, Trip Current 105% of FLA (full load amperage) or
equivalent.
8.8.3 Group 2 - Start/Stop Modes-1
For details of soft start and stop control methods, see
Soft start methods
on page 48 and
Stop methods
on page 51.
2A – Start Mode
Options:
Constant Current (default)
Adaptive Control
Description:
Selects the soft start mode.
2B – Current Limit
Range:
100% - 600% FLC
Default:
350%
Description:
Sets the current limit for constant current and current ramp soft starting, as a percentage of motor
full load current.
2C – Initial Current
Range:
100% - 600% FLC
Default:
350%
Description:
Sets the initial start current level for current ramp starting, as a percentage of motor full load
current. Set so that the motor begins to accelerate immediately after a start is initiated.
If current ramp starting is not required, set the initial current equal to the current limit.
2D – Start Ramp Time
Range:
1 - 180 (seconds)
Default:
10 seconds
Description:
Sets the total start time for an Adaptive Control start or the ramp time for current ramp starting
(from the initial current to the current limit).
