Digistart D3: User Guide
93
Issue: G
Display
Possible cause/Suggested solution
L1 phase loss
L2 phase loss
L3 phase loss
This trip is not adjustable.
During pre-start checks the starter has detected a phase loss as indicated.
In run state, the starter has detected that the current on the affected phase has dropped below
2% of the programmed motor FLC for more than 1 second, indicating that either the incoming
phase or connection to the motor has been lost.
Check the supply and the input and output connections at the starter and at the motor end.
Related Pr: None
Please contact Nidec or your local distributor.
L1-T1 shorted
L2-T2 shorted
L3-T3 shorted
During pre-start checks the starter has detected a shorted SCR or a short within the bypass
contactor as indicated. If the starter is connected in-line with the motor, consider using
PowerThrough to allow operation until the starter can be repaired.
NOTE
PowerThrough is only available with in-line installations. If the starter is installed
inside delta, PowerThrough will not operate.
The starter will trip on Lx-Tx Shorted on the first start attempt after control power
is applied. PowerThrough will not operate if control power is cycled between
starts.
Related Pr: 15D
Low Control Volts
The Digistart D3 has detected a drop in the internal control voltage.
•
Check the external control supply (CSH, CSL, CSR) and reset the starter.
If the external control supply is stable:
•
the 24 V supply on the main control PCB may be faulty; or
•
the bypass driver PCB may be faulty (internally bypassed models only). Contact your local
supplier for advice.
This protection is not active in Ready state.
Related Pr: 16X
Low Level
This is a name selected for a programmable input. See Input A trip.
Low Pressure
This is a name selected for a programmable input. See Input A trip.
Motor overload
The motor has reached its maximum thermal capacity. Overload can be caused by:
•
The soft starter protection settings not matching the motor thermal capacity
•
Excessive starts per hour or start duration
•
Excessive current
•
Damage to the motor windings
Resolve the cause of the overload and allow the motor to cool.
Related Pr: 1A, 1B, 1C, 1D, 16A
Motor 2 overload
See 'Motor overload' above.
NOTE
Applicable only if the second motor set has been programmed.
Related Pr: 11A, 11B, 11C, 11D, 11E, 16A
Motor Connection Tx
Where 'X' is 1, 2 or 3.
The motor is not connected correctly to the soft starter.
•
Check individual motor connections to the soft starter for power circuit continuity.
•
Check connections at the motor terminal box.
This trip is not adjustable.
Related Pr: None
Motor thermistor
The motor thermistor input has been enabled and:
•
The resistance at the thermistor input has exceeded 3.6 k
Ω
for more than one second.
•
The motor winding has overheated. Identify the cause of the overheating and allow the
motor to cool before restarting.
•
The motor thermistor input has been opened.
NOTE
If a valid motor thermistor is no longer used, a 1.2 k
Ω
resistor must be fitted across
terminals TH1, TH2.
Related Pr: 16K
