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Safety
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70
Digistart IS User Guide
www.controltechniques.com
Issue: 4
Display
Possible cause/Suggested solution
Frequency (Mains supply)
The mains frequency has gone beyond the specified range.
Check for other equipment in the area that could be affecting the mains supply, particularly variable
speed drives and switch mode power supplies (SMPS).
If the Digistart IS is connected to a generator set supply, the generator may be too small or could have a
speed regulation problem.
This trip is not adjustable.
Related Pr:
5I
,
5J
,
6F
,
16H
Ground fault
This fault only occurs if the RTD/Ground Fault card is fitted. Test the insulation of the output cables and
the motor. Identify and resolve the cause of any ground fault.
Related Pr: 5K, 6H, 16P
Heatsink overtemperature
Check if cooling fans are operating. If mounted in an enclosure, check if ventilation is adequate.
Fans operate during Start, Run and for 10 minutes after the starter exits the Stop state.
NOTE
Models IS1x0023B to IS1x0053B and IS2x0170B do not have a cooling fan. Models with fans
will operate the cooling fans from a Start until 10 minutes after a Stop.
Related Pr:
16N
Input A trip
Identify and resolve the condition which caused Input A to activate.
Related Pr:
3A
,
3B
,
3C
,
3E
,
3D
,
16I
Input B trip
Identify and resolve the condition which caused Input B to activate.
Related Pr:
3F
,
3G
,
3H
,
3J
,
3I
,
16J
Instantaneous
overcurrent
Current to the motor has exceeded the soft starter's built-in trip points:
7.2 times the Pr
1A
Motor Full Load Current
6 times the starter's nominal current rating
Causes can include a locked rotor condition or an electrical fault in the motor or cabling.
This trip is not adjustable.
Related Pr: None
Internal fault X
This trip is not adjustable.
The Digistart IS has tripped on an internal fault. Contact your local supplier with the fault code (X).
Related Pr: None
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 3.3% 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.
Phase loss can also be caused by a failed SCR, particularly an SCR that has failed open circuit. A failed
SCR can only be definitely diagnosed by replacing the SCR and checking the starter's performance.
Related Pr: None
Please contact Control Techniques 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 Digistart IS 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 IS has detected a drop in the control voltage.
Check the external control supply (terminals 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
Motor overload (thermal
model)
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
Excessive throughput
Damage to the motor windings
Resolve the cause of the overload and allow the motor to cool.
Related Pr:
1A
,
1B
,
1C
,
1D
,
16A