Danfoss vlt soft starter mcd 500 Operating Manual page 78

Troubleshooting
Display
Excess start time
Firing fails px
10 10 FLC too high
Frequency
76
®
VLT Soft Starter MCD 500
Possible cause/Suggested solution
Excess start time trip can occur under the following conditions:
•
Parameter 1-1 Motor Full Load Current is not appropriate for the motor.
•
Parameter 1-4 Current Limit has been set too low.
•
Parameter 1-6 Start Ramp Time has been set higher than the setting in parameter 1-9 Excess
Start Time Setting.
•
Parameter 1-6 Start Ramp Time is set too short for a high inertia load when using adaptive
control.
Related parameters:
•
Parameter 1-1 Motor FLC.
•
Parameter 1-4 Current Limit.
•
Parameter 1-6 Start Ramp Time.
•
Parameter 1-9 Excess Start Time.
•
Parameter 7-1 Motor FLC-2.
•
Parameter 7-4 Current Limit-2.
•
Parameter 7-6 Start Ramp-2.
•
Parameter 7-9 Excess Strt Time-2.
•
Parameter 16-7 Excess Start Time.
Where X is phase 1, 2, or 3.
The SCR did not fire as expected. Check for faulty SCRs and internal wiring faults.
This trip is not adjustable.
Related parameters: None.
The soft starter can support higher motor FLC full load current values when connected to the
motor using inside delta configuration rather than in-line connection. If the soft starter is
connected in-line, but the programmed setting for parameter 1-1 Motor Full Load Current exceeds
the in-line maximum, the soft starter trips at start (see chapter 4.5 Minimum and Maximum Current
Settings).
If the soft starter is connected to the motor using inside delta configuration, check that the soft
starter detects the connection correctly. Contact the local Danfoss supplier for advice.
Related parameters:
•
Parameter 1-1 Motor FLC.
•
Parameter 7-1 Motor FLC-2.
The mains frequency is outside of the specified range.
Check for other equipment in the area that could be affecting the mains supply, particularly
frequency converters and switch mode power supplies (SMPS).
If the soft starter is connected to a generator-set supply, the generator may be too small or could
have a speed control problem.
Related parameters:
•
Parameter 2-8 Frequency Check.
•
Parameter 2-9 Frequency Variation.
•
Parameter 2-10 Frequency Delay.
•
Parameter 16-5 Frequency.
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