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Apply the START command
Motor acceleration
time to full speed is
Check Last Start Time and set Max. Start time to approximately 5 seconds
•
longer than the Last Start Time.
•
For future reference it is advised to keep records of the following parameters in the
Statistical Data:
Last Start Time:
Last Start Curr.:
Examples of Starting Curves
6.2
Light Loads - Pumps, Etc.
6.2.1
(In these cases the actual current is always lower than the Current Limit setting)
Starting Voltage-
set to 30%
Current Limit -
Ramp UP Time-
Upon start, the voltage quickly increases to the Starting Voltage value (30% of Un) and then gradually ramps-
up to nominal.
The current will simultaneously increase to peak current value (lower than the Current Limit setting), before
smoothly decreasing to the operating current.
High Inertia Loads: Crushers, Centrifuges, Mixers, Etc.
6.2.2
(In these cases the actual current is at the CURRENT LIMIT setting during part of the starting time)
Starting Voltage–
set 40%
Current Limit–
set 400%
set 3 sec
Ramp UP Time–
• Starting Procedure
55
A
No
as required?
Yes
set to 300-350%
set to 10 sec.
If acceleration time is too short, increase Ramp
UP Time setting and/or decrease Current
Limit setting (when decreasing Current
Limit, make sure that the motor increases
speed gradually and does not stall).
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