GE ASTAT XT QT 0008U Series User Manual

55 • Starting Procedure
Continued from previous page
6.2 Examples of Starting Curves
6.2.1 Light Loads - Pumps, Etc.
(In these cases the actual current is always lower than the Current Limit setting)
Starting Voltage- set to 30%
Current Limit - set to 300-350%
Ramp UP Time- set to 10 sec.
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.
6.2.2 High Inertia Loads: Crushers, Centrifuges, Mixers, Etc.
(In these cas
es the actual current is at the CURRENT LIMIT setting during part of the starting time)
Starting Voltage– set 40%
Current Limit– set 400%
Ramp UP Time– set 3 sec
• 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.:
Motor acceleration
time to full speed is
as re
q
uired?
No
Yes
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).
A
A
pp
l
y
the START command

GE ASTAT XT QT 0008U Series Specifications

General

Brand	GE
Model	ASTAT XT QT 0008U Series
Category	Controller
Language	English