Page
22
Issue 2 22/4/98
MPC2000D
Unbalance Current
This user adjustable setting allows the specifying of the amount of current unbalance that the motor can tolerate. This
can be set between the range of 10 and 40% in steps of 1% of FLC, with a default setting of 15%.
Current Unbalance Maximum Time
This setting specifies the maximum time that the current may be unbalanced before a trip is initiated. The setting is
adjustable via the keypad within the range 20 - 120 seconds in steps of 1 second, the default value being 30 seconds.
This time delay corresponds to the lowest possible unbalance current setting i.e. 10%.
The unbalance trip function is an inverse-time characteristic of the form
T = 100 To
where
To = The current unbalance maximum time
(uB)
2
uB = The unbalance in %.
However the minimum trip time is 1 second and the minimum pick up is the same as the setting “unbalance Current”
above.
15 %
20 %
0.1
1
10
To = 60
To = 30
