15/05/96
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MPC2000 01/96B
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 %
1
10
100
To = 60
To = 30
