Ampcontrol Pty Ltd
– ABN 28 000 915 542
IPM V2 USER MANUAL
IPM2B003 Revision 15
– MAY/18
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 38 of 83
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CAUTION!
Repeated restart attempts in this condition may damage the motor
The „Stopped Cooling Ratio‟ modifies the cooling output of the thermal model when the motor is stopped.
This can be used to account for reduced cooling capacity of the motor when it is not running (motor run
status monitored via MCI digital input).
The ratio is selected via the „O/L cool mult‟ setting (Level 6, Screen 7) and is adjustable from 1.0 to 5.0.
A cooling multiplier of 1 means the cooling is independent of whether the motor is running or not
– for
example, a water-cooled motor. Protection for a fan-cooled motor is based on a setting of 2.5, however,
for the best protection consult the motor manufacturer.
7.2 Short Circuit Protection
The short circuit function has a definite time characteristic. If the current exceeds the selected level for
the pre-set time then a trip occurs. The short circuit function trips the CBR relay (the CBR relay is
normally energised, and drops out when tripped).
The short circuit trip level is selected via the „Short Cct.Trip‟ setting (Level 6, Screen 4) and is a multiple
of the selected full load current, from 3.0 to 10 times FLC, in steps of 0.5. The trip time is selected via the
„Short Cct. t‟ setting (Level 6, Screen 5) and is adjustable from 20ms to 160ms.
To reset the relay following a short circuit trip it is necessary operate the reset key/digital input.
7.3 Phase Current Balance
The current balance measurem
ent „Ib‟ is displayed on the „Voltage and Current Information‟ page, Level
2, Screen 2.
If Iave is <100% the difference between the average current and each phase current is calculated. The
maximum difference is used as the current balance percentage.
If Iave is >= 100% then the current balance is calculated as:
Where:
Iave = Average of the 3 phase currents
MAX Δ I = The maximum deviation of a phase current from the average
Phase current balance protection is selected via
the „Cur.Bal.trip‟ setting (Level 6, Screen 9).
The trip level is selectable at 5%, 10%, 20%, 50%, and OFF.
The phase current balance protection is inhibited until the average current exceeds both 20% of the
selected full load current and the selected balance trip level.
If any phase drops below the selected trip setting for a period of 2 seconds then the outlet is stopped. To
reset the relay following a current balance trip, operate the reset key/digital input.
I A B C 2
Cur: 0% 0% 0%
