P77 Input Phase Sensitivity FUN 04
LED Display LCD Display
Range LED LCD Description
InS Insensitive Runs with any three phase sequence. (Default)
AbC ABC Only runs with ABC phase sequence.
CbA CBA Only runs with CBA phase sequence.
SPH Single phase Single Phase.
Description The Input Phase Sensitivity parameter sets the phase sensitivity of the starter. This can be used to protect the
motor from a possible change in the incoming phase sequence. If the incoming phase sequence does not
match the set phase rotation, the starter displays an Alarm while stopped and faults if a start is attempted.
P78 CT Ratio FUN 03
LED Display LCD Display
Range 72:1, 96:1, 144:1, 288:1, 864:1, 2640:1, 3900:1, 5760:1, 8000:1, 14400:1, 28800:1 (Default 288:1)
Description The CT ratio must be set to match the CTs (current transformers) supplied with the starter. This allows the
starter to properly calculate the current supplied to the motor.
Only Benshaw supplied CTs can be used on the starter. The CTs are custom 0.2 amp secondary CTs
specifically designed for use on the MX
2
starter. The CT ratio is then normalized to a 1A secondary value.
The supplied CT ratio can be confirmed by reading the part number on the CT label. The part number is of
the form BICTxxx1M, where xxx is the CT primary and the 1 indicates the normalized 1 amp.
z NOTE: It is very important that the CT ratio is set correctly. Otherwise, many starter functions will not
operate correctly.
Refer to Table 3 - CT Ratios on page 13.
126
6 - PARAMETER DESCRIPTION
FUN: Phase Order
04 Insensitive
FUN: CT Ratio
03 288:1
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