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Quick Start, Initial Parameters
Current Transformer Set-up (MX Only)
CT Switch Settings
When the starter is shipped from the factory, CT settings
are set to match CT ratios supplied with the starter. If the
MX control is changed the CT settings must be changed to
match the CT ratios for that given current rating.
To verify or change the motor current signal scaling:
•
Compare the CT ratio stamped on each CT to the CT
ratio listed on the wiring diagram supplied with the
starter to ensure the correct CTs are installed.
•
Inspect the control card to ensure that the DIP switches
are in the correct positions for the applicable CT ratio
and the motor full-load current (FLA).
Table 2.
CT switch settings
CT
Minimum
Maximum
Ratio
FLA (A
)
FLA (A
rms
73
128
2640
151
330
590
5760
720
CT Polarity (MX and MX2)
CT has a polarity that must be correct for starter to
accurately measure Watts, kW Hours, Power Factor, and
for Power and TruTorque motor control functions to
operate properly.
Each CT has a dot on one side of flat surfaces. The dot,
normally white, must be facing in direction of the line.
The CT can be placed either before or after the starter. In
specific applications, like Inside Delta, the CT's must be
before the starter.
CT1 must be on Line L1 (R), CT2 must be on Line L2 (S), CT3
must be on Line L3 (T).
40
Switch 6
Switch 6
)
Position 1
Position 2
rms
128
Off
Off
151
Off
On
330
On
Off
590
On
On
720
On
Off
1280
On
On
Figure 37. RTHB - Installation of CTs
Figure 38. RTHC - Installation of CTs
Figure 39. RTHD - Installation of CTs
RLC-SVN005B-EN
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