Appendix E Data Scales
134 Series PM172 Powermeters
Appendix E Data Scales
The maximum values for volts, amps and power in the PM172 setup and in
communications are limited by the voltage and current scale settings. See
Device Options
in Chapter 4 on how to change the voltage scale in your
meter.
The following table defines the meter data scales.
Scale Conditions Range
Maximum voltage
(V max)
All configurations
Voltage scale × PT Ratio, V
1
Maximum current
(I max)
All configurations
Current scale × CT Ratio, A
2, 3
Wiring 4LN3, 3LN3, 3BLN3 V max × I max × 3, W Maximum Power
(P max)
4
Wiring 4LL3, 3LL3, 3BLL3,
3OP2, 3OP3, 3DIR2
V max × I max × 2, W
25, 50 or 60 Hz 100 Hz Maximum
frequency
400Hz 500 Hz
1
The default voltage scale is 144V. The recommended voltage scale is
120V+20% = 144V for using with external PT’s, and 690V+20% = 828V for
a direct connection to power line.
2
CT Ratio = CT primary current/CT secondary current
3
The default current scale is 2 × CT secondary (2.0A with 1A secondaries and
10.0A with 5A secondaries)
.
4
Maximum power is rounded to whole kilowatts. With PT=1.0, it is limited to
9,999,000 W.
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