Owner's manual

Appendix E Data Scales
148 Series PM174 Powermeters
Appendix E Data Scales
The maximum values for volts, amps and power in the PM174
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
Maximum
frequency
50 or 60 Hz 100 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.