2.2 Wiring overview
ATTENTION : CA2150-E INPUT WIRING SIGNAL
Before connecting signal wires, the Signal and Input Range should be verified for proper position.
CAUTION:
Connect Only one input signal range to the meter. Hazardous signal levels may be present on
unused inputs.
CAUTION: The isolation rating of the input common of the meter with respect to the option card common and
to the Logical Functions common (if used) is 250 Vrms and 500 Vrms with respect to AC Power (terminals 1
and 2 of connector CN1). To be certain that the ratings are not exceeded, these voltages should be verified by
a high-voltage meter before wiring the meter.
CAUTION:
1- Where possible, connect the neutral side of the signal (including current shunts) to the input common of
the meter. If the input signal is sourced from an active circuit, connect the lower impedance (usually
circuit common) to the input signal common of the meter. (pin 1 CN2)
2- For phase to phase line monitoring where a neutral does not exist, or for any other signal input in which
the isolation voltage rating is exceeded, an isolating potential transformer must be used to isolate the
input voltage from earth. With the transformer, the input common of the meter can then be earth
referenced for safety.
3- When measuring line currents, the use of a current transformer is recommended. If using external
current shunts, insert the shunt in the neutral return line. If the isolation voltage rating is exceeded, the
use of an isolating current transformer is necessary.
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