10
10
ATTENTION: MICRA-E INPUT WIRING SIGNAL
Before connecting signal wires, the Signal and Input Range should be verified for proper position.
CAUTION:
Connect Orly 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 exceded, these voltajes should be verified by a high-voltage
meter befote wiring the meter.
CAUTION:
4.
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 imput signal common of the meter.
(pin 1 CN2)
5.
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 potencial 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.
6.
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.
2.2
–
WIRING OVERVIEW
ATTENTION: MICRA-E INPUT WIRING SIGNAL
Before connecting signal wires, the Signal and Input Range should be verified for proper position.
CAUTION:
Connect Orly 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 exceded, these voltajes should be verified by a high-voltage
meter befote 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 imput 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 potencial 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.
2.2
–
WIRING OVERVIEW
