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ML0042 October 15, 2019 Copyright 2019 Bitronics, LLC
3.6 Optional Energy Pulse Outputs
There is an option for 4 KYZ pulse outputs with common ground. Pulse output meters
are consumption monitoring devices. A pulse output power meter will indicate the
number of kWhs used by the system load. Historically, rotating meters could report
their power information remotely, using a pair of contact closures attached to a KYZ
line. In this scheme, line “K” is attached to two single-pole single-throw switches “Y”
and “Z”. “Y” and “Z” open and close as the meter’s disk rotates. As the meter rotates in
one direction, Y closes, then Z closes, then Y opens, then Z opens. When it rotates in
the opposite direction, showing export of power, the sequence reverses. The KY
element refers to a two-wire variant of KYZ, where only the K and Y wires are used in
a “normally open” configuration.
The intent of both KY and KYZ elements are mainly for meter verification and the
output of energy pulses are sent to an external counter.
The pulse outputs have the following specifications:
Output:
Type: Form A, SPST, solid state relay, maximum input voltage
170V, maximum current 130mA, on resistance 25 ohms
Accuracy: Long term average accuracy limited by meter (.2% class).
Max Pulse Rate: 20 pulses/sec
The output connection diagram is shown below:
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