WORKING WITH THE MPG-2 RELAY
PULSE OUTPUT MODES:
The MPG-2 Meter Pulse Generator allows the outputs to be
configured in either the "Toggle" or "Fixed" pulse output mode. In the
Toggle
mode, the
outputs alternate or toggle back and forth each time a pulse is generated. This is
synonomous with the classic 3-Wire Pulse metering and emulates the SPST KYZ switch
model. Figure 1 below shows the timing diagram for the "Toggle" output mode. KY and KZ
closures or continuity are always opposite of each other. In other words, when the KY
terminals are closed (on), the KZ terminals are open(off). This mode is best for timing
pulses to derive demand, whether 2 or 3 wires are being used.
Contact the factory for technical support at (970)461-9600.
In the Fixed output mode, shown in Figure 2 below, an output pulse (K-Y closure only) is a
fixed width (T1) each time the output is triggered. The pulse width (closure time) is
determined by the W command using the Programming port. (See Page 7.) This mode is
best for energy
counting
systems but generally is not best for systems doing demand control
where pulses are timed to derive instantaneous kW demand. The K-Z output is not used in
the Normal/Fixed(A) mode. However, it is used in the Signed mode. See Page 7.
T1
Figure 2: 2-Wire Only FIXED Output Operation
K-Y Out
Open
Closed
Open
Closed
K-Z Out
Figure 1: 2-Wire or 3-Wire TOGGLE Output Operation
K-Z Out
K-Y Out
Open
Open
Closed
Closed
KY closure time
In Signed mode, with a Form A output mode selected, the K-Z output pulse represents
negative (or kWh received) energy. (See Page 7.)
