Emerson 026-1726, Installation And Operation Manual, Page: 22 / 32

16 • Energy Meter 026-1726 Rev 0 22-MAR-2011
8 Solid-State Pulse Out-
put
The Energy Meter has one normally open (NO)
KZ Form A output and one normally closed (NC) KY
solid-state output. One is dedicated to energy (Wh),
and the other to Alarm. The Energy Meter also pro-
vides an additional NO reactive energy (VARh) con-
tact. See the Setup section for configuration
information.
The solid state pulse outputs are rated for 24VAC/
DC max.
Maximum load current is 100mA at 25°C. Derate
0.56mA per °C above 25°C.
* The over-current protective device must be rated
for the short circuit current at the connection point.
** All pulse outputs and communication circuits
are only intended to be connected to nonhazardous
voltage circuits (SELV or Class 2). Do not connect to
hazardous voltages.
8.1. Set Pulse
The System Type, CT size, PT Ratio and System
Voltage must all be configured before setting the
Pulse Energy. If any of these parameters are changed,
the meter will hunt for a new Pulse Duration, but will
not change the Pulse Energy. If it cannot find a solu-
tion, the meter will display the wrench icon, show
“ConF” in the ALARM -> PULSE screen, and enable
Energy pulse output configuration error bit in the
Modbus Diagnostic Alert Bitmap (if equipped).
8.2. Set Pulse Energy — Wh/P
In Watt Hour (and VAR Hours, if present) per
pulse. When moving down to a smaller energy, the
meter will not allow the selection if it cannot find a
pulse duration that will allow the pulse output to keep
up with Theoretical Maximum System Power. When
moving up to a larger energy, the meter will jump to
the first value where it can find a valid solution.
8.3. Minimum Duration Time —
Milliseconds per Pulse (mS/P)
This read-only value is set by the meter to the
slowest duration (in mS per closure) that will keep up
with the Theoretical Maximum System Power. The
open time is greater than or equal to the closure time.
The maximum Pulses Per Second (PPS) is shown in
yellow.
8.4. MultiFlex I/O Board Pulse Lim-
its - Standalone Version Only
The MultiFlex board can read pulses at a maxi-
mum of 5HZ or 5PPS. The Energy Meter is capable
of pulsing faster than the 5PPS maximum that the
MultiFlex board can read.
Pulses should be greater than 80mS in length at a
maximum rate of 5HZ: Do not exceed 5PPS.
For Example:
• Values of 100, 250, or 500 will be read by the Mul-
tiFlex board.
• Values of 50, 25, or 10 will not be read by the Mul-
tiFlex board.
Figure 8-1 - Solid-State Pulse Output
Figure 8-2 - Setting Pulse Energy