Emerson 250-5000, Installation And Operation Manual

Page: 23 / 34

18
•
Energy Meter Installation and Operation Manual 026-1726 Rev 2
8 Solid-State Pulse Output
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 provides an additional NO
reactive energy (VARh) contact. 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 solution, 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.
Figure 8-1
- Solid-State Pulse Output
Figure 8-2
- Setting Pulse Energy