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© 2011 Schneider Electric. All Rights Reserved.
63230-500-225A2 PowerLogic
TM
Series 800 Power Meter
3/2011 Chapter 5—Input/Output Capabilities
43
In Figure 5–3, the transitions are marked as 1 and 2. Each transition represents the time
when the relay contact closes. Each time the relay transitions, the receiver counts a pulse.
The power meter can deliver up to 12 pulses per second in a 2-wire application.
Fixed Pulse Output
Fixed pulse output mode generates a fixed duration pulse output that can be associated
with kWh consumption. Figure 5–4 shows the difference in pulse duration values when
either TRANS mode or PULSE mode is selected. This mode selection is configured on the
MAINT > IO > ADVAN menu.
Figure 5–4: Fixed-pulse output
Calculating the Kilowatthour-Per-Pulse Value
The following example illustrates how to calculate kilowatthours per pulse (pulse weight).
To calculate this value, first determine the highest kW value you can expect and the
required pulse rate. Remember the maximum number of pulses is 8 per second.
In this example, the following conditions are set:
• The metered load should not exceed 1600 kW.
• About two KY pulses per second should normally occur. (If a higher load is reached, the
number of pulses per second can increase and still stay within the set limits.)
Step 1: Convert 1600 kW load into kWh/second.
Step 2: Calculate the kWh required per pulse.
Step 3: Adjust for the KY initiator (KY will give one pulse per two transitions of the relay).
0.02kW 0.04kW 0.06kW 0.08kW 0.1kW
0.12kW 0.14kW 0.16kW
Pulse Weight = 0.02kWHr/pulse
TRANS mode:
PULSE mode (100ms):
100 msec
Setting in ADV mode:
10, 25, 50, 100, 150,
200, 300, 500, 1000
Counts = 4
Counts =
8
TRANS & PULSE mode
(1600 kWh)
1 hour
-------------------------------
X kWh
1 second
------------------------=
(1600 kWh)
3600 seconds
-------------------------------------
X kWh
1 second
------------------------=
X 1600/3600 0.444 kWh/second==
(1600 kW)(1 Hr) 1600 kWh=
0.444 kWh/second
2 pulses/second
------------------------------------------------- 0.2 22 k Wh/ pul se=