PM 1000268 000 00
Device handbook SIRAX MM1200
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14. Relay output (Optional)
This instrument is provided with either 1 relay for pulse output as well as for limit switch.
14.1 Pulse Output:
Pulse output is the potential free, very fast acting relay contact which can be used to drive an external mechanical counter for energy measure-
ment. This instrument’s pulse output can be confi gured to any of the following parameter through setup parameter screen.
1) Active Energy (Import)
4) Reactive Energy (Export)
2) Active Energy (Export)
5) Apparent Energy
3) Reactive Energy (Import)
6) Ampere hour
TABLE 3: Energy Pulse Rate Divisor
1. For Energy Output in Wh
Above options are also applicable for Apparent and Reactive Energy.
* System power = 3 x CT(Primary) x PT(Primary)
L-N
for 3 Phase 4 Wire
System power = Root3 x CT(Primary) x PT(Primary)
L-L
for 3 Phase 3 Wire
Ampere Hour:
Divisor 1(Default)
CT secondary = 1A Max pulse rate 3600 pulses per Ah **
CT secondary = 5A Max pulse rate 720 pulses per Ah **
Divisors 10
CT secondary = 1A Max pulse rate 3600 pulses per 10Ah **
CT secondary = 5A Max pulse rate 720 pulses per 10Ah **
Divisors 100
CT secondary = 1A Max pulse rate 3600 pulses per 100Ah **
CT secondary = 5A Max pulse rate 720 pulses per 100Ah **
Pulse rate
Divisor
Pulse
System Power *
1
1per Wh
Up to 3600W
1per kWh
Up to 3600kW
1per Mwh
Above 3600kW
10
1per 10Wh
Up to 3600W
1per 10kWh
Up to 3600kW
1per 10MWh
Above 3600kW
100
1per 100Wh
Up to 3600W
1per 100kWh
Up to 3600kW
1per 100MWh
Above 3600kW
1000
1 per 1000Wh
Up to 3600W
1 per 1000kWh
Up to 3600kW
1per 1000MWh
Above 3600kW
Pulse Duration 60 ms, 100 ms or 200 ms
2. For Energy Output in Kwh
Pulse rate
Divisor
Pulse
System Power *
1
1per kWh
Up to 3600kW
1 per 1000kWh
Up to 3600kW
1per 1000MWh
Above 3600kW
3. For Energy Output in Mwh
Pulse rate
Divisor
Pulse
System Power *
1
1 per Mwh
Up to 3600W
1 per 1000Mwh
Up to 3600W
1 per 1000Gwh
Above 3600kW
14.2 Limit Switch
Limit switch can be used to monitor the measured parameter ( Ref.Table:2 ) in relation with to a set limit.
The limit switch can be confi gured in one of the four mode given below:
1) Hi alarm & Relay Energized Relay..
2) Hi alarm & De-Energized Relay.
3) Lo alarm & Energized Relay.
4) Lo alarm & De-Energized Relay.
Limit switch has user selectable Trip point, Hysteresis, Energizing Delay & De-Energizing delay.
Divisors 1000
CT secondary = 1A Max pulse rate 3600 pulses per 1000Ah **
CT secondary = 5A Max pulse rate 720 pulses per 1000Ah **
Pulse duration 60 ms, 100 ms or 200 ms
**No. of Pulses per Ampere hour = Maximum Pulses / CT Ratio
Where, CT Ratio = (CT primary/ CT Secondary)
