PM 1001812 000 00
Device handbook SIRAX BM1450
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7.2 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
measurement. The Pulse Output can be configured to any of the
parameter shown in table 6 through setup parameter screen.
Table 9: Energy Impulsratendivisor
Pulse rate for Energy output in Wh
Divisor
Pulse
Channel power
1
1pro Wh
Up to 3600W
1pro kWh
Above 3600W to 60 kW
10
1pro 10Wh
Up to 3600W
1pro 10kWh
Above 3600W to 60 kW
100
1pro 100Wh
Up to 3600W
1pro 100kWh
Above 3600W to 60 kW
1000
1 pro 1000Wh
Up to 3600W
1 pro 1000kWh
Above 3600W to 60 kW
Note: Energy Output changes from Wh to kWh if system power >60kW.
Pulse rate for Energy output in kWh
Divisor
Pulse
Channel power
1
1pro kWh
Up to 3600kW
1pro MWh
Above 3600kW*
* Applicable to 61...200V and 201...1000V model
Pulse rate for Energy output in MWh
Divisor
Pulse
1
1pro MWh
Alarm high:
If the option High alarm activated or Alarm high deactivated is selec-
ted, the relay will go into alarm condition if the measured parameter
is greater than the set limit.
Alarm low:
If the Low alarm or Low alarm option is selected, the relay will go into
alarm when the measured parameter is less than the set limit.
Relay activated / relay deactivated:
Relay activated means that the relay switch is closed in the alarm
state. Relay deactivated means that the relay switch is opened in the
alarm state.
Trip Point
This parameter decides the limit for a particular measurement para-
meter, crossing which the relay goes into alarm mode. These values
are defined in percentage of nominal value(except for energy and
ampere hour parameters).
For high alarm configuration, the ranges are 10-120%.
For low alarm, configuration, the ranges are 10-100%.
For energy and ampere hour parameters the ranges are 10-9999999.
Example:
If nominal voltage value is 48V and trip point is 60%, the
absolute value of trip point will be 28.8V(60% of 48).
Hysteresis
Hyteresis is the offset value below high alarm trip point or above low
alarm trip point, which when crossed by the measured parameter,
resets the relay to its position before tripping i.e. normal condition.
The value of hysteresis can range from 0.5 to 50% and it gets calcu-
lated on trip point value.
Example:
If trip point is 60% and hysteresis is 25%, then hysteresis
value will be equal to 15%(25% of 60). To get absolute value of
hysteresis subtract this much part of nominal value from the trip point
in case of high alarm or add this to the trip point value in case of low
alarm.
Example:
Nominal value= 48 V
Trip point = 60%
Hysteresis = 25%
Trip value = 60% of 48 V = 28.8 V
High alarm Hysteresis value = 25% of 28.8 V = 7.2 V
Relay will trip above 28.8 V & it will reset below 21.6 V (28.8 V - 7.2 V)
For negative values of trip point, calculations will be the same as
positive trip point. Only a negative sign is applied to calculated
hysteresis value.
Example:
for different configurations
Parameter N0: 4 (current 1)
Trip point = 50%
Hysteresis = 50%
Absolute hyteresis value = 50% - (50% of 50%)
= 25%
Energizing delay: 2s
De-energizing delay: 3s
Hysteresis point
Trip point
Relay energise
Relay de-energise
Time
25%
50%
Input
2s
2s
1) High alarm & Energised Relay
Hysteresis point
Trip point
Relay de-energised
Relay energise
Time
25%
50%
Input
2s
2s
2) High alarm & De-energised Relay
Trip point
Relay de-energised
Relay energise
Time
50%
75%
Input
2s
2s
3) Low alarm & Energised Relay
Hysteresis point
Trip point
Relay energise
Relay de-energised
Time
50%
75%
Input
2s
2s
4) Low alarm & De-energised Relay
Hysteresis point
