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I have two ION7650 on 11kV supplies.
My client wants to know when a sag or swell waveform capture has occured in the meter by receiving a notification in the site BMS using a Modbus register as the trigger.
Using Designer, I have looked at a Modbus Slave module linked to the output of the Sag/Swell module (DistState) to change the value in the slave register from 0 to 1 (Packed Boolean). Will the Manual Waveform Trigger in PME simulate an output on the Sag/Swell module?
Is this the best way to go about this or is there a better solution?
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Hi
A manual waveform trigger won't stimulate a sag/swell output, but one idea would be to pulse merge a manual waveform trigger with the sag/swell output and link that to a counter module. The counter module output can then be exposed to modbus which helps prevent any sags/waveforms being missed by a polling approach (the counter is the absolute number of changes).
BR
Tom
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One way I have also seen this done is linking the Sag/swell count to a modbus register, then BMS system is configured to recognize a change in value to indicate a sag or swell. Another option would be to link the sag/swell end pulse to a one shot timer that can then be linked to a mobus register. Oneshot period would have to be greater than the modbus polling period. The sag/swell state could change values so fast the modbus poll could miss the event.
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Hi
A manual waveform trigger won't stimulate a sag/swell output, but one idea would be to pulse merge a manual waveform trigger with the sag/swell output and link that to a counter module. The counter module output can then be exposed to modbus which helps prevent any sags/waveforms being missed by a polling approach (the counter is the absolute number of changes).
BR
Tom
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One way I have also seen this done is linking the Sag/swell count to a modbus register, then BMS system is configured to recognize a change in value to indicate a sag or swell. Another option would be to link the sag/swell end pulse to a one shot timer that can then be linked to a mobus register. Oneshot period would have to be greater than the modbus polling period. The sag/swell state could change values so fast the modbus poll could miss the event.