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Fault On Aucom Ems Soft Starter


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#1 flash

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Posted 16 June 2011 - 05:58 AM

I have the problem not knowing what stops our mixer (is it due to a starter fault or in the mixer control circuit). When the mixer stops all power is removed for the soft start controls so power is lost to the control/fault circuit. The starter does not appear to have a battery backup on the alarm circuit or a battery PCB connected.

Is there an easy way to fit a fault lamp or be able to obtain battery backup cards?

Another method maybe to connect a relay to the normally open fault contact and this may make contact long enough to latch. Is the normally open fault output a clean contact and at what voltage is it rated at?

Thanks

#2 marke

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Posted 16 June 2011 - 10:43 AM

Hello flash

Welcome to the forum.
This is a pretty old starter and depending on the pcb version, there may be some coloured LEDs along one edge.
If there are coloured LEDs, then you can keep the trip indication by keeping power on the pcb.
The enclosed units as they were sold, included a DOL starter minus overload relay with the trip relay connected to open the contactor.
Once the contactor was opened, power was removed from the coil control and also from the transformer.
If you rewire the transformer primary so that it is not disconnected if the starter trips, then it will retain the trip information.
You would need to power down the transformer to reset.
If you are using two wire control, then keep the transformer powered while there is a run signal.
If you are using push buttons, (3 wire control) then wire the buttons to control a relay with self hold contactor and use the relay to control the transformer with the trip contacts in series with the contactor coil.

Does that make sense?
There was an alarm interface module available (many years ago and this included a back up battery) to hold up the alarms but this has not been available for many years.

Best regards,
Mark.

#3 Gigger

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Posted 16 June 2011 - 08:15 PM

I have the problem not knowing what stops our mixer (is it due to a starter fault or in the mixer control circuit). When the mixer stops all power is removed for the soft start controls so power is lost to the control/fault circuit. The starter does not appear to have a battery backup on the alarm circuit or a battery PCB connected.

Is there an easy way to fit a fault lamp or be able to obtain battery backup cards?

Another method maybe to connect a relay to the normally open fault contact and this may make contact long enough to latch. Is the normally open fault output a clean contact and at what voltage is it rated at?

Thanks


Hi Flash,
The EMS control is fed from the load side of the line contactor so when a trip occurs the line contactor opens and hence you loose control power,what I have done in the past is to change the control feed from the load side of the contactor to the line side so that a trip will open the contactor but keep control power on.
Cheers,
Gigger.




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