XPERT-PRO – Operational Manual
TRINITY
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Control Outputs
The relay contacts are rated 3A@230 VAC of which the two relays are
programmable for the various alarm parameters according to your requirements.
Hence, the relays are protected by snubbers against fast voltage transients occurred
when inductive loads are switched off.
Thus, the following points are to be taken care of when using these relay contacts:
•
Use 230V AC coils only in the contactors. DO NOT use 440V AC coils.
•
DO NOT switch small loads like electronic Hooters, small relays with 230V AC
coils etc., directly from the relay contact of XPERT-PRO. If done so, the small
leakage current from the snubbers will not allow these loads to be switched off
fully. Thus, the electronic hooters will give a low hum continuously, and the small
relays will switch on but not switch off.
•
Use these relay contacts to switch an Auxiliary contactor and put the load on the
contactor contacts.
Relays for Alarm Action
The relays can be programmed to operate for Alarm/Trip functions. Each relay is
independently programmable for the parameter on which to operate, time delay
before operation, and values for the operation to be triggered and released values.
The two relays for alarm parameters should, therefore be programmed at site such
as shown below.
SL
NO.
Alarm Relay 1
SL
NO.
Alarm Relay 2
1.
K1 VAL:200
4.
K2 VAL:98
2.
K1 ON:KVA
5.
K2 ON:PF
3.
K1 TIME:060
6.
K2 TIME:120
In order to program alarm parameters for one or two relays, user can select any one
of the following parameters: Avg. Volt [(Vry+Vyb+Vbr)/3], Avg. Amps [(Ir+Iy+Ib)/3],
KVA, KW, KVAR, DMND (demand), and PF.
For example, in case of Alarm Relay 1, the parameter is set to KVA; the value for
operating the relay is programmed to 200 and the time delay is set to 60 seconds.
The relay will, thus operate when the KVA crosses 200, and stays more than 200 for
60 seconds continuously. The relay will now open when the KVA falls below 190,
and stays for 60 seconds continuously. That is why a band (hysteresis) of 5% is
added to the programmed value.
