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SLM
102 – Operational Manual
TRINITY
[22]
Alarm On
There are seven alarm parameters: Avg. Volts(
VOLT
), Avg. Amps(
AMPS)
, KVA(
VA
),
KW(
VATT
), KVAR(
VAR
), Demand(
DMD
), PF(
PF
) and None(
NONE
). These parameters
are programmable for each alarm relay according to user’s requirement. In case, any
Alarm parameter is not desired, NONE should be selected.
Alarm Value
Alarm values are freely programmable from 1 to 9999. In case of VOLT, the value is
freely programmable from 1 to 99999. The value indicates the level at which the
relay will close. E.g. If the Alarm On has been selected to KW, and the value is set to
450, the relay will close when the KW exceeds 450 and remains so for 1 minute.
Also, the switching ON logic for PF is reversed. For all parameters, the relay closed
when the parameter value
exceeds
that defined by Value for more than one minute.
In case of PF however, the relay will close when the PF
falls
below the Value and
remains so for more than one minute. Also, the PF Value is entered with a
multiplication factor of 1000. e.g. If Second Relay is programmed for which ALARM
ON is set to PF and ALARM VALUE is 955, then the second relay should close when
the PF value falls below 0.955.
Alarm Hysteresis
The last parameter called Hysteresis defines the opening point for the relay which
has closed in response to an alarm condition. This is specified as % of the Value.
Thus, setting Hysteresis of 2 implies that the relay which closes when the parameter
reaches Value, will open when the parameter falls below 0.98 x Value. This is done
to prevent frequent operation / nuisance operation of the relay near the Value.
To set the Alarm Parameters, proceed the following instructions.
1. In the previous programmable parameter display, press
key till the next
display enters such as shown below.