SLM
102 – Operational Manual
TRINITY
[60]
All relays, from 1 to 4 are programmable with the following parameters, Avg. Volts,
Avg. Amps, KVA, KW, KVAR, Demand and PF. 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 KW exceeds 450 and remains so for 1
minute. All parameters have this response time of 1 minute, except Demand which
has a response time of 2 seconds. This is because Demand is already an integrated
parameter.
Also, the switching ON logic in case of 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. when the second alarm is set for PF and alarm
Value is set to 955, the relay should close when the PF value falls below 0.955
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. E.g. If
the Value has been set to 400, and Hysteresis to 5%, the relay will close when the
parameter reaches 400 and then, the relay opens when it falls below 380. The
response times as outlined above for closing of relays also applies to opening of
relays. Thus, the relay will open at 380 only if the parameter falls below 380 and
remains so for 1 minute (2 seconds in case of Demand).
If all four relays are programmed to close on Demand and different values for closing
and opening are set by the user, SLM102 can be used effectively as a Maximum
Demand Controller with four relay contacts!
SLM102 as a Demand Management
Each relay can be programmed separately to generate alarm on a specific
parameter with its specific value. The value at which it should open is also
programmable. Thus, user could have the first relay programmed to close when the
avg. Voltage exceeds certain value, second when the Avg. Amps exceeds some
level, third for KW, or KVAR or PF or Demand and so on. Before programming the
relays, having a look into Run Mode for Predictive Demand value is true for Demand
Management.
This allows the user to deploy
SLM102 as a true Demand manager
, to generate
alarm signals for four different conditions!
