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92
Operation Techniques
The setpoint remains operated until the parameter that triggered the setpoint reverts
to its release limit. While the trigger parameter is in the band between its operate and
release limits (dead band), the setpoint will remain operated.
When release conditions are fulfilled, i.e., all trigger parameters are behind their
release limits (high current
≤
1450 A, and both power factors
≥
0.9), the setpoint is
triggered for release. If for the following 5-second interval, the release conditions do
not change, the setpoint is released. If relay #1 is not operated by another setpoint, it
will be deactivated. No other actions will be made.
Using Logical Triggers
Example 4-2
illustrates usage of logical triggers for setpoint operation. The setpoint
monitors status input #5, and records predefined parameters in data log partition #2
(the set of parameters should be specified for the partition separately) on each new
maximum block kW demand occurrence while status input #5 remains asserted. No
delays are used. For clarity, unused conditions and actions are not shown.
Note that discrete input #5 should be configured as a status input for the setpoint to
be operated.
Example 4-2 Sample Of Using Logical Triggers
Trigger conditions
Conjunction
Trigger parameter
Condi-
tion
Operate
limit
Release
limit
Condition #1
OR
Status input #5
ON
Condition #2
AND
Block kW demand
NEW
Setpoint actions
Delays
Action type
Action target
Unit
Operate Release
Action #1
Data logging
#2
0.1 s
0
0
Using Pulse Triggers
The following example shows a simple usage of input pulses to produce an
extended pulse of a predefined duration through relay output #1 (see
Example 4-3
).
On each incoming pulse, relay #1 will be operated for 1 second. Discrete input #1
must be configured as a pulse input to allow the setpoint to be operated.