Step Time Control allows relays to be used to
control a device, such as a motorised valve or
gate, in order to maintain the level within two
predetermined points. Relays will energise
“ON” when Step Time condition is in effect
and de-energises “OFF” when Step Time
goes off. One relay will be required to control
an increase in level, (‘open’ the device) and a
second relay is required to control a decrease
in level, (‘close’ the device). Alarm ID
(P212, 222, 232, 242, 252) is used to assign
the relay to control either the open or close
condition. Step Time Control relay requires
three setpoints. The first set point (P213, 223,
233, 243, 253) determines the level, at which
the relay is to be activated, (N.B. level
setpoint for open relay, increase the level,
must be lower than the setpoint for the close
relay, decrease the level). The relay will
energise “ON” after the Limit time that is set
in Relay Setpoint 3 (P215, 225, 235, 245,
255). And turns “OFF”, de-energises, after
the Drive Period that is set in Relay Setpoint
2 (P214, 224, 234, 244, 254).
Relay will energise “ON” when a differential
condition is in effect and, de-energise “OFF”
when the differential conditions cease. Two
setpoints are required, Differential control
“ON”, (P213, 223, 233, 243, 253) and
Differential control, “OFF” (P214, 224, 234,
244, 254).
This allows the relay to be used to activate a
device as a result of a differential level,
between two points e.g. operate a rake on a
screen.
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