supplies. Each sensor is individually programmable for pickup and dropout frequency set points
(i.e. adjustable hysteresis) in addition to transient time delay settings. To program the voltage
and frequency sensing features, refer to the following descriptions: Note: each of the following
set points are programmable for each source (e.g. Utility -Source 1 and Generator - Source 2).
5.13.1. UNDER VOLTAGE DELAY (DROPOUT)
Select the desired source under voltage time delay setting. The setting is entered in
seconds. If no delay is required, set this time delay to zero.
5.13.2. UNDER VOLTAGE DROPOUT
Set to the desired source under voltage drop out set point as expressed in percentage
of nominal system voltage. The dropout set point is the value which the internal sensor
de-energizes to an abnormal state when any one phase of the source falls below the set
point. An under voltage condition will be triggered following expiry of the under voltage
time delay setting.
5.13.3. UNDER VOLTAGE PICKUP
Set to the desired source under voltage pick-up set point as expressed in percentage of
nominal system voltage. The pick-up set point is the value which the internal sensor
energizes to a normal state when all phases of the source rise above the set point.
5.13.4. OVER VOLTAGE DELAY (PICKUP)
Select the desired source over voltage time delay setting. The setting is entered in
seconds. If no delay is required, set this time delay to zero.
5.13.5. OVER VOLTAGE DROPOUT
Set to the desired source over voltage drop out set point as expressed in percentage of
nominal system voltage. The dropout set point is the value which the internal sensor de-
energizes to a normal state when all phases of the source falls a below the set point.
5.13.6. OVER VOLTAGE PICKUP
Set to the desired source over voltage pick-up set point as expressed in percentage of
nominal system voltage. The pick-up set point is the value which the internal sensor
energizes to an abnormal state when any one phase of the supply rises above the set
point. An over voltage condition will be triggered following expiry of the over voltage time
delay setting.
5.13.7. PHASE UNBALANCED VOLTAGE LATCH
When the phase unbalance latch feature is enabled, this programming prompt will affect
operation of the retransfer sequence following an abnormal phase balance condition.
Two retransfer modes of operation are selectable as follows:
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