Winco DGC-2020 - Manual (Page 117)

A Pickup: Adjustable from 5 to 100 Vac in 1 Vac increments.
B Activation Delay: Adjustable from 0 to 30 s in 0.1 s increments.
C Alarm Configuration: None, Alarm, Pre-Alarm, or Status Only.
D Hysteresis: Adjustable from 1 to 5 Vac in 1 Vac increments.
Frequency Protection (81O/U)
Two sets of frequency protection settings are provided: one for underfrequency (81U) and one for
overfrequency (81O).
Underfrequency (81U)
An underfrequency condition is annunciated when the generator frequency decreases below the 81U
pickup setting
A for the duration of the 81U activation delay setting B . An underfrequency annunciation can
be user-selected to trigger a pre-alarm C (warning) or alarm C (shutdown). An underfrequency annunciation
can also be user-configured to close a programmable output.
A voltage-based inhibit setting
D prevents an 81U trip from occurring during an underfrequency condition
associated with system startup.
The hysteresis setting
E functions as an underfrequency dropout by preventing rapid switching of the
pickup output.
Overfrequency (81O)
When the generator frequency increases above the 81O pickup setting
F for the duration of the 81O
activation delay setting G , an overfrequency condition is annunciated. An overfrequency annunciation can
be user-selected to trigger a pre-alarm H (warning) or alarm H (shutdown). An overfrequency condition can
also be user configured to close a programmable output.
The hysteresis setting
I functions as an overfrequency dropout by preventing rapid switching of the pickup
output.
The element is disabled when Alarm Configuration is set to “None”. Element status is available in
BESTlogic+ Programmable Logic when “Status Only” is selected.
BESTCOMSPlus frequency protection settings (DGC-2020, Generator Protection, Frequency) are
illustrated in Figure 4-44.
Figure 4-44. Frequency Protection Settings
A Underfrequency Pickup: Adjustable from 45 to 66 Hz in 0.1 Hz increments for 50/60 Hz controllers
(style number x1xxxxxxxx). Adjustable from 360 to 440 Hz in 0.1 Hz increments for 400 Hz controllers
(style number x2xxxxxxxx).
B Underfrequency Activation Delay: Adjustable from 0 to 30 s in 0.1 s increments.
C Underfrequency Alarm Configuration: None, Alarm, Pre-Alarm, or Status Only.
D Underfrequency Inhibit Volts: Adjustable from 70 to 576 Vac in 1 Vac increments.
E Hysteresis: Adjustable from 0.1 to 40 Hz in 0.1 Hz increments.
F Overfrequency Pickup: Adjustable from 45 to 65 Hz in 0.1 Hz increments for 50/60 Hz controllers (style
number x1xxxxxxxx). Adjustable from 360 to 440 Hz in 0.1 Hz increments for 400 Hz controllers (style
number x2xxxxxxxx).
G Overfrequency Activation Delay: Adjustable from 0 to 30 s in 0.1 s increments.
9400200990 Rev K DGC-2020 BESTCOMSPlus Software 4-47