Generator Underfrequency (Level 1 & 2) Ansi# 81U - Woodward easYgen-2000 Series User Manual

ID Parameter
1900 Monitoring
1906
1904 Limit
1910
1905 Delay
1911
1901 Alarm class
1907
1902 Self acknowl‐
edge
1908
1903 Delayed by
engine speed
1909
4.4.1.3 Generator Underfrequency (Level 1 & 2) ANSI# 81U
General notes
37535B
Configure Monitoring > Generator > Generator Underfrequency (...
CL Setting range Description
[Default]
2 [On]
Overfrequency monitoring is carried out according to the following parame‐
ters. Monitoring is performed at two levels. Both values may be configured
independent from each other (prerequisite: Level 1 limit < limit 2).
Off Monitoring is disabled for Level 1 limit and/or Level 2 limit.
2 50.0 to 140.0 % The percentage values that are to be monitored for each threshold limit are
defined here.
1904: [110.0 %]
If this value is reached or exceeded for at least the delay time without inter‐
1910: [115.0 %]
ruption, the action specified by the alarm class is initiated.
Notes
This value refers to the System rated frequency (parameter
2 0.02 to 99.99 s If the monitored generator frequency value exceeds the threshold value for
the delay time configured here, an alarm will be issued.
1905: [1.50 s]
1911: [0.30 s]
Notes
If the monitored generator frequency falls below the threshold (minus the hys‐
teresis) before the delay expires the time will be reset.
2 Class A/B/C/D/ Each limit may be assigned an independent alarm class that specifies what
E/F action should be taken when the limit is surpassed.
1901: [B]
1907: [F]
Notes
For additional information refer to
on page 587
2 Yes The control unit automatically clears the alarm if the fault condition is no
longer detected.
[No] The control unit does not automatically reset the alarm when the fault condi‐
tion is no longer detected.
The alarm must be acknowledged and reset by manually pressing the appro‐
priate buttons or by activating the LogicsManager output "External acknowl‐
edgement" (via a discrete input or via an interface).
2 Yes Monitoring for fault conditions is not performed until engine delayed moni‐
toring is enabled. The engine monitoring delay time (param‐
eter
parameters assigned this delay.
[No] Monitoring for this fault condition is continuously enabled regardless of engine
speed.
This controller provides the user with two alarm levels for generator
underfrequency. Both alarms are definite time alarms.
Monitoring for underfrequency faults is performed in two steps.
easYgen-2200/2500 | Genset Control
Ä Chapter 9.5.1 "Alarm Classes"
3315 Ä p. 239) must expire prior to fault monitoring being enabled for
Configuration
1750 Ä p. 94).
109