Manual 35092
2301E-HT Hydro (Francis Turbines)
Woodward
28
Unload and Generator Breaker Open Commands
The 2301E-HT has a configurable input that can be used as an unload command. It has also a
configurable output that can be used as a generator breaker open command. When the unit is in parallel
with the grid in Baseload mode and an unload command is set the baseload reference starts lowering
slowly (configurable rate) in order to unload the unit. When the generator load reaches the load Unload
Trip Level (configurable) the control sets a generator breaker command, if a discrete input is programmed
with this function. It also send the generator breaker opening command if the load reference is at the
Unload Trip Level value and a maximum delay expires (configurable). When the generator breaker
opens, the unit stays isolated waiting for a stop command or a command to re-synchronize to the grid.
If the generator breaker command is issued and the generator breaker status is not open until a
configured time, then an alarm is generated.
Alarms and Shutdowns
Lock Out Tag Out
Use of this equipment by untrained or unqualified personnel could
result in damage to the control or the installation's equipment and
possible loss of life or personal injury. Make sure personnel using or
working on this equipment are properly trained.
The 2301E-HT monitors several control functions and issues an Alarm when something goes wrong with
a control parameter. When the control parameter(s) in question are crucial to the safe operation of the
unit, the control will issue a Shutdown and an Alarm.
All Alarms and Shutdowns are latched until the condition is cleared and the control is given a “Reset”
command. A reset command can be issued to the control through a configurable discrete input or
Modbus
. A reset is automatically issued during every “Start” command to the control.
The following is a list of conditions that result in an Alarm only:
Level Signal Failure
: If the Pond/Tail Level control input signal fails, this alarm goes TRUE.
Pond/Tail Level control mode is also disabled.
Remote Reference Signal Failure
: If the Remote Reference input signal fails, this alarm goes
TRUE. Remote Reference control mode is also disabled.
Speed Bias Signal Failure
: If the Synchronizer/Load Control input signal fails, this alarm goes
TRUE.
Minor/Small Gate Position Mismatch
: If the gate position does not match the control’s gate position
demand within the “Minor Mismatch Window” for the “Minor Mismatch Delay Time,” this alarm goes
TRUE.
Modbus Link Error
(unless calibrated as a shutdown): When a Modbus link error occurs, this alarm
goes TRUE.
Dirty Oil Switch Input Alarm
: If a discrete input is configured for the Dirty Oil Switch, this alarm will
go TRUE when the discrete input is closed.
Creep Detected
: When creep is detected, this alarm goes TRUE.
Breaker Open Time Exceeded
: When an open generator breaker command is issued and the
breaker does not open, this alarm goes TRUE.
Remote Baseload Signal Failure
: If the Remote Baseload input signal fails, this alarm goes TRUE.
Remote Baseload control mode is also disabled.
Gate Limiter Signal Failure
: If the Gate Limiter input signal fails, this alarm goes TRUE.
Remote Level Signal Failure
: If the Remote Level input signal fails, this alarm goes TRUE. Remote
Level control mode is also disabled.
Speed Signal #1 Failure
: When the speed signal #1 fails, this alarm will go TRUE
Speed Signal #2 Failure
: When the speed signal #2 fails, this alarm will go TRUE
Released
