Manual 37143A
MFR 15 - Protection Relay & Control
© Woodward
Page 49/119
No-Load Control
Aut.idle running
control ON
Automatic no-load control
ON/OFF
ON
................ With the power circuit breaker open and terminal 3 de-energized (CB
disabled), frequency and voltage is controlled if the minimum per-
missible generator frequency and voltage have been reached.
OFF
.............. With the power circuit breaker open, frequency and voltage are con-
trolled according to the following conditions:
•
Terminal 3 energized (CB enabled):
Frequency and voltage are controlled
•
Terminal 3 de-energized (CB disabled):
Frequency and voltage are not controlled
Frequency Controller (
Option Y
/
G
/
GF
)
Freq. controller
ON
Automatic no-load control
ON/OFF
ON
................ The generator frequency may be controlled. The generator frequency
is controlled dependent upon the state of the relevant discrete inputs
(isolated operation / synchronization). The subsequent screens of this
function are displayed.
OFF
.............. The generator frequency is not controlled. The subsequent screens of
this function are not displayed.
Freq. controller
Setp. variable
(with
Option G/GF
only)
Presetting for frequency set point
variable/fixed
Fixed
............ The set fixed set point is continuously adjusted. An external correc-
tion of the set point via actuating signals "higher" or "lower" is not
possible.
Variable
....... The set point can be externally corrected within certain limits.
Set Point Setting
Freq. controller
Setpoint 00,0Hz
Frequency controller – set point
48.0 to 62.0 Hz
The generator frequency set point is defined in this screen. This value is the refer-
ence for the frequency controller when performing isolated and/or no-load opera-
tions. Generally 50 Hz or 60 Hz will be the values entered into this parameter. It is
possible that a different value may be entered here.
Freq. controller
min.value OO,0Hz
Set point "variable"
(only with
Option G
/
GF
)
Lower limit for variable frequency set point value
48.0 to 62.0 Hz
The set value indicates the minimum set point that can be reached with an external
set point selection via the actuating signal "lower". The smaller frequency set point
value should be entered here.
Freq. controller
max.value OO,0Hz
Set point "variable"
(only with
Option G
/
GF
)
Upper limit for variable frequency set point value
48.0 to 62.0 Hz
The set value indicates the maximum set point that can be reached with an external
set point selection via the actuating signal "higher". The larger frequency value
should be entered here; otherwise, the assignment of terminals 74 and 75 ("higher"
and "lower") is reversed.