Manual 37259C
SPM-D11 - Synchronizing Unit
Page 34/79
© Woodward
LEDs
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1
Bus CB Free
here: non-functional
Color: green
Enable mains circuit breaker
NOTE
: This LED is non-functional, as this is a "One-power-circuit-breaker
configuration".
2
Gen CB Free
Color: green
Enable generator circuit breaker
The LED "Gen CB Free" indicates that the power circuit breaker has been
enabled for operation. The status of the LED corresponds to the status of the
discrete input "Enable CB".
3
Automatic
Color: green
Automatic mode
The LED "automatic" illuminates when the control is in automatic mode. It
will extinguish as soon as you switch to the configuration mode.
4
CB close
Color: green
CB close
The LED "CB close" illuminates when the control outputs a close command
to the power circuit breaker. The status of the LED corresponds to the status
of the relay "synchronizing pulse command: close CB.
5
LED-row:
too fast
→
Color: red/yellow/green
Phase position / synchroscope
The row of LEDs indicates the current phase position between the two volt-
ages indicated on the display. The green LED in the middle of the 15 LEDs
indicates that the measured phase angle between the voltage systems is less
than 12 ° electrically. The phase position is only displayed in the automatic
mode and only if the difference between the frequency values is smaller
than 2 Hz and both voltages are within the specified permissible ranges.
These ranges are defined as follows:
Frequency ranges
Generator and mains
80-110 % f
N
Voltage ranges
Generator and mains
50-125 % V
N
There are two different directions of rotation:
left
→
right
..If the LED's run from left to right, the generator frequency is
too high, i. e., the generator or the variable bus frequency is
too fast.
right
→
left
..If the LED's run from right to left, the generator frequency is
too low, i. e., the generator or the variable bus frequency is
too slow.
