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Manual 37615C
SPM-D2-10 - Synchronizing Unit
© Woodward
Page 33/68
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 control is only designed to oper-
ate one circuit breaker.
2
Gen CB Free
Color: green
Enable power circuit breaker
The LED "Gen CB Free" indicates that the power circuit breaker has been
enabled for operation. The status of the LED illuminates when the discrete
input "Enable/Release CB" is energized.
3
Automatic
Color: green
Automatic mode
The LED "automatic" is illuminated when the unit is in automatic mode. It
will turn off as soon as the control unit is switched to the configuration mode.
4
CB close
Color: green
CB close
The "CB close" LED illuminates when the unit outputs a closure command
to the power circuit breaker during synchronization. The "CB close" LED il-
luminates when the relay "command: close CB" is energized.
5
LED-row:
too fast
Color: red/yellow/green
Phase position / Synchroscope
The row of LEDs indicates the current phase relationship between the two
voltages indicated in the display. The green LED in the center of the 15 LEDs
indicates that the measured phase angle between the voltage systems is +/-
12 ° electrical. The phase position is only displayed if the controller is in au-
tomatic mode, if the difference between the frequency differential of the two
measured systems is less than 2 Hz and the voltages of both systems are with-
in the specified permissible ranges. These ranges are defined as follows:
Frequency ranges
Generator and mains
80 to 110 % f
N
Voltage ranges
Generator and mains
50 to 125 % V
N
The synchroscope LEDs can move in two directions:
left
right
. If the LEDs illuminate from left to right, the generator (variable
system) frequency is higher than the mains or reference voltage
system (i.e. the generator or the variable system has a frequen-
cy of 60.5hz and the mains is 60hz).
right
left
. If the LEDs illuminate from right to left, the generator (variable
system) frequency is lower than the mains or reference voltage
system (i.e. the generator respectively the variable system has a
frequency of 59.5hz and the mains is 60hz).