Manual 37259C
SPM-D11 - Synchronizing Unit
© Woodward
Page 23/79
Control Inputs
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Release CB
Terminal 3
•
Terminal 6 = "Release control"
A signal into this discrete input enables operation of the power circuit
breaker. For tests during commissioning, ensuring that no voltage is ap-
plied to this input will prevent the power circuit breaker from operating,
even if the control functions are enabled.
•
Terminal 6 = "Set point power"
A signal into this discrete input enables the operation of the breaker and
the control functions.
Reply:
CB is open
Terminal 4
The status of the CB must be transmitted to the unit through this input. The
input must be energized if the CB is open. The status of this input is checked
for its plausibility and is signaled with the LED "Gen CB - ON".
Enable: Isolated opera-
tion/dead bus start
Terminal 5
Energizing this input when the breaker is open enables a dead bus start. En-
ergizing this input when the breaker is closed enables the frequency and
voltage controllers for isolated operation or load sharing control.
Enable control
Enable Pset 2
Terminal 6
If
"terminal 6 = Release control"
is energized,, the frequency and voltage
controllers are enabled by energizing this input. For tests dur-
ing commissioning, ensuring that no voltage is applied to this
input will prevent the power circuit breaker from operating,
even if the control functions are enabled.
If "
terminal 6 = Set point power
" is energized, the second set point value
or the set point value via analog input is enabled.
Isolation of the Power Supply from the Discrete Inputs
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NOTE
Please observe the notes about the maximum voltage ratings in the section Discrete Inputs on page 14!
By means of appropriate external wiring, the common reference point of the discrete inputs (terminal 7) can be
galvanically separated from the supply voltage (0 V, terminal 2) . This is necessary, for instance, if the discrete
inputs are not to be controlled with +24 Vdc and a galvanic separation of the control voltage (e. g. 220 Vdc,
220 Vac) from the supply voltage needs to be ensured.
Wiring should be made as follows:
•
Reference points connected with 0 V
Jumper between terminal 7 and terminal 2 (0 V)
•
Reference point of the discrete inputs potential-free:
Terminal 2: 0 V (supply voltage)
Terminal 7: 0 V or N (control voltage)
