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Manual 37618A
Shutdown
If the parameter "Download and open GCB" has been configured as "ON", the controller can be configured to
perform a shutdown function in the following manner:
Terminal 3 "Enable CB" is de-energized, initiating the shutdown
The power will be reduced according to the setting configured in "Power controller ramp" (refer to section
Power Set point Value on page 55)
When the real power falls below 10 % of the generator rated power, the relay "Command: open CB" will open
Mains Parallel Operation
In mains parallel operation both circuit breakers are closed and the real power and the power factor cos phi are
controlled to the configured set point values, provided that the controllers are configured to enabled. If the param-
eter "terminal 6 = Release control" is set, terminal 6 must also be energized, so that the controllers operate.
Selection of the power set point value
If the generator is connected in parallel with the mains via the CB, initially a partial load is assumed.
When the partial load pre-run is completed (or deactivated) the following table is valid for the selection of the
power set point mode:
Parameter
"Terminal 6"
Release control
Set point power
0: "OFF" / 1: "ON" / x: Signal of no significance (0 or 1)
If an external signal has been selected for the parameter "Power set point external", the correct signal type
must be selected on the following configuration screen.
The power set point upper limit must be configured as the value "Power controller P max"
The power set point lower limit must be configured as the value "Power controller P min"
The power set point has a configurable ramp rate. This slope can be configured in the parameter "Power con-
troller Ramp".
Load Sharing
The SPM-D2-11 is designed so that when several generators are operating in parallel (isolated operation) on a
common mains bus, the real power of the isolated system (in reference to the relevant rated load) is shared equally
among the generators.
Isolated/mains parallel operation. Each controller participating in load sharing influences the genset to which it
is assigned in such a manner that the preset rated frequency (main control variable) remains constant. All units are
interlinked via an analog signal against which any deviation in real power (generator power) can be determined
for each genset. This control variable (secondary variable) is taken into consideration in controlling the frequency.
The weighting, with which the secondary and the main control variable (= "reference variable") are processed,
can be set via a weighting factor (parameters "Act. load share Factor"). In settled state, the isolated system has the
set rated frequency, whereby the total real power (in reference to the relevant rated power) is subdivided equally
amongst those gensets involved.
Note – The frequency regulators of the generators must be suitably configured for parallel operation (i.e. droop
operation mode)
© Woodward
Condition
Parameter
"Terminal 6"
"Power set point ex-
ternal"
1
1
0
active set point value
ON
External: via 0 to 20 mA
OFF
Internal: Power controller Pset2
ON
External: via 0 to 20 mA
OFF
Internal: Power controller Pset2
x
Internal: Power controller Pset1
SPM-D2-11 - Synchronizing Unit
Table 5-4: Power set point modes
Page 27/83
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