9492600990 10-9
DECS-150 Grid Code
Figure 10-8. Reactive Power Q(U) Characteristic Curve
In the event of a remote communications failure while in Q(U) mode, the controller may continue
operating in Q(U) mode using the last valid value for U
Q0
/ U
C
received over communications, or switch to
Q(PF) operation with a PF of 1.0. The network operator may also arrange a switch to one of the other
Reactive Power control modes instead.
Adjustment Sources
The Q(U) setpoint may be adjusted by the DECS-150 auxiliary input or via remote communication
(Modbus
®
). For all adjustment sources, the value of the Q(U) Gain setting is applied to the value read
from the selected input. Refer to the Modbus Communication section for more information on adjusting
the setpoint via remote communication.
Auxiliary Input
To use the DECS-150 auxiliary input as the Q(U) adjustment source, make the following settings:
• On the Auxiliary Input screen, set the Input Function setting to Grid Code Input. Refer to the
Auxiliary Control section for details.
• On the Active Power Control screen, set the Adjust Source setting to Auxiliary Input.
Refer to the Auxiliary Control section for details on how the auxiliary voltage (Vaux) is calculated.
Vaux is multiplied by 0.01 and the value of the Q(U) Gain setting:
(APC Adjust = Vaux x 0.01 x Q(U) Gain).
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