Datakom DKG-705 - 6. SYNCHRONIZING WITH MAINS; 6.1 Governor Control

DATAKOM DKG-705 User’s Manual
705_USER.doc - 20 -
6. SYNCHRONIZING WITH MAINS
The DKG-705 offers the possibility of synchronizing the genset with the mains.
The synchronization comprises frequency, phase and voltage matching features.
The synchronization properties of the unit are adjusted with program parameters.
These parameters are reserved for factory and qualified installation
personal use and must not be modified by end users or non-qualified
service personal. Otherwise severe damage may occur!
6.1 Governor Control
The frequency and phase matching is made by controlling the engine’s governor module. The
DKG-705 compares the mains phase R with the genset phase U. If the engine does not have a speed
governor it is not possible to make frequency or phase control.
The GOV output (terminal 45) is an analog voltage output of 0-10 VDC. The output impedance is
180 ohms.
The functions of the GOV output are controlled by programmed parameters:
P_A02 GOV Control Enable: This parameter enables/disables the activation of the governor control
output. If governor control is disabled, the output will always stay at the rest level defined by P_A13.
P_A03 GOV Reverse Polarity: In normal polarity, the governor control voltage increases in order to
increase the engine speed. If reverse polarity is selected the governor control voltage decreases in order to
increase the engine speed.
P_A13 Governor Start: This is the rest value of the governor control output. Always set this value to 128,
which is the mid-course, and then adjust the engine speed from the speed governor. However, if needed,
engine speed adjustment may be made through this parameter. Do not forget that, if this parameter is
modified, the adjustment range will be reduced.
P_A15 Frequency Lock Gain: This parameter defines the reaction speed of the governor output to phase
differences between genset and mains phases during synchronization. The standard value for this
parameter is 32. But it must be readjusted for the engine during manufacturing. If this parameter is too
high, a phase oscillation may occur. If it is too low, the phase locking will have a lazy behavior.