Deif Multi-line 2 User Manual

AGC Designer’s Reference Handbook
DEIF A/S Page 91 of 168
Master clock
The purpose of the master clock is to control the frequency of the gen-set in order to obtain the
correct number of periods.
In a 50Hz system one period lasts 20 ms. If this changes, e.g. due to the dead band setting of
the frequency controller, a difference will exist between the actual number of periods and the
theoretical number of periods.
Equipment that works based on the zero crossings will be affected by the surplus or missing
zero crossings. The most common example of such equipment is alarm clocks.
The unit’s internal clock is a timekeeper which is included in the battery backed memory circuit.
The timekeeper function works based on an oscillating crystal instead of zero crossings of the
AC measurements. Due to the accuracy of the timekeeper, it is recommended to synchronise
the clock on a regular basis, e.g. once every month.
Setting Description Comment
6401 Start Start time. The compensation period starts at the
adjusted time.
6402 Stop Stop time. The compensation period stops at the
adjusted time.
6403 Difference The setpoint in seconds
that initiates the compen-
sation.
6404 Compensation Frequency difference when
the compensation is ini-
tiated.
+/- value.
6405 Enable Enables the function.
Compensation time
The time for the compensation can easily be calculated at a given adjustment of 6403 and 6404
(example):
• 6403 = 30 seconds
• 6404 = +/- 0.1Hz
This function can only be used, if island operation is selected.
If the power management option is selected (option G5), then the adjustment is
made in the command unit.
hoursst
HzHzst
fftt
TOTAL
TOTAL
DIFFNOMSETTOTAL
1,4~15030
)1,50/501/(30
)/1/(
=
−=
−=
The compensation frequency must be adjusted to a value higher than the dead
band setting.

Deif Multi-line 2 Specifications

General

Brand	Deif
Model	Multi-line 2
Category	Controller
Language	English