NEGATIVE slip frequency
LOAD
0% 100%
FUEL INDEX
0% 100%
FUEL INDEX
G1
G2
P
Gen1
P
Gen2
Reverse power
GB
GB
5.2.3 Adjustments
The dynamic synchroniser is selected in menu 2000 Sync. type in the control setup and is adjusted in menu 2020 Synchronisation.
Setting
Description Comment
"Sync df
MAX
" (channel 2021) Maximum slip frequency
Adjust the maximum positive slip frequency where
synchronising is allowed.
"Sync df
MIN
" (channel 2022) Minimum slip frequency
Adjust the maximum negative slip frequency where
synchronising is allowed.
"Sync dU
MAX
" (channel 2023)
Maximum voltage difference (+/-
value)
The maximum allowed voltage difference between the busbar/
mains and the generator.
"Sync dU
MIN
" (channel 2024)
Minimum voltage difference (+/-
value)
The minimum allowed voltage difference between the busbar/
mains and the generator.
"Sync t
GB
" (channel 2025) Generator breaker closing time Adjust the response time of the generator breaker.
"Sync t
MB
" (channel 2026) Mains breaker closing time Adjust the response time of the mains breaker.
The speed of the slip frequency is determined by two settings, "Sync df
MAX
" and "Sync df
MIN
". The calculation from the examples
below illustrates why it is important to configure the slip frequency speed correctly.
Example 1
The slip frequency speed of the genset is 0.15 Hz faster than the frequency of the busbar or the grid that the genset is trying to
synchronise to.
This means that the phase angle difference between the genset and the busbar or the grid will decrease and eventually be within the
GB closing window.
Example 2
This means that the phase angle difference between the genset and the busbar or the grid will not decrease. In this example, the
genset will never reach the GB closing window because it will never catch up on the grid or the busbar.
It is obvious that this type of synchronisation is able to synchronise relatively fast because of the adjusted minimum and maximum
slip frequencies. This actually means that when the controller is aiming to control the frequency towards its set point, synchronising
can still occur as long as the frequency is within the limits of the slip frequency adjustments.
DESIGNER'S HANDBOOK 4189341275A EN Page 87 of 196
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