ABB UNITROL 1020 - Page 57

 Chapter 3 - Device Overview
UNITROL 1020 User Manual 3BHS335648 E82 49
SYNC
DisableCBCheck
[True / False]
When set to False (default), this enables the monitoring of Gen
CB Closed Status input during Synchronization (only): if Gen CB
Closed Status is active, Voltage Matching is not performed.
When set to True, this disables the monitoring of Gen CB Closed
Status during Synchronization (only): Voltage Matching is
performed disregarding the Gen CB Closed Status input (not
recommended in most applications).
Important: This parameter must be configured to False for
backwards compatibility with releases 4.401 or earlier.
IMPORTANT!
After the power circuit breaker has been closed, the Synchronize
command must be deactivated.
The setpoint of the speed controller must have the nominal value of 50
resp. 60 Hz for the synchronization.
Examples
Voltage matcher
The machine voltage is raised to the level of
the line voltage.
Ramp Rate has to be adjusted in the menu
Setpoint AUTO
Frequency matcher
fNOM = 50 Hz
(45 Hz < fNET ≤ 54 Hz, 50 Hz)
(54 Hz < fNET < 66 Hz, 60 Hz)
fNET = 49 Hz
fM = 50 Hz
fSP = 50 Hz (Setpoint speed governor)
Slipmax = -0.4 Hz
Slipmin = 0 Hz
Fbias =
f
NET
– f
NOM
– (Slip
MAX
– Slip
MIN
)/2- Slip
MIN
= -0.8 Hz
fSP+Fbias = 49.2 Hz
UNET
UM
98
100
103
[%] Setpoint AUTO
Ramp = constant
90
110
Maximum
Minimum
50
49
[Hz]
fNOM
fNET
49.2
[Hz]
+1
-1
Fbias
+0.2
+0.2
Using digital output signals to adjust the speed:
As an alternative to the fbias signal, UNITROL 1020 also supports increase and decrease
signals as digital outputs in order to adjust the speed. The digital outputs are pulse width
modulated with 4000 ms base time. The more the machine frequency matches the
network frequency, the shorter the pulses are.