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VFC 3210
Overexcitation braking
This function is used to obtain an optimized braking performance of the fre-
quency converter in V/f control mode. To realize this function, increase 'Convert-
er output voltage' by fine tuning of parameter E0.55 'Overexcitation braking fac-
tor' during deceleration process.
Code
Name
E0.55 Overexcitation braking factor
When [E0.55] = 1.00, 'Overexcitation braking' is inactive.
●
A higher factor brings a higher braking force.
●
However, an excessive high factor may trigger errors of overcurrent (OC-1,
OC-2, OC-3), converter overload (OL -1), motor overload (OL -2), or surge cur-
rent / short circuit (SC). Reduce the setting of the factor in such cases.
Automatic voltage stabilization
Code
Name
Automatic voltage stabiliza-
C0.10
tion
Automatic voltage stabiliza-
C0.11
tion reference voltage
C0.10 = 0: Constant voltage control is enabled, the converter will automatically
control the output voltage within motor rated voltage, and the output voltage
will not be higher than motor rated voltage.
C0.10 = 1: Constant voltage control is disabled, then the output voltage will be
in direct proportion to the input voltage.
Output voltage might higher than motor rated voltage.
C0.10 = 2: Constant voltage control is disabled during deceleration. This func-
tion can effectively reduce the 'OE' error for fast deceleration application.
In some application which require quick stop, automatic voltage stabilization
function should be closed (C0.10 = 1 or 2). In this case the motor is in genera-
tion mode, braking torque produced by regeneration voltage will be helpful for
the motor quick stop, so that over voltage error can be avoided, then in deceler-
ation process, when DC-bus voltage is higher than the reference voltage set by
C0.11, the output voltage will be higher, but it may cause motor overheat.
C0.11 is only active when constant voltage control is disabled and in decelera-
tion process.
DOK-RCON04-VFC3210****-IT01-EN-P
Setting range
1.00...2.00
Setting range
0: Always active
1: Always inactive
2: Inactive only during decelera-
tion
1P 200 VAC: 180...264 V
3P 400 VAC: 323...528 V
Bosch Rexroth AG
Functions and Parameters
Default
Min.
1.10
0.01
Default
Min.
0
-
220
1
380
Attri.
Run
Attri.
Stop
Stop
119/253
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