Start With Speed Capture - Bosch Rexroth VFC 3210 Operating Instructions Manual

VFC 3210

Start with speed capture

This mode is used after transient power fault in applications with a large inertia
load. The frequency converter firstly identifies the rotation speed and direction
of the motor, and then starts with the current frequency of the motor to realize
smooth starting without shock to the rotating motor.
Code Name
Speed tracing voltage recov-
E0.42
ery ratio
Speed tracing deceleration
E0.43
time
E0.42 Sets the time ratio for the drive to restore the output voltage to the level
specified by the V/f mode after speed tracing. The larger setting value is, the
faster voltage recovery is. But the setting value is too large will cause an overcur-
rent. In the low-power converter this value can be set larger, in the high-power
converter this value should be set smaller.
E0.43 is the deceleration time that set speed tracking action. Please set the de-
celeration time from the highest output frequency to the lowest output frequen-
cy.
Fig. 12-21: Start with speed capture
When the frequency converter is starting and accelerating, if 'Setting
frequency' is lower than [E0.36] 'Start frequency', the frequency
converter firstly starts at 'Start frequency' and runs for [E0.37] 'Start
frequency holding time', and then decelerates to 'Setting frequency'.
DOK-RCON04-VFC3210****-IT01-EN-P
Setting range
0...20
0.5...20.0 s
Bosch Rexroth AG
Functions and Parameters
Default Min.
10 1
2.0 0.1
Attri.
Stop
Stop
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