Bosch Rexroth EFC 3600 Operating Instructions Manual page 71

DOK-RCON03-EFC-3600***-IT01-EN-P
Rexroth Frequency Converter EFC 3600
Factory default 0.0s
b1.34 Starting DC braking current
Setting range 0.0 % ~ 150.0 % (Rated frequency converter current)
Minimum unit 0.1 %
Factory default 0.0 %
● [b1.30]=0: Start directly
The frequency converter runs at "Starting frequency" [b1.31], for "Starting frequency
holding time" [b1.32], and accelerates to set frequency with defined acceleration
time. This mode is suitable for circumstances with high static friction torque and low
load inertia.
"Starting frequency holding time" [b1.32] needs to be set as a non-zero
value when the motor needs to be started with certain starting frequency.
● [b1.30]=1: Braking before start
– "Starting DC braking time" [b1.33]≠0s, DC braking is executed before accelerat‐
ing to "Starting frequency" [b1.31].
This mode is suitable for circumstances where the load may encounter forward / re‐
verse rotation when the frequency converter is in stop mode.
● [b1.30]=2: Start with speed capture
The frequency converter firstly identifies the rotation speed and direction of the mo‐
tor and then starts with the current frequency of the motor to realize smooth starting
without shock to the rotating motor. This mode is suitable for restarting after transi‐
ent power fault in the case of a large inertia load.
When the frequency converter is starting and accelerating, if the set fre‐
quency is lower than the "Starting frequency" [b1.31], the frequency con‐
verter firstly starts at the starting frequency and runs for "Starting frequen‐
cy holding time" [b1.32], and then decelerates to the set frequency.
The actual starting DC braking current is calculated as below:
● If the x % of rated frequency converter current is lower than the rated motor current,
then the actual starting DC braking current is x % of rated frequency converter cur‐
rent.
● If the x % of rated frequency converter current is higher than the rated motor current,
then the actual starting DC braking current is x % of rated motor current.
Example: For a frequency converter of 0.75 kW / 200 V, the rated current is 3.9 A, the
motor rated current is 3.45 A, when [b1.34] input is 100%, this parameter will activate
the limitation function as the above described rule.
Bosch Rexroth AG
Parameter Settings
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