D.c. Link Control In The Event Of A Power Failure - Bosch DM**8001 Series Parameter And Commissioning Manual

5.1.17

D.C. link control in the event of a power failure

P47 (A-0-0047)
1070 066 028-101 (01.05) GB
If no line voltage is present, the frequency inverter maintains the d.c. link by
using the kinetic motor energy, thus providing for safe braking up to motor
zero speed. The time required for braking only depends on the external mo-
ment of inertia.
D Power failure, power interruption or EMERGENCY-STOP
The braking operation starts as soon as the voltage drops below the un-
dervoltage limit. If the line power returns during the braking phase, the
inverter accelerates in a controlled restart operation in accordance with
the acceleration ramp setting.
D Braking with setpoint control
The braking operation starts when the d.c. link voltage exceeds 700 V.
Depending on the external moment of inertia, the inverter extends the
braking ramp selected in P12 and maintains the d.c. link voltage at 700 V.
D.C. link control in the event of a power failure
Off
all
DMs, DS
bc0
(0)
factory
setting for ASM
Commissioning
On, On,
power failure setpoint-con-
and EMER- trolled braking
GENCY-STOP
bc1 bc2
(1) (2)
5–25
On,
power failure,
EMERGENCY-
STOP
and braking
bc3
(3)