Appendix; Switching Supply Units On And Off; Switching On - Bosch Rexroth IndraDrive ML Series Project Planning Manual

DOK-INDRV*-HXX05******-PR02-EN-P
Rexroth IndraDrive ML Drive Systems with HMU05
11

Appendix

11.1

Switching supply units on and off

11.1.1

Switching on

NOTICE
With 3 or more supply units at common mains power supply:
Switch on supply units one after the other with a time interval of at least 0.5
seconds so that the inrush currents are not added.
In the switch-on sequence of the supply unit, the supplying mains is loaded
with the current I
L_trans_max_on
process, voltage overshoot can occur at the mains components connected in
the incoming circuit (e.g. mains filters) due to inductances connected in the
incoming circuit, e.g. the leakage inductance of the mains transformer.
t1 Time depends on whether the supply unit is connected to a
control unit via the communication, and on how fast this control
unit is booting up.
t2 Time can be set by the user. Take the time into account which
is required for run-up of all devices connected to IndraBus.
This time depends on the control unit or the machine.
t3 Switch-on pulse
t4 HNA charges the DC bus and switches the m
t5 Time depends on DC bus capacitance (internal, external) and
mains voltage Mains contactor is switched on by HNA.
t6 Time for internal test routines
t7 Time depends on the supply unit and the connected DC bus
capacitances. Supply unit goes to "LB" (ready for power output)
status
Fig. 11-1: Signal sequences when switching on with digital inputs/outputs
Bosch Rexroth AG
Risk of damage to the supply units when they
are switched on simultaneously!
for the purpose of analysis. During the unloading
369/407
Appendix