9
Circuits for the Mains Connection
9.1
General Information
The controls of mains contactor and DC bus short circuit for supply units and
drive controllers suggested in this documentation describe the functional prin‐
ciples.
The selection of the control and its effects depend on the extent
of the functions and the operating sequence of the installation or
machine. The selection of the control falls to the installation or
machine manufacturer’s responsibility.
9.2
Mains Contactor, Bb Contact
The central components in the circuit for the mains connection are:
●
Mains contactor
●
Bb contact
Mains Contactor
Mains contactors in the power circuit of the mains connection switch the pow‐
er supply. In the case of error, mains contactors interrupt the energy flow
from the supply mains and therewith the power supply of the drive controllers.
When the drive system is supplied via another circuit, e.g. in regenerative
form via permanently driven motor:
●
Integrate this supply in the circuit for the mains connection.
●
Take this into account when selecting the drive controllers and addition‐
al components.
Risk of fire caused by the "sacrificing behav‐
ior" of the ZKS stage!
NOTICE
The "ZKS" input activates the "DC bus short circuit" function, when the 24V
control voltage has not been applied and when there isn't any current flowing
to the input. This condition can occur in the following situations:
●
Failure of 24V control voltage
●
Wire break
●
Activation of serially connected contacts (e.g. axis limit switches)
If the kinetic energy of the mechanical axis system regenerated when braking
is greater than the energy absorption capacity of HLB, the HLB device re‐
mains active when braking via ZKS takes place, until it is thermally destroyed
(sacrificing behavior). Risk of fire! In this case, braking via ZKS may only
come into effect in the case of an emergency (e.g. activation of an axis limit
switch causes the mains supply to be cut off and simultaneously causes the
24V supply of the ZKS input to be interrupted).
Install a 24V UPS, if the "sacrificing behavior" of HLB is relevant to your drive
system in the case of an emergency. This prevents the braking via ZKS
which causes HLB to be destroyed due to the failure of the 24V control volt‐
age. Braking via ZKS then will only take place in cases of emergency.
Switching off the power supply protects the supply units and drive controllers
against permanently present error states and damage being caused by the
persistent effect of these error states.
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG
141/309
Circuits for the Mains Connection
