7.3.3
IT Mains Type
I
Isolation of all active parts from ground or connection of one point to
ground via an impedance R
E
T
Exposed conductive parts directly grounded, independent of ground‐
ing of current source (station ground)
Fig.7-4:
IT Mains Type
Notes on Project Planning
Damage to the devices by voltage arcing!
NOTICE
For applications with static charging (e.g. printing, packaging) and operation
at IT mains type, use an isolating transformer with U
K
≤ 2.5%.
Voltage increase in the case of ground fault!
In case of the error "ground fault" in the IT mains type, higher vol‐
tages against ground (device housing) than in error-free operation
affect the device.
For operation at the IT mains type, the drive system including
mains filter and mains choke should be galvanically decoupled
from the mains via an isolating transformer.
In this way, the ground fault detection or monitoring can remain
effective in the installation.
HCS03 drive controllers must not be operated at IT mains types.
When operating IndraDrive C (HCS02) drive systems in other applications
without isolating transformer at the IT mains type:
●
Observe the allowed mains voltage U
LN
at the IT mains type of the cor‐
responding devices
●
Observe the allowed switching frequency f
s
; see note below
●
Check whether the ground fault detection of the mains does not trigger
accidentally
DOK-INDRV*-SYSTEM*****-PR06-EN-P
Rexroth IndraDrive Drive Systems with HMV01/02 HMS01/02, HMD01, HCS02/03
Bosch Rexroth AG
77/309
Project Planning of Mains Connection
