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3.4
Installation Instructions
Ground Connection
Screening
Fan
1070 072 133-102 (99.11) GB
.
Careful observance of the following installation instructions will en
hance the interference immunity / reliability of the system!
To dissipate the interference potential that is active between the PLC and
reference earth, the PLC must be connected to ground via a low-impedance
connection.
Earthing strips provide considerably better HF characteristics qualities than
standard cables and should therefore be preferred.
To protect the PBK from electrostatic discharges, all slots must be filled with
channel modules or dummy covers, with mounting screws tightened se-
curely to the front cover.
Whether or not a fan unit shall be required for the operation of the PBK will
depend on its channel module population. Refer also to Module Description,
MOBY I/F channel module, Order no. 1070 070 139.
For the MOBY I/F channel module, the following applies:
D Provided that the 24 V power supply of the Read/write units is not con-
nected via the 24 V connection at the PBK front panel but externally, a fan
will not be required.
D If the PBK module supplies the 24 V operating power to the Read/write
units, the following currents are permitted:
D with fan: Each MOBY I/F channel module, max. 400 mA
D without fan: Total current of all MOBY I/F channel modules, max.
550 mA
PBK Module Operation
3–9
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