
Robway Safety Systems
Page 33 of 72
The RS-485 signals are electrically isolated from the power and care must be take to ensure
that no short circuit is introduced between them, otherwise the unit's transient protection will
be compromised.
Transient protection has been included on all inputs. All internal power rails are current
limited and short circuit protected using re-settable fuses. These fuses will reset only when the
fault has been corrected and the power to the unit has been removed for at least 30 seconds
before re-application. There are no operator adjustments or settings on this board.
For complete wiring details refer to the installation drawings.
6.8.1.1
Specifications
Input supply:
10V - 40V dc @ 8W (max)
Input
fuse:
5A
slow
blow
User
output:
Switched
V+
when PSU is running (5A max)
Internal outputs:
5V @ 500mA (max)
12V
@
500mA
(max)
12V
(2)
@
500mA
(max)
All
supplies
operate
with
1mV
p-p
ripple.
6.8.1.2
Transient protection
Common mode to chassis
:
> 7kV on RS-485 signal, power input and outputs.
Differential (line-to-line):
> 7kV on RS-485 signal lines
> 2kV on power input and outputs.
File : 1550-Telescopic-HRT.DOC
Issue Date: - 01/08/05
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