Module Bus/Cables; Cable Types For Data Lines; Cable Types For The Power Supply Of Bus Modules; Module-Bus - Honeywell ACS-8 Installation Instructions Manual

Installation Instructions / ACS-8
6.2 ACS-8 module bus/cables

6.2.1 Cable types for data lines

Type
J-Y(St)Y
Cat-5e (or better)
6.2.2

Cable types for the power supply of bus modules

- J-Y(St)Y
Note:
- NYM 5 x 1.5mm²
6.2.3 ACS-8 module bus

6.2.3.1 Power supply

There are two possible connection versions:
1. Central power supply of the ACS-8 (in the bus line or a separate line).
- All modules have their voltage supplied by the ACS-8.
- No potential separation is required.
- The maximum distance depends on the voltage drop in the cable.
2. Decentralized power supply by one or more external power supply units distributed throughout the
system.
- All modules connected to an RS 485 module bus must have potential isolators fitted.

6.2.3.2 Power supply of the modules via the bus line

The calculations of the line cross-sections for +12V DC and 0V must take the current requirements of the
connected modules into consideration. In addition, any occasional "switching current" (e.g. relay) must also
be considered.
Even in case of emergency power operation, the operating voltage must not fall below 10V DC. This means
that where the battery voltage is 10.5V DC, only a 0.5V voltage drop can be permitted.
For devices with a power supply of 12V, (without emergency power supply) a voltage drop of 2V can be
permitted.
Length
up to 40m
Up to 1200m
i 0.6mm, i 0.8mm, depending on the calculation (see appendix/Planning
examples)
The required number of wires must not be greater than the terminal diameter.
When using a single J-Y(St)Y cable to carry both the power supply of the
bus modules and the data signals, the cable length is limited to 40m since
this is the data line limit (see 6.2.1 J-Y(St)Y as data line). This must be the
case even if a longer distance was calculated for the power supply.
(See appendix/Planning examples)
Comments
This cable is available with diameters of 0.6mm
and 0.8mm and various numbers of cores.
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