5
INM9491 Rev 3
Finishing
Wire up individual power supplies in accordance with wiring schedules. Daisy-chain power supply
connections between individual power plugs or use the power bus (see section 4.1).
Segregate hazardous- and safe-area wiring into separate trunking or looms wherever possible to avoid
errors and maintain a tidy installation.
3.2.3 Ambient temperature considerations
Ambient temperature limits for unenclosed power supplies are from 0°C to +70°C with units close-
packed.
3.3 Power bus - Installation and use
A PB-8T power bus kit enables power supply terminals (13 and 14) of up to 8 installed 9491-PS power
supplies to be linked to a standard 24V power supply. The bus consists of a chain of power plugs and
different lengths are available to suit various numbers of modules as follows.
3.3.1 Check to make sure the bus length is correct for the number of modules involved.
3.3.2 If the number of modules is less than the maximum number the chain will support, cut off
the surplus power plugs at the tail end of the chain - leaving sufficient cable to attach
further power plugs if it becomes necessary later.
3.3.3 Insert power plugs into the power terminals on the safe- area side of each module in
sequence.
3.3.4 Connect the power supply source to the tail end of the chain (using the insulation
displacement connectors [Scotchloks] provided if required).
Notes:
1. To avoid excessive voltage drop or over-current, DO NOT connect power buses in series.
2. Surplus sections can be used (and, if required) connected together provided the cut ends are safely
terminated and/or connected together. Use single ferrules with a crimp tool or insulation displacement
connectors (Scotchloks). Suitable ferrules and connectors are provided with the kits.
– +
Optional insulation
displacement
connectors
x2
Figure 3.3
Power bus
wiring, joining
and terminating
To Next Page
Loading...
