4
4
E L E C T R I C A L I N S TA L L AT I O N
Permanently Connected Equipment:
Disconnecting devices shall be included in the system
installation. The disconnects shall be within close prox-
imity of the equipment, accessible to operators, and
marked appropriately as the disconnect for the associated
circuit. Assure the disconnect ratings are appropriately
sized for the circuit protected (See Specifications).
Circuit Separation:
Two cable entry locations are provided to aid in maintain-
ing separation of “hazardous live” (typically mains volt-
ages such as 115VAC and 230VAC) and limited circuits
(typically control voltages less than 30Vrms or 42.4VDC
such as the data communication signals). However, since
the Wireless Communication Interface's single wiring
compartment can not absolutely protect against physical
contact between multiple circuits, it is required that all
wiring used must have an insulation rating of 300v mini-
mum, and a temperature rating of 176˚F (80˚C) minimum.
Protective Earthing:
Each Wireless Communication Interface is provided with
a "protective conductor terminal" which shall be termi-
nated to the local earth ground potential. This terminal
shall be used to eliminate shock hazard in the unlikely
event of internal insulation breakdown. Select wire size
that can carry in excess of the sum of all circuit's maxi-
mum amperage.
EMI Optimizing:
(See Figure 5)
Ferrite beads are provided for installation in the wiring to
minimize affects of EMI. Wrap the large ferrite bead with
the incoming power wires (including protective earth con-
ductor) two to four full turns through the bead’s core.
Wrap small ferrite bead with incoming data wires (RS-232
or RS-485) two to four full turns through the bead’s core.
Position each bead immediately inside the cable entrance
of the enclosure.
Power Input:
1) 115 or 230VAC Source:
(See Figure 6) Verify the
intended voltage supply is compatible with the voltage
configuration indicated on the electronics and the
external nameplate. Standard mains supply voltage
(115VAC or 230VAC as ordered) can be connected to
the unit's L1 and N terminals.
2) 12VAC Source:
(See Figure 7) A dedicated, isolated
12VAC supply voltage can be connected to the +L and
-L terminals. This feature allows for a more convenient
means to power the unit without the concerns of sup-
plying high voltage. This source could be a wall trans-
former or flange mount transformer, with 12VAC output,
5~10VA rating (reference Stancor #STA-4112A (wall,
plug-in) or Stancor #P-8392 (chassis mount)).
Figure 5
Figure 6
Figure 7
