Phoenix Controls PCM Series - Wiring and Cable Recommendations; Wiring Best Practices

6 PROGRAMMABLE CONTROL MODULE: LONMARK MKT-0244 MPC-1673 ©2009 Phoenix Controls. Specifications subject to change without notice. Rev. 11/11
Figure 4. Relay Kit Dimensions
Figure 5. Relay Kit Connections
WIRING
All wiring connections are via terminal blocks on the base plate that accommodate wire sizes from 22 to 12 AWG (0.14 to 2.5 mm).
Multiple conductors may be placed under one terminal, providing the cumulative diameter does not exceed 0.1" (2.5 mm).
See Figure 6 for terminal location and typical connections.
Phoenix Controls
Wiring Recommen-
dations
• All circuits must
conform to the
requirements of an
NEC Class 2 (dry)
circuit.
• Use multiple
transformers instead of larger transformers when more than 100 VA is required.
• Each pressurization zone should have either a dedicated single-phase primary circuit, or a
secondary circuit disconnect
• Use cable sizes recommended by Phoenix Controls (see Table 1).
• Use stranded wire for ease of installation.
• Follow good wiring practices:
• Locate cables away from sources of electrical interference (EMI/RFI).
• Do not run signal or communication cable in the same conduit or wire way as power
cables.
• If signal cable must cross power cables place these at a 90-degree angle.
• Shield or drain wires, if required, should be wrapped with insulating tape to prevent contact with exposed conductors or
contacts.
2.42 in.
(61.5 mm)
3.0 in.
(77 mm)
.625 in.
(15.8 mm)
A1
A2
COIL 14
12
11
NO
COM
NC
Power:
Minimum cable section 18 AWG
Inputs:
Minimum cable section 20 AWG (twisted pair)
Digital outputs:
Minimum cable section 18 AWG
Analog outputs:
Minimum cable section 20 AWG (twisted pair)
Maximum wire gauge is 12 AWG (2.5 mm)
Table 1: Recommended Cable Specifications
Fuse
24 Vac/Vdc
COM
To other
equipment
AC
Transformer
24 Vac
Power Connection and Fuse