Micromod MOD: 30ML Installation - Manual (Page 39)

MOD 30ML Multiloop Controller
POWER, GROUNDING, AND BUILT-IN I/O CONNECTIONS
3
POWER, GROUNDING, AND BUILT-IN I/O CONNECTIONS
3.1 GENERAL
Read this section thoroughly before making any connections. Installation personnel should
be qualified technicians. Observe all electrical code requirements and safety standards
applicable to these wiring procedures.
Specific instructions and connection diagrams for the various built-in inputs and outputs are
provided in Sections 3.3 through 3.6. A listing of the applicable electrical specifications is
included in each section.
3.2 CONNECTION GUIDELINES
The wiring connections described in this section are made with the controller installed in its
operating location and with the power off. All connection terminals are on the back of the
instrument housing. See Figure 3-1a for Model C and Figure 3-1b for Models A & B. On
Models A & B the terminals are located under a cover. Figure 3-1b shows the cover removed.
! CAUTION For Models A and B, do not connect any wires to terminals 23, 24,
48, and 49. Connections to these terminals can cause an
instrument malfunction. This does not apply to Model C.
The recommended procedure for making power, grounding, and built-in I/O connections is as
follows:
1. Make a copy of the wiring planning sheet, Appendix A, and list each wire connection. It
is recommended that the planning sheet be used to plan and document all wiring
connections: power, grounding, built-in I/O, modular I/O, and communications.
Connection instructions for modular I/O and communications are provided in Sections 4
and 5.
2. The power wire size must be from 14 AWG (1.6 mm) to 18 AWG (1.0 mm) with a 600V,
-20°C +105°C UL, CSA approved rating.
3. The signal wire size can be as small as 22 AWG (0.65 mm). All analog input wiring must
be shielded twisted pairs. Shields must be connected to a good noise free ground (the
chassis ground terminal at the upper right hand corner of the housing is recommended).
See Section 3.4.4 for more information.
4. Route signal wiring less than 30 V rms, 42.4 V peak or 60 V dc from top left. Route signal
wiring greater than 30 V rms, 42.4 V peak or 60 V dc from bottom right. Distribute to
appropriate terminals.
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