2. Installation, Piping, and Wiring
81
TI 11B08A01-01E
NOTE
•
For analog input, use twisted pair cables with a common shield (a twist pitch of 50 mm or
less), to avoid induction noise.
Use twisted pair cables for digital signals as well.
•
Stranded cables are superior to single-conductor cables in the following respects:
• Stranded cables are more flexible and easy to lay in a curved pit or cramped space.
•
Stranded cables provide better contact with crimp-on terminal, with less aging over time.
•
Secure the cables so they do not weight on the terminals.
•
Fasten the terminal screws securely.
n
Signal Cable Termination
CAUTION
•
Use crimp-on terminal with insulated covering.
•
Wire crimp-on terminal with the dedicated tool.
•
The tool must be suitable for the size of wires.
Use crimp-on terminal for all signal cables.
The specifications of the
crimp-on terminal are determined by the nominal cross sectional area of
the power cable.
For the protection system, use MKKDSN series terminals from Phoenix Contact Ltd., and FKC
series terminals from the same company for the contact output line (D) (G), analog input line (E),
contact input line (F), serial communication line (H), analog output line (J), and explosionproof
status line (L) of the electronics section.
For the Ethernet line (L) (M), use twisted pair cables of CAT.5 or CAT.5E or multi-mode optical
fiber of 50/125 μm or 62.5/125 μm.
For these wiring connections, use AI series crimp-on terminal from Phoenix Contact Ltd.
There are four types of crimp-on terminal for respective wire diameters (see Table 2.5).
Peel off the cover of wire by 6 mm for MKKDSN series terminals and 10 mm for FKC series
terminals (maker-recommended values).
CAUTION
•
Parts such as the signal line, relay terminal, relay, and power supply to be connected to the
contact input/output shall comply with IEC 61010 or CSA 61010.
• Connect
wiring after securing protective grounding.
l
External I/O cutoff output (power cutoff signal) (L)
Wiring for the cutoff signal must be performed in case the explosionproof requirements are not
satisfied.
The shield is grounded at the earth bar (see Figure 2.24). Remove the cover on the upper right of
the electronics section and perform wiring.
Sep. 07, 2017-00
