Installation Environment; Electrical Installation - Hitachi SJ Series Safety Function Manual

Chapter 5
Chapter 5 Planning installation
5.1 Contents in this chapter
This chapter describes the items which must be taken into
consideration for planning installation SJ-P1.
5.2 Requirement for designer and
installer (installation supervisor)
Designers and installers (installation supervisor) who
design and install safety-related system must have been
trained to have the specialist knowledge of the essential
principles for designing and installing safety-related
systems.
Designers and those who maintenance safety-related
system must have been trained to understand the cause
and consequences of the common cause failure (CCF)

5.3 Installation environment

The product must be installed in a place where
environmental condition such as temperature, humidity,
corrosive gas, dust, vibration, is within the specification of
the product without external environmental controls.
Please refer to the User's Guide of SJ-P1 for the
requirements and specification for installation as well as
the environmental specification provided in chapter 11 in
this documentation.
The SJ-P1 must be installed in an enclosure (cabinet) having
a protection rating of IP54 or higher for protection against
conductive dust and contamination.

5.4 Electrical installation

5.4.1
General Requirement
Please follow the instruction provided in the User's Guide
of SJ-P1 for electrical installation. If there is any conflict or
different description in the User's Guide of SJ-P1 and this
documentation, the description in this documentation
shall be considered to have priority.
All of the cables and signal lines must be protected, routed
and fixed appropriately.
5.4.2
STO input
The two STO inputs (ST1 and ST2) must be appropriately
separated and protected from each other to avoid mutual
interference. (E.g. separated cables, protection, double-
shield cable)
The length of the cablings connected to STO terminals (ST1,
ST2, P24S, CMS and STC) must be twenty (20) meters or
shorter.
Please refer to the wiring examples in Chapter 4 for wirings
on STO terminals.
At least one of the measures 1 to 3 below must be adapted
to STO input wirings for the protection against grounding
fault:
1. Grounding STO signal power line (STC)
 In case of use of the internal power supply
Ground STC terminal
 In case of use of an external power supply
Use a power supply (PELV) which is grounded on STC
terminal side.
5-1
Planning Installation
5