Wiring Example - Hitachi SJ Series Safety Function Manual

Chapter 6
Chapter 6 Installation
6.1 Contents in this chapter
This chapter describes the items to be taken into
consideration for installation.
6.2 Installation
The product must be installed as following the instructions
provided in the User's Guide of SJ-P1 and this
documentation.
In case of using any optional devices such as a fieldbus
module, please read through the guides of each optional
device before working on the product.
Operation sequence of wiring example
1. When the safety switch is pressed, S14 and S24 become
OFF, the current flowing in ST1 and ST2 terminals are
shut off, STO signals are delivered to SJ-P1 and the STO
function is activated. (The output of the inverter is shut
off).
2. Even after the safety switch has been released, the STO
inputs to ST1/ST2 on SJ-P1 are held by the safety relay.
3. After the operator of the system has confirmed the
safety of human and the system, and then presses the
reset switch, STO inputs to ST1/ST2 on SJ-P1 are released
and the inverter becomes available to restart motor
operation.

6.3 Wiring example

The figure below is a wiring example under the following
conditions.
 Use of an external power supply for STO inputs
 STO input logic："Sink" logic
Note: In case of using the internal power supply or
wiring with source logic, please perform wiring
appropriately as referring to Chapter 4.
 No use of EDM signal output
 Reset/Release of STO input to SJ-P1 is controlled
using the reset function of a safety unit
6-1
Installation
6