Periodical Check; Precautions - Hitachi WJ200-001S Instruction Manual

Wj200 series single/three-phase inputs 200v/400v class

Hide thumbs Also See for WJ200-001S:

Table of Contents

Periodical check

Since the drive stops even one of the GS1 or GS2 is interrupted, it is to be reconfirmed

that there is not faiure in the path of GS1 and GS2 periodically. Period of this

maintenance is once per year, and the method to make sure GS1 and GS2 in

combination with EDM signal is as described below.

1. To assure, that the Safe Disable function appropriately fulfills the safety

requirements of the application, a throughout risk assessment for the whole safety

system has to be carried out.

2. If EDM signal is not utilized in the system as a reconfirmation of redundancy

between GS1 and GS2, PL of drive is downgraded to PL=c.

3. The Safe Disable function does not cut the power supply to the drive and does not

provide electrical isolation. Before any installation or maintenance work is done,

the drives power supply must be switched off.

4. The wiring distance for the Safe Disable inputs should be shorter than 30 m.

5. The time from opening the Safe Disable input until the drive output is switched off

is less than 10 ms.

6. When two or more inverters are connected to common GS1 and GS2 wiring, please

be sure to put the diode as instructed in page 4-14, otherwise the drive may start to

work even in the safety mode.

not conducted

not conducted

not conducted