When electrical equipment is in operation dangerous voltage will be present in certain parts of the
equipment. Failure to observe warning notices, incorrect use or improper use may endanger personnel
and equipment and cause personal injury or physical damage.
Before working in the terminal strip area, the P634 must be isolated. Where stranded conductors are
used, insulated crimped wire end ferrules must be employed.
The signals MAIN: Blocked/faulty and SFMON: Warning (LED) (permanently assigned to the
LEDs labeled OUT OF SERVICE and ALARM) can be assigned to output relays to indicate the health of
the P634. Schneider Electric strongly recommends that these output relays are hardwired into the
substation's automation system, for alarm purposes.
Any modifications to this P634 must be in accordance with the manual. If any other modification is
made without the express permission of Schneider Electric, it will invalidate the warranty, and may
render the product unsafe.
Proper and safe operation of this P634 depends on appropriate shipping and handling, proper storage,
installation and commissioning, and on careful operation, maintenance and servicing.
For this reason only qualified personnel may work on or operate this P634.
The User should be familiar with the warnings in the Safety Guide (SFTY/4LM/J11 or later version), with
the warnings in Chapter 5, (p. 5-1), Chapter 10, (p. 10-1), Chapter 11, (p. 11-1) and
Chapter 12, (p. 12-1) and with the content of Chapter 14, (p. 14-1), before working on the
equipment. If the warnings are disregarded, it will invalidate the warranty, and may render the
product unsafe.
Installation of the DHMI:
A protective conductor (ground/earth) of at least 1.5 mm² (US: AWG14 or thicker) must be connected
to the DHMI protective conductor terminal to link the DHMI and the main relay case; these must be
located within the same substation.
To avoid the risk of electric shock the DHMI communication cable must not be in contact with
hazardous live parts.
The DHMI communication cable must not be routed or placed alongside high-voltage cables or
connections. Currents can be induced in the cable which may result in electromagnetic interference.
PLEASE NOTE:
Electrical equipment should be installed, operated, serviced, and maintained only by qualified
personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of the
use of this material. A qualified person is one who has skills and knowledge related to the construction
and operation of electrical equipment and the installation, and has received safety training to
recognize and avoid the hazards involved.
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