Ashida ADR241B, Instruction Manual

Page: 41 / 272

ADR241B
Doc ID : ADR241B-DO_IM_01
Ref ID : ADR241B/IM/I&P
Rev No. : 06
Page No. : 41 of 272
2.3.2 Relay Connection and Diagram
Before installation of the relay check the correct working procedure as to ensure safety. The
Terminal exposed during installation may present a hazardous voltage unless the equipment
is electrically isolated. Any disassembly of the equipment may expose parts to hazardous
voltage. Electronic parts may be damaged if suitable electrostatic discharge (ESD)
precautions are not taken. Voltage and current connection should be made using insulated
crimp termination to ensure that terminal block insulation requirements are maintained for
safety. To ensure that wires are correctly terminated the correct crimp terminal and tool for
wire size should be used. The equipment must be connected in accordance with the
appropriate connection diagram.
2.3.3 Before energizing the relay following should be checked
1. Voltage rating and polarity.
2. CT circuit rating and integrity of connection.
3. Protective fuse rating.
4. Integrity of the earthing connection.
5. Current rating of external wiring, applicable as per application.
2.3.4 Relay Operating Condition
The equipment should be operated within the specified electrical and environmental limits.
2.3.5 Current Transformer (CT) Circuit
Do not open the secondary circuit of a live CT as the high voltage produce may be lethal to
personnel and could damage insulation. Generally, for safety, the secondary of the line CT
must be shorted before opening any connection to it.
2.3.6 Insulation and dielectric strength testing
Insulation testing may leave capacitors charged up to a hazardous voltage. At the end of
each part test, the voltage should be gradually reduced to zero, to discharge capacitors, as
this may result in damage.
2.3.7 Cables and Connectors
This section describes the type of wiring and connections that should be used when installing
the device. For pin-out details please refer to the wiring diagrams.
Caution: Before carrying out any work on the equipment, user
should be familiar with the Safety Section and the ratings
on the equipment’s rating label.