Connection
10 User’sManual
3.1 Introduction
This chapter deals with the instructions for measuring transducer connection. Both the use and
connection of the device includes handling with dangerous currents and voltages. Only a
qualified person shall therefore perform connection. Iskra MIS does not take any responsibility
regarding the use and connection. If any doubt occurs regarding connection and use in the
system, which device is intended for, please contact a person who is responsible for such
installations.
Before use: Check voltages and phase rotation, supply voltage and nominal frequency.
A circuit breaker with current rating of at least 1A shall be included in close proximity with aux.
supply installation as a means of disconnection. It shall be properly marked.
Warning!
Wrong or incomplete connection of supply, measurement or other
terminals can cause malfunction or damage the device.
Note
After connection, settings have to be performed via communication
(connection mode, current and voltage transformers ratio …).
3.2 Mounting
MT440 measuring transducer is designed for DIN rail mounting. It should be mounted on a
35 mm DIN rail by means of two plastic fasteners. Before installation fasteners should be in
open position (pulled). After device is on place, fasteners are locked (pushed) to close position.
3.3 Electric connection
Voltage inputs of measuring transducer can be connected directly to low-voltage network or via
appropriate voltage measuring transformer to medium or high voltage network.
Current inputs of measuring transducer can be connected directly to low-voltage network or via a
corresponding current transformer.
Choose connection from the following figures and connect corresponding voltages and currents.
Information on electrical characteristics is given in the chapter Inputs on page 35.
Warning!
Before using tool for accessing interior or any other part of the transducer
which in normal use may be hazardous live (aux. supply and measuring
input terminals), transducer MUST BE ISOLATED OR
DISCONNECTED from hazardous live voltage.
Note
For proper connection wire diameters and other wiring requirements see
Chaper 6.4 Connection
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