MTR-3 Installation Instructions
DEIF A/S Page 8 of 51
Universal auxiliary supply
Auxiliary supply is connected by two screw-in connectors. For safety purposes, it is important that
all wires are firmly fastened. Auxiliary supply is wide range (24V DC-300V DC; 40V AC-276V AC).
Voltage inputs
Each voltage input is connected to a measuring circuit through an input resistor chain (3.3 MΩ
per phase). Maximum value of input voltage is 600 V
L-N
(1000 V
L-L
).
Current inputs
Each current input is connected to a measuring circuit through a current transformer (0.01 Ω per
phase). Maximum allowed thermal value of input current is 15 A (cont.).
Purpose and use of measuring transducer
The instrument is used for monitoring and measuring electric quantities of three-phase electrical
power distribution system. The meter is provided with 32 programme-adjustable alarms and
communication. With the RS485 and USB communication, the transducer can be configured and
by RS485 also measurements can be read. The transducer also functions as an energy counter
(up to four energy counters).
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