Design, Assembly and Service Manual
Page 17 of 44
Induction flow meter FMG600 series
6.2. Electric connections of induction flow meter
The terminals for connecting cables can be accessed upon removal of a cover at the rear part of the box
housing the electronic unit. The cover is held by six socket-head bolts. A schematic diagram of the
connections is shown on the rear side of the cover. Note: USB is for factory calibration only.
Examples of labels showing power supply (line voltage or 24VDC source) and meter signal interconnection
6.2.1. Connection to power source
Terminal 24V 115V 230V/AC/50 ÷ 60 Hz
Terminal 24V/DC
PE
PE grounding conductor
PE
PE grounding conductor
N
N neutral conductor
M
M middle conductor
U
L phase conductor
C
L+ +24 V
To connect the power source, use a standard cable of three conductors of square section, not exceeding
3 x AWG 16 (1,5 mm
2
). For ambient temperatures over 122 ºF (50 ºC), use a cable with rated operating
temperature of at least 194 ºF (90 ºC). Only cables with outer diameters from 0.16" to 0.31“(4 to 8 mm) can
be used with grommet. Using of other diameters of cables cause breaking of protection IP67.
The earthing conductor shall be longer than the phase and neutral conductors. This is a safety requirement
as in the case of loosening the cable clamping in the gland, the earthing conductor shall be the last to be
disconnected from the terminal.
The power supply line shall be protected by an overcurrent circuit breaker. A seal should be applied on the
breaker to prevent unauthorised handling. The electronic unit has no independent power switch.. The
recommended rating of the overcurrent circuit breaker is 4 to 6 A.
