
IM-P505-02-US
Issue 1
32
UTM20 Series Ultrasonic Transit-time Flowmeters
8.9 Mains Power
IMPORTANT:
The measuring device does not have an internal circuit breaker. For compliance with
IEC 61010-1, a switch in close proximity to the transmitter is required so that the power supply line
can be easily disconnected from the mains.
The transmitter may be operated from 90 to 250V AC, 47 to 63 Hz, 24VA maximum power source.
Note:
Mains AC-powered transmitters are protected with 1A, 250V AC, 5×20 mm, slow-blow, field-
replaceable fuse.
WARNING
To prevent shorting out the mains AC power, you must replace the terminal block cover on the
AC module after wiring the power.
Remove the terminal block covers before wiring and replace them after wiring:
1.
Grasp the sides of the cover and gently pull it up.
2.
Insert wires into the slots on the cover and screw them down to secure.
3.
Align the cover in its original orientation over the terminal block and push down to connect.
Fig. 34 AC/DC power connections
External 85 to 264V
85 . . . 264V AC
Return
(Main power wiring must be
of material VW-1 or better.)
(Acceptable wire sizes:
18 to 12 AWG)
TB400
Switch
or
Circuit
Breaker
Chassis Ground
Red
Black
Green
Factory
Wired
Protective
Ground
Connect protective earth conductor to terminal 3.
AC-DC Power Module
(24 Va max.)
24V DC
0V DC
AC-L
AC-N
TB100
1
2
3