WaterMaster
Electromagnetic flowmeter
4 Electrical Installation
26
IM/WM–EN Rev. M
4.7 Power Supply Connections
4.7.1 AC Power Supply
Warning.
Electrical installation and earthing (grounding) must be in accordance with relevant national and
local standards.
Power must be connected via a suitable isolator and fused in accordance with relevant standards.
When changing fuses F1 or F2, isolate the power supply and wait 20 s before opening the
enclosure.
Replace fuses with the correct part, see Fig 4.18 (AC power) and 4.19, page 27 (DC power).
Fig. 4.18 AC Power Supply Connections
N/L2
L/L1
L/L1 N/L2 PE
Transmitter Label
External Earth Screw
AC power via a
suitable isolator
and fuse
*AC Fuse F1 250 mA Type T
(see table below for suppliers)
>4 mm
2
(<10 AWG) Copper Wire
Power Supply Indicator LED
**Can be used as a
Protective Earth (PE)
if required by
national standards
Brown
Blue
Green / Yellow
Internal Earth
Screws**
*Fuse Supplier
Fuse Part Number
ABB B20411
Bussmann BK/ETF
250
mA
Wickmann 19372
K250mA
