Electrical Connections - ABB VA Master FAM540 Commissioning Instructions

2.2.6

Electrical connections

Potentially explosive atmosphere
FAM540-B/C/D
3
FAM540-E/F
3
Fig. 2: ATEX / IECEx electrical connection
1 NAMUR switching amplifier 2 Safety barrier
3 Potential equalization
Terminal Function
31 / 32 Power supply / current output / HART output
41 / 42 Programmable binary output
Alarm signaling unit (min.)
51 / 52 Alarm signaling unit (max.)
1,8
1,6
1,4
1,2
1
0,8
0,6
0,4
0,2
0
14
20
Ex ia
Ex d, Ex na, Ex td
Fig. 3: Terminals 31 / 32, power supply / load
U Power supply
V
R Maximum permissible load in the power supply (e.g. indicator)
B
The minimum voltage U = 0 V is based on a load of 0 Ω.
V
Change from two to one column
Non-hazardous area
1
+
#
52
#
51
+
#
42
#
41
2
+
#
31
E
32
+
#
42
41 #
28 46
30 40
Signal cable
The Ex calculations are based on temperatures of
80 °C (176 °F) at the cable input. For this reason, cables with
a specification of 80 °C (176 °F) must be used.
For cables limited to 70 °C (158 °F), a maximum ambient
temperature of T
The resulting new maximum measuring medium temperatures
are determined as follows:
— Calculate a new ambient temperature:
T new = T
amb
— Use the calculated ambient temperature T
R
B
determine the new associated permissible measuring
4...20 mA
medium temperatures in the tables.
— Please use the limit value tables with the original ambient
temperature T
class. See chapter „Safety specifications ATEX / IECEx"
G11829
on page 10, Tables 1 through 5.
Example:
— T = 50 °C (122 °F) becomes
amb
T new = 60 °C (140 °F).
amb
— Determine the measuring medium temperature
T = 60 °C (140 °F).
amb
— Determine the temperature class for
T = 50 °C (122 °F).
amb
Earthing
U [V]
50
V
G11830
Fig. 4: Earthing
1 Earthing terminal
2 Potential equalization in accordance with EN 60079-0
The FAM540 housing must be correctly earthed in order to
ensure proper function and safe operation.
Copper wires with a minimum cross-section of 6 mm
(AWG 10) must be used to connect to the potential
equalization.
NOTE
The operator must ensure that when connecting the
protective earth (PE), there are no potential differences
between protective earth (PE) and potential equalization,
even in the event of a fault.
= 60 °C (140 °F) applies.
amb
+ 10 °C (18 °F).
amb
to determine the relevant temperature
amb
VA Master FAM540 | CI/FAM540-EN Rev. B 9
new to
amb
2