2.3 Transmitter wiring
Warning!
• Make electrical connections with the power supply switched off!
• The PE terminal strip must be grounded externally (contact protection)!
• When wiring up probes and sensors in explosion hazardous areas, observe the
instructions on the certificate and other local regulations.
Terminal stripThe terminal strip for cable diameters up to 2.5 mm
2
is located in a separate connection
compartment. Fig. 2.5 shows the wiring diagram for the Prolevel FMC 661 (Terminal 3 is
reserved for the internal protective ground):
• Remove the plastic cover from the front of the connection compartment
• Press out the pre-stamped cable entries as required
bottom: 5 x Pg 16, 4 x Pg 13.5; rear: 4 x Pg 16.
PowerThe power requirements are printed on the nameplate at the right-hand side of the
nameplate, see also Section 1.5, "Technical Data".
• If the specifications on the nameplate do not correspond to those of your
power supply, do not connect up - you may damage the instrument!
• Connect the protective ground to the metallic terminal strip provided at the left
— this ensures safe isolation and contact protection.
• Current output, relay outputs, power connection and sensor input are all
electrically isolated from one another.
Analogue outputs Only one non-floating device can be connected to the current output.
• There is no limit to the number of floating devices, other than that imposed by
considerations of the maximum load of 600 Ω.
RelaysFor the switching capacity of the relays see the technical data in Section 1.5.
• Relays 1a and 1b are normally assigned to channel 1
• Relays 2a and 2b are normally assigned to channel 2.
The assignment can be changed by software, see Section 4.4.
RS-485
[EEx ia] IIC
B DGND A
L+ L-
L1 N
L+
L-
16...60 VDC
85...253 VAC
20...55 VAC
L1
N
PE
0/4...20 mA
Sensor 1
Sensor 2
RxD/TxD-P
RxD/TxD-N
DGND
RS-485
1
23 4 5
81 82
91 92
3111 21
41
1b1a 2a 2b
51
61
3212 22
42
52
62
3313 23
43
53
60
- +
- +
BA142_13
current 1
relays channel 1
relays channel 2
alarm relay
PE terminal strip
ground externally
optional interface
level sensor
limit switch
Commulog VU 260Z
bus switches
Fig. 2.5:
Terminal assignments for
Prolevel FMC 661
Warning!
Prolevel FMC 661 Chapter 2: Installation
Endress+Hauser 15
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