MTL MTL5000 Series, Инструкция по эксплуатации

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and specifications are IEC61158-2, ISA-S50.02 for 31.25kbit/s
fieldbus systems and FOUNDATION™ Fieldbus 31.25kbit/s Physical
Layer Profile Specification FF816.
Additional information on fieldbus termination can be found in
MTL's
AB001 and AB002 application briefs.
6.37.1 Package details
The FBT1-IS terminator is designed for mounting on 35 x 7.5 mm or 35
x 15 mm DIN rail to EN50022.
6.37.2 Fitting FBT1-IS
Orientate the FBT1-IS as shown in Figure 6.82a and locate it on the
DIN rail. Using the DIN rail edge as the pivot point, press down the
other end until the package clicks into place on the other side of the rail.
6.37.3 Removal
Removal requires a screwdriver or similar flat blade. Locate the
screwdriver into the slot provided in the fixing bracket on the 'device'
side of the spur connector (see Figure 6.86). Carefully lever towards the
spur connector body until the mounting is released from the DIN rail and
lift it off the rail.
6.37.4 Connections
The +, - and cable screen (S) connections are indicated in Figure 6.87.
The terminals will accept cables with a cross sectional area of up to 4
mm2. A straight blade screwdriver with a maximum blade width of 3.5
mm is required to operate the terminals. The recommended tightening
torque is <0.9 Nm.
6.36.1 Wiring connections
See figure 6.83 for wiring connections and refer to MTL's Application
Brief AB001.
Note: To assist the process of terminating cable screens, terminals 7
and 10 are linked internally. Please note however that these terminals
are not earthed.
**Where supply voltage is 20 to 30V dc, ambient temperature limits are
–20°C to 60°C. If supply voltage is 20 to 35V dc, the ambient
temperature limits are –20°C to +55°C.
Table 6.17
**Where supply voltage is 20 to 30V dc, ambient temperature limits are
-20°C to 60°C. If supply voltage is 20 to 35V dc, the ambient
temperature limits are -20°C to +55°C.
6.36.2 Testing
Make the safe-area connections shown in figure 6.84 and, substituting
appropriate resistors for R
test
, carry out the checks shown in table 6.17
6.37 FBTI-IS fieldbus terminator
The FBT1-IS is a DIN rail mounting unit that provides the correct
termination for fieldbus circuits in either safe or hazardous areas.
The unit is certified for use in Zone 0, IIC, T4 locations, and fully
complies with the electrical characteristics requirements of section
22.7.5 of appropriate fieldbus standards. Applicable fieldbus standards
33 INM5000-6 Jul 2010
7
8
9
10
11
12
13
14
PSU
Switch
T
Fieldbus
T
T
–
+
20 to 30V dc
Vs–
Vs+
–
+
FBT1*
Fieldbus
terminator
Fieldbus
device(s)
FBT1*
Fieldbus
terminator
Safe area
Figure 6.83: MTL5995 wiring diagrams and connections
Rtest Current (I1) Voltage across terminals
8 and 9 (V1)
1.8k
Ω
- 18.6V
≤
V
1
≤
19.4V
56
Ω
10W ~ 340mA -
0
Ω
< 500mA -
7
8
9
10
11
12
13
14
PSU
T
–
+
20 to 30V dc**
Vs–
Vs+
–
+
R
test
R
test
I
1
6
5
4
3
2
1
Figure 6.84: Test circuit for MTL5995
S
S
+
–
+
–
F E
G H
D C
A B
63 mm
18 mm
64 mm
Figure 6.81: Terminator/Spur connector package
a) b )
Figure 6.86: a) fitting and b) removal
FBT1-IS
S
S
+ –
+ –
T
C
A
D
H
F E
Figure 6.87: Terminal assignments
Terminal Function
7 Internally linked to 10
8 & 11 Safe-area fieldbus device(s) connection –ve
9 & 12 Safe-area fieldbus device(s) connve
10 Internally linked to 7
13 Supply –ve
14 ve
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