Dwyer MTL5045 User Manual
Page 6
2
INM5000-6 Jul 2010
3.1.1 Mounting isolators on DIN rail
Clip isolators onto type T35 DIN rail as shown in figure 3.2, with the
blue signal plugs facing towards the hazardous-area wiring.To remove
an isolator from the rail, insert a screwdriver blade into the clip as shown
and lever the clip gently outwards; pivot the isolator off the rail. Allow a
maximum mounting pitch of 16.2mm for each unit.
3.1.2
Wiring up isolators
Each unit is supplied with the appropriate number and type of safe- and
hazardous-area connectors (see figure 3.3), as dicatated by the
terminals used and the type of power supply. Loop-powered devices do
not require power connectors. Depending on the installation, it may be
easier to wire up isolators with power and signal plugs either in place
or removed. Either way, allow sufficient free cable to permit plugs to be
removed easily for future maintenance and/or replacement purposes.
See section 6 for individual unit wiring instructions.
Note: Units for use with 31.25kbit/s fieldbuses may require additional
terminators to be fitted. See section 6.33 for details of MTL's FBT1
fieldbus terminator.
Signal and power conductors
Removable signal and power plugs are fitted with screw clamp
terminals. Note that the conductors should be between 14 and 24 AWG
(1.6 and 0.5mm dia) in size. Signal plugs, located on top of the
modules, are mechanically keyed to fit in only one position. They are
coloured grey, for safe-area connections, and blue, for hazardous-area
connections.
For externally powered units, a power plug slots into the socket at
terminals 13 and 14 on the safe-area side of each module. The socket
is coloured blue if the unit is dc powered. Power plugs are coloured
grey, for plugging into the blue sockets of dc powered units.
Making connections
a)
Trim back the insulation of conductors by 12mm.
b)
Check the terminal assignments shown in section 6 or on the
side label of the unit.
c)
Insert conductors according to the terminal assignments and
tighten screws.
If the wires are to be fitted with crimp ferrules, the following is a list of
those recommended with required trim lengths for each:
*2- to 3-week lead time
† These ferrules have 18mm length metal tubes which should be cut to
12mm after crimping
Note: Smaller section wire than that stated can often be successfully
used if the crimping is good.
Crimp tool: Phoenix Contact Crimpfox UD6 part number 1204436
Finishing
Wire up individual isolators in accordance with wiring schedules. Daisy-
chain power supply connections between individual power plugs or use
the power bus (see section 4.1).
Segregate hazardous- and safe-area wiring into separate trunking or
looms wherever possible to avoid errors and maintain a tidy installation.
Use an MTL5099 dummy isolator to provide termination and earthing
for unused cores from the hazardous area.
Hazardous-area
connections
Non-hazardous
(safe) area
connections
Power
connectors
104
115
110
16
16.2 pitch
Plug
Entry
Wire
Metal tube Trim
Recommended ferrules
type
size
length
length
(mm2) (mm)
(mm)
Signal
Twin
2x1.5
12
14
Cembre PKET 1512
Signal
Single 0.75
12
14
Weidmuller 902591
Signal
Single
1.0
12
14
Cembre PKC112
Signal
Single
1.0
12
14
Phoenix Contact AI 1-12 RD
(3200674)*
Signal
Single
1.5
12
14
Cembre PKE1518†
Signal
Single
2.5
12
14
Cembre PKE2518†
Power
Twin
2x0.75
10
12
Cembre PKET7510
Power
Twin
2x0.75
10
12
AMP (non-preferred) 966144-5
Power
Twin
2x1.0
10
12
Phoenix Contact AI-TWIN 2X 1-10 RD
Power
Single 0.75
10
12
AMP 966067-0
Power
Single
1.0
10
12
Phoenix Contact AI 1-10 RD
Figure 3.1: Dimensions of MTL5000 Series isolators
Figure 3.2: DIN rail – mounting and removing isolators
12mm
14mm
Power Plugs
Grey: dc supplies (PWR5000)
Signal Plugs
Grey: safe-area side
Blue: hazardous-area side
Figure 3.3: Removable power and signal plugs
Consult table below for
additional details.