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BCs160VA
Nov. 15, 1997
SMART-PULP
Smart Consistency Transmitter
1.2 ELECTRICAL CONNECTIONS
1.2.1 Power supply and wiring
SMART-PULP’s wiring connections are shown in
Figures 1.2.1a and b.
Figure 1.2.1e shows the test meter connection and
the possible connections of 275 HART® user
interface.
With the standard display unit the current loop and
optional binary input connections must be done
under the display.
When using the remote display the connections
must be done in the remote operator terminal. The
fixed connection cable must be connected to the
terminals of the transmitter.
The transmitter’s minimum supply voltage is
determined by the load resistance. Figure 1.2.1d
shows the load resistance as a function of supply
voltage. Load resistance refers to the sum of the
resistances of the current loop’s test resistors, cable
resistance, and power supply resistance. The
following additional requirements are applied to the
power supply if HART® communications are in use:
• Minimum load resistance: 250
Ω
• Ripple: 47 to 125 Hz 0.2 Vpp max.
• Noise: 500 to 10,000 Hz 2.2 mV RMS max.
• Impedance: 500 to 10,000 Hz 10
Ω
max.
Making the connections:
• Open the display cover by turning it
counterclockwise.
• Turn the display unit slightly counterclockwise, then
pull it out carefully.
• Insert the cable through the inlet. Use the inlet that
points to the side or downwards. Leave an extra loop
of cable outside the transmitter as reserve and to
conduct drain water out. Tighten the inlet nut and
ensure that the inlet is properly sealed.
• Make the connections as shown in Figures 1.2.1a
and b. Connect the groundings in accordance with
the control system’s instructions. The remote
operator terminal cable shield must be grounded
inside the inlet gland of the transmitter.
• Replace the display unit and make sure that the
flat cable folds properly under the unit. (Push home
at 45
O
angle, then turn 45
O
clockwise.)
• Check the O-ring on the display cover. Then close
the cover tightly.
• Cut the DCS cable shield at the transmitter/remote
operator terminal end, and insulate inside the metal
inlet.
Figure 1.2.1a SMART-PULP’s wiring connections
(2-W). The connections are the same when
remote operator terminal is in use.
Figure 1.2.1b SMART-PULP end of the connection
cable wiring for remote operator terminal.
9
24 V
+
Digital inputs *)
LOAD
4-20 mA
7 6 5 4 3
1 2
-
4
3
2
1
3
2
1
4
0
0
0
1
0
0
1
2
0
1
0
3
0
1
1
4
1
0
0
5
1
0
1
6
1
1
0
7
1
1
1
8 = Recipe
0 = Sampling on
1 = Sampling off
*) 0V = 0 and 24V = 1
+
The signal wires are numbered and the cable shield
grounding wire end must be between the two metal
washers in contact with transmitter body.
Tighten the gland nut properly for good locking and
to keep moisture out from the terminal box.
Washer 1
Washer 2
Shield grounding wire
Gland
Terminal
strips
Cable
Signal Wires
1
2
5
6
7
8
4