Spectrum Controls 1769sc-HART Modules - Manual (Page 27)

Chapter 3: Installation and Wiring
User’s Manual 0300217-03 Rev. A
3-9
Figure 3-5
To remove the terminal block, loosen the upper and lower retaining screws. The terminal
block will back away from the module as you remove the screws. When replacing the
terminal block, torque the retaining screws to 0.46 Nm (4.1 in-lbs).
3.7.4 Wiring the Finger-Safe Terminal Block
When wiring the terminal block, keep the finger-safe cover in place.
1. Loosen the terminal screws to be wired.
2. Route the wire under the terminal pressure plate. You can use the bare wire or a
spade lug. The terminals accept a 6.35 mm (0.25 in.) spade lug.
NOTE: The terminal screws are non-captive. Therefore, it is possible to use a ring lug
[maximum 1/4 inch o.d. with a 0.139 inch minimum i.d. (M3.5)] with the module.
3. Tighten the terminal screw making sure the pressure plate secures the wire.
Recommended torque when tightening terminal screws is 0.68 Nm (6 in-lbs).
NOTE: If you need to remove the finger-safe cover, insert a screwdriver into one of the
square, wiring holes and gently pry the cover off. If you wire the terminal block with
the finger-safe cover removed, you may not be able to put it back on the terminal block
because the wires will be in the way.
Wire Size and Terminal Screw Torque
Each terminal accepts up to two wires with the following restrictions:
Wire Type
Wire Size Terminal Screw
Torque Retaining Screw
Torque
Solid Cu-90°C
(194°F) #14 to #22 AWG
(1.63 to 0.65 mm
2 )
0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)
Stranded Cu-90°C
(194°F) #16 to #22 AWG
(1.63 to 0.65 mm
2 )
0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)
3.7.5 Wiring the Module
Before wiring any module, disconnect power from the system power
supply.
After the module is properly installed, follow the wiring procedure below, using the
proper cable, Belden 8761.
Figure 3-6
!
Attention
Signal Wire
Drain Wire
Signal Wire
Cable
Signal Wire
Foil Shield
Signal Wire
To Analog Output To Module