Spectrum Controls 1734sc-IF4U - Manual (Page 19)

Chapter 2: Installation and Wiring 2-7
User’s Manual Pub. 0300266-01 Rev. A
vertical position.
This releases the locking mechanism.
7.) Lift straight up to remove.
2.4.6 Install a 1734-TOPS Base
1.) Position the base vertically above the installed units, such as an adapter, power
supply, or existing module.
2.) Slide the base down, allowing the interlocking side pieces to engage the adjacent
installed unit.
3.) Press firmly to seat the base on the DIN rail until the base snaps into place.
4.) Verify that the DIN-rail locking screw is in a horizontal, locked position before
inserting an I/O module.
2.4.7 Remove a 1734-TOPS Base
To remove a wiring base from the DIN rail, you must remove the module installed to the
right of the base.
1.) Squeeze the module locking mechanism of the module to the right of the base,
pulling up to remove the module.
2.) Turn the orange locking screw to a vertical position to unlock the base from the
DIN rail.
3.) Slide the base up to release it from its mating units.
Section 2.5
Field Wiring
Connections
Consider the following when wiring your system:
General
 Power and input wiring must be in accordance with Class 1, Division 2 wiring
methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in
accordance with the authority having jurisdiction.
 Use Belden™ 8761, or equivalent, shielded wire.
 To ensure optimum accuracy, limit overall cable impedance by keeping a cable
as short as possible. Locate the module as close to input devices as the
application permits.
 Digital and analog power must be supplied by an Isolated Secondary Limited
Energy Low Voltage source.
Inputs
 The module provides loop power for analog inputs.