Spectrum Controls 140 MPM 204 00sc - Manual (Page 16)

Quantum Series 140 MPM 204 00sc
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Routing field wiring in a grounded conduit can reduce electrical noise.
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If field wiring must cross AC or power cables, ensure that they cross at right angles.
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If multiple power supplies are used with analog inputs, the power supply commons must be connected.
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To ensure optimal 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.
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Tighten terminal screws with care. Excessive tightening can strip a screw.
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The module is generally mounted to a well grounded mounting surface, such as a metal panel.
Additional grounding connections from the module’s mounting tabs or DIN rail (if used) are not
required unless the mounting surface cannot be grounded. Keep shield connection to ground as short as
possible.
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Under normal conditions, the drain wire and shield junction should be connected to earth ground, via a
panel or mounting screw at the module end. Refer to IEEE Std. 518, Section 6.4.2.7 or contact the
sensor manufacturer for additional details.
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For field wiring, use shielded, twisted-pair cable, and ground each cable’s shield wire at one end only.
At the opposite end of each cable, tape the exposed shield wire to insulate it from electrical contact. A
good shield wire ground is a rack assembly mounting bolt or stud.
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In the process of wiring the modules, route all signal wires as far as possible from potential sources of
electrical noise, such as motors, transformers, etc. (especially AC devices).
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If noise persists for a device, try grounding the opposite end of the cable. (You can only ground one
end at a time.)
Module Installation Module Installation Module Installation Module Installation Module Installation
This section tells how to insert the module in the PLC rack and remove it as needed. The Quantum counter
module is suitable for use in an industrial environment when installed in accordance with these instructions.
Specifically, this equipment is intended for use in clean, dry environments (Pollution Degree 2) and for circuits
not exceeding Over Voltage Category II (IEC 60664-1).
Installing the T Installing the T Installing the T Installing the T Installing the Terminal Block erminal Block erminal Block erminal Block erminal Block
To install the terminal block:
1. 1. 1. 1. 1. Gently insert the terminal block into the module housing.
2. 2. 2. 2. 2. Install the upper and lower retaining screws, using 0.46 Nm (4.1 in-lb) torque.
3. 3. 3. 3. 3. Use the write-on label located on the door of the module to identify the module location and type.