Grounding The Housing; Power Supply/Sequencer Module (Pssm); General Information About The Pssm - Emerson ControlWave Instruction Manual

2.2.4 Grounding the Housing

Caution

2.3 Power Supply/Sequencer Module (PSSM)

2.3.1 General Information about the PSSM

Revised Aug-2015
ControlWave I/O Expansion Rack Instruction Manual
Do not install any modules in the housing until you mount and ground
the housing at the designated installation site.
Housings have a ground lug that accommodates up to a #4 AWG wire
size. Once you install the housing, you must run a ground wire between
the housing ground lug and a known good earth ground.
When you install the various ControlWave modules into the housing
and secure them using the captured panel fasteners, this automatically
connects them to chassis ground.
: After you install the PSSM in the housing, as an added
Note
precaution we recommend that you run a #14 AWG wire from
the TB2-3 power connection (chassis ground) to the same known
good earth ground.
Additional grounding guidelines include:
Use stranded copper wire (#4 AWG) for the housing to earth

ground, and keep the length as short as possible.
Clamp or braze the ground wire to the ground bed conductor

(typically a stranded copper AWG 0000 cable installed vertically or
horizontally).
Tin the wire ends with solder (using a high-wattage soldering iron)

prior to inserting the wire into the housing ground lug.
Run the ground wire so that any routing bend in the cable has a

minimum radius of 12-inches below ground and 8-inches above
ground.
Before we actually install the PSSM it in the housing, we're going to
discuss some general information about how it works.
The Power Supply/Sequencer module (PSSM) takes power from an
external bulk DC power supply and then provides power through the
ControlWave housing/backplane to all installed modules.
The PSSM is used in the following ControlWave models:

ControlWave Process Automation Controller

ControlWave I/O Expansion Rack
 ControlWave Redundant Controller
The PSSM plugs into slot #1 (first slot from the left) on the
ControlWave's backplane using connector J1.
Installation 2-11