CHAPTER 2: INSTALLATIONS 01 SEPTEMBER 1998 PAGE 14
HE500OCS050/051 User Manual
2.3
Placing the OCS into Service
Although the Operator Control Stations have been designed for use in industrial environments, the
installation of the unit has an impact on its immunity to noise. A number of considerations must be made
when placing the OCS into service to ensure years of reliable operation. A listing of some of the
considerations follows:
a.
Secure Physical Mounting
The OCS should be securely mounted, isolated from severe vibration.
b.
Ground the OCS Chassis
The OCS chassis needs to be connected to a good earth ground. Make the connection to one of the four
mounting studs on the unit. The studs provide a direct connection to the OCS chassis to which all OCS
printed circuit board earth ground connections are made. With the OCS chassis grounded, electrical
noise can generally be shunted effectively to earth ground.
c.
Install the OCS Rear Cover
The steel rear cover provides important protection against RF (radio frequency) interference.
d.
Use a Properly Constructed Communications Cable
Great care should be made in the construction of the communications cable connecting the OCS to the
target device.
e.
Ground the Communications Cable Shield
Ensure the proper grounding of the communications cable shield. Without proper shield grounding, the
shield typically acts like an antenna and increases the amount of noise induced upon the cable.
f.
Route Communications Cable Properly
Make sure that the communications cable is routed away from high voltage wiring. Communications
cable need to be routed in conduit or a wire-way containing only communications or low energy signals.
Be careful to avoid routing cable around traditionally noisy electrical components such as motor starters,
solenoids, drives, inverters, etc. These components can inductively couple electrical noise onto the
communications wiring.
g.
Route Power Wiring Properly
When using the OCS with 9-32VDC power, route the OCS power conductors away from noise inducing
electrical components and wiring.