Watlow Series 920 Microprocessor-Based Ramping Control Manual de usuario descargar pdf (Pagina 22)

How to Check for Ground Loops

To check for ground loops, disconnect the ground wire at the ground termina-

tion. Measure the resistance from the wire to the point where it was

connected-

The ohmmeter should read a high ohm value.

you have a low ohm value

across this gap, that means there is at least one ground loop present in your

system.

Also, check for continuity; your reading should be “open”.

If you do find conti-

nuity, you must now begin looking for the ground loops. Begin disconnecting

grounds in the system one at a time, checking for continuity after each discon-

nection. When continuity reads “open” you have eliminated the ground loop(s).

Also as you reconnect grounds, keep making the continuity test. It is possible

to reconnect a ground loop.

Noise Suppression Devices

Available from Watlow

Watlow Controls stocks a few key noise suppression parts. You may order

these by calling your local Watlow distributor.

Table 7

Noise

Suppression

Device

Ratings.

Item

Electrical

Ratings

Common Mode Line Filter

250V,

3 Amp

Metal

Oxide

Varistor

15OV,

Joule

Part Number

0804-0196-0000

0802-0273-0000

MOV

130V,

38 Joule

0802-0304-0000

MOV

275V,

75 Joule

0802-0266-0000

MOV

275V,

140 Joule

0802-0405-0000

Line Filtering Configurations For Controls

NOTE:

For

very

“dirty” or

critical

applications,

use micro-com-

puter-regulated

power

supply

Uninterruptable

Power Supply

(U.P.S.)

These three diagrams show you filter configurations for removing input power

noise. Choose the one best suited for your system if you are unsure which one

to use.

WATLOW

Series Manual

920 User's

Maual

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