Model 201 Installation & Technical
8400-M117-O1 Rev D
3.1.3 Electrical Noise Interference
To prevent electrical noise interference, make certain all other branch
circuits for use with air conditioning and heating equipment, lighting or
other equipment with heavily inductive loads, such as welders, motors and
solenoids are on circuits separate from the weight transmitter. Many of
these disturbances can originate within the cabinet itself and can seriously
affect the operation of the instrument. These sources of disturbances
must be identified and steps must be taken to prevent possible adverse
effects on the instrument. Examples of available alternatives include
isolation transformers, power regulators, uninterruptible power supplies, or
simple line filters.
3.1.4 Transient Suppression
The following recommendations will help to reduce transients:
Always use shielded cables to connect signal wires to the weight
transmitter.
Connect the cable shield (weight transmitter end only) to one of the
enclosure screws on the weight transmitter. Keep wires that
extend beyond the shield as short as possible.
Do not run load cell or signal cables from the weight transmitter
alongside or parallel to wiring carrying AC power. If unavoidable,
position the load cell and signal cables a minimum of 24" away
from all AC wiring.
Always use arc suppressors across all AC power relay contacts (see
recommendations at www.paktron.com/pdf/Quencharch_QRL.pdf).
Use zero voltage switching relays, optically isolated if possible.
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