Cardinal Industries 225 WEIGHT INDICATOR - Manual (Page 11)

SITE PREPARATION, CONT.
The Model 225 Weight Indicator is a precision weight-measuring instrument. As with any
precision instrument, it requires an acceptable environment to operate at its peak performance
and reliability. This section is provided to assist you in obtaining such an environment.
Electrical Power
The 225 has been designed to operate from 90 to 264 VAC at 50/60 Hz. Note that a special
order is
U
not
U
required for operation at 230 VAC.
CAUTION! - To avoid electrical hazard and possible damage to the indicator,
DO NOT, under any circumstance, cut, remove, alter, or in any way bypass the
power cord grounding prong.
On installations requiring 230 VAC power, it is the responsibility of the customer to have a
qualified electrician install the proper power cord plug which conforms to national electrical
codes and local codes and ordinances.
The power outlet for the indicator should be on a separate circuit from the distribution panel.
This circuit should be dedicated to the exclusive use of the indicator. The wiring should
conform to national and local electrical codes and ordinances and should be approved by the
local inspector to assure compliance.
To prevent electrical noise interference, make certain all other wall outlets 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 indicator. Many of
these disturbances originate within the building 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.
Transient Suppression
The following recommendations will help to reduce transients:
y Always use shielded cables to connect signal wires to the weight indicator.
y Secure the cables in the cable clips provided inside the indicator.
y Connect the cable shield (indicator end only) to a ground point inside the indicator.
Keep wires that extend beyond the shield as short as possible.
y Do not run load cell or signal cables from the weight indicator along side 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.
y Always use arc suppressors across all AC power relay contacts (see recommendations
at
HU
http://www.paktron.com/pdf/Quencharch_QRL.pdf
UH
).
y Use zero voltage switching relays, optically isolated if possible.
8200-M538-O1
y 225 Installation
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