Electrical Power; Electrical Noise Interference; Transient Suppression - Cardinal 190 Installation, Technical And Operation Manual

Electrical Power

The 190 has been designed to operate from 100 to 240V AC @ 0.4A Max. at 50/60 Hz. Note
that a special order is not required for operation at 230/240V AC.
WARNING! - 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.
The socket-outlet supplying power to the indicator should be on a separate circuit from the
distribution panel and dedicated to the exclusive use of the indicator.
The socket outlet shall be installed near the equipment and shall be easily accessible. Note
that the power cord on the 190 serves as the power disconnect.
The wiring should conform to national and local electrical codes and ordinances and should
be approved by the local inspector to assure compliance.
For outdoor operations, the socket-outlet must provide GFCI (ground fault circuit
interrupter) protection.
On installations requiring 230/240V AC power, it is the responsibility of the customer to
have a qualified electrician install the proper power cord plug that conforms to national
electrical codes and local codes and ordinances.

Electrical Noise Interference

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:
 Always use shielded cables to connect signal wires to the weight indicator.
 Secure the cables in the cable clips provided inside the indicator.
 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.
 Do not run load cell or signal cables from the weight indicator 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.
 Use zero voltage switching relays, optically isolated if possible.
6 8400-M022-O1 Rev K  Model 190 Indicator