Technical information

230V FX Series Positioning Drive Reference Manual

suppresser networks greatly extend the life of contacts controlling the coil because the

transient energy, which can easily reach 1000 volts, shunts through the suppresser rather than

arcing across the controlling contacts as they open. Some suppressor networks extend the

time needed to engage the relay.

Enclosure Requirements

FX drives are designed for the industrial environment. However, no sophisticated electronic

system can tolerate atmospheric contaminants such as moisture, oils, conductive dust,

chemical contaminants and metallic particles. Therefore, if your FX drive is going to be

subjected to this type of environment, you must mount it vertically in a metal NEMA type 12

enclosure.

If the equipment environment exceeds 26° C (80° F), you should consider forced air cooling.

The amount of cooling depends on the size of the enclosure, the thermal transfer of the

enclosure to the ambient air and the amount of power being dissipated inside the enclosure.

The size of the enclosure will determine how long it takes the temperature inside to rise. It

will also affect the thermal transfer capacity of the enclosure. Normally, the larger the

enclosure the better the thermal transfer. Thermal transfer is also affected by venting, forced

air cooling and enclosure material.

It is not recommended to mount the FX drive in a non-vertical orientation.

It is not recommended to mount the FX drive on thermal insulating material, such as wood

or plastic.

Doing either of the above will drastically reduce the drive’s output power.

Power Dissipation

The amount of power being dissipated in the enclosure will depend on the equipment inside

and system variables such as acceleration and deceleration rates, continuous torque

requirements and load inertia. The table that follows gives the “Worst Case” power

dissipation figures for FX amplifiers. These figures can be used to determine enclosure size

and cooling requirements.

In general the drive power stages are 90 to 95 percent efficient depending on the actual point

of the torque speed curve the drive is operating. The shunt power losses depend greatly on the

regeneration requirements and will be lower with lower inertial loads. The Logic power losses

does not change no matter what the load is.

The values shown in the table that follows represent the maximum dissipation that could

occur with the drive / motor combination specified.