Revision 1.1
Variphase User Manual
Page 19
Mechanical Specifications
Installation
Variphase must be mounted in an enclosure that provides electrical, safety and environmental
protection (not required for NEMA1 option). Variphase must be mounted in a Pollution Degree 2
environment as defined in UL508C.
Normally, only non-conductive pollution occurs, however temporary conductivity is
expected. Pollution degree 2 is obtainable by reducing possibilities of conductive pollution
and reducing possibilities of condensation or high humidity
This can normally be achieved by mounting Variphase in a suitable enclosure and locating it so it
will not be affected by condensation. The mounting position and method must also meet UL508c
requirements for electrical spacings.
Refer to Variphase Datasheets for Mechanical Dimensions.
Variphase 8 Amp (ACV108x) and Variphase 14 Amp (ACV114x) models have special mounting
requirements when operated at or near full-load rating. Under these conditions, they must be
securely mounted to an aluminum surface with an area of at least 1sqft. This provides additional
heat dissipation. Refer to individual datasheets for specific requirements.
Hall Sensor for Speed Sensing and Regulation
Closed-loop control (or speed sensing in open-loop mode) requires a hall-effect sensor to monitor
fan rotation. The hall-effect sensor should be located so that a magnet, mounted on the impeller
or shaft, passes it once every revolution. A slotted switch can also be used by following the
instructions in the relevant application note.
Frequently Asked Questions
Q.
In Analog Control Modes, does the network interface still function?
A.
Yes. The network connection can still be used to monitor Variphase parameters and set
certain parameters.
Q.
Can an AirCare console read actual motor speed in all Control Modes?
A.
Yes. Provided a Hall-effect Tach Sensor is installed.
