Additional Control Setpoints
Misc. Control
•Control Mode = Drop-down box allows selection of current operating mode, from the list of allowable modes.
•High Motor Amps (Unloading) = This control feature will limit the compressor capacity when the compressor motor amps reaches these load limiting set-points. When the set-points are set properly, this control feature will prevent the motor from operating at excessive high amp conditions, which will help to prevent the com- pressor starter from stopping the compressor on “motor overload” conditions.
•Stop Load = prevents the compressor from loading when the set-point is reached. For a 1.15 SF motor, this value is the FLA value stamped onto the motor nameplate.
•Force Unload = forces an unload condition when this set-point is reached. For a 1.15 SF motor, this value is FLA value (from motor nameplate) x 1.15. The unload pulse is released when the motor amps lands just above the FLA setting.
•High Discharge Pressure (Unloading) = This control feature is active in Suction Pressure or Process Tempera- ture Capacity Control mode. This control feature will limit the compressor from loading when the compressor discharge pressure reaches these load limiting conditions. When the set-points are set properly, this control feature will prevent the compressor from experiencing excessive high discharge pressure that could result in a high discharge pressure failure. The high discharge pressure unloading set-points over-ride the Suction Pres- sure or Process Temperature Capacity Control Set-points.
