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Capacity Ramp Start Limiting
The CAPACITY RAMP START feature has been provided to limit capacity increases after the
compressor starts. The operator can define the total time to limit capacity increases from the minimum
capacity to 100% capacity. Once the compressor has started and the minimum capacity has been
achieved, the capacity ramp timer is started, and further capacity increases will be limited. The
maximum allowable capacity will be gradually increased from the minimum capacity to 100% over the
ramp duration. When the capacity is limited due to this feature, the RECIP state will display
“LIMIT:CAP”. Unlike other limiting and unloading, the compressor is not considered fully loaded
when in this state.
The Capacity Ramp Start feature is available in Automatic, Auto-Remote and Sequenced mode.
When in Sequenced mode, capacity changes are limited when the compressor is a Fully Loaded
machine. If a fully loaded compressor is forced to unload for any reason, the capacity ramp will
engage from the current capacity position once the limiting condition has gone away. The Capacity
Ramp Start parameters are set-up on the Capacity set-point screen.
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