Power at VFD & Compressor
VFD Closes 3CR Relay
Press “START” on Compressor
The Intellisys Closes 1CR Relay to “START” the VFD. The
Compressor begins to run Unloaded with the VFD in SETUP 1
The Intellisys loads the Compressor and closes 2CR Relay
switching to SETUP 2. Variable Speed and Flow operation
continues until the Intellisys Unloads the Compressor.
The Intellisys Unloads the Compressor, opening 2CR Relay.
This switches the VFD to SETUP 1. The Compressor slows
down to minimum speed for the duration of the Unload cycle.
The Compressor continues to cycle between Load and Unload
(2CR Relay closing/opening) until one of the following
happens:
Has the Intellisys
decided the Unload time
has been long enough
to shut the
Compressor off?
Has the VFD Faulted
for any reason?
(I.E.: High Current,
Loss of Phase, etc.)
The Intellisys shuts down the Compressor and
Opens 1CR Relay, stopping the VFD power to
the motor.
The VFD Drive opens 3CR Relay telling the
Intellisys to Stop the Compressor immediately,
similar to the Compressor “Emergency Stop”
button being pressed.
The Compressor and the VFD are
stopped in “Stand-by” mode awaiting a
Start signal.
The Compressor and VFD Stop, both
flashing alarms.
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