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VFD68 Variable Frequency Drives
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VFD68Bxx and VFD68Cxx Operation Panel
Operation Modes
The VFD68 drive’s mode of operation is indicated by the mode of operation LEDs (labeled PU, EXT, and NET)
on the drive’s operation panel (Figure 29).
PU Mode:
The Parameter Units (PU) mode is manual control mode. In PU mode, the drive and motor are
completely controlled using the buttons and the setting dial on the drive’s user interface. No external analog
signals or network signals control the drive operation. The PU mode is typically used to set up, test, and
troubleshoot the drive and motor operation using controlled input signal values.
EXT Mode:
In the External (EXT) mode, the drive and motor respond to a signal or signals from one or two
(external) analog input signal devices, such as pressure transducers or analog controllers. This is the typical
mode of operation for the drive when it controls a condenser fan or other three-phase HVACR motor
application.
PU/EXT Mode:
In PU/EXT mode, the drive responds to the connected external signal devices and the drive
setup values can be edited. The PU/EXT mode is typically used to set up your drive for initial operation, or to
adjust setup parameters on an operating application.
NET Mode:
In Network (NET) mode, the drive connects to and communicates over a network bus with other
network devices and receives operating (Read/Write) commands from a master device on the network. The
Network mode is not currently supported on VFD68 drives.
The VFD68 drives are RS485, RTU-compliant ModBus® slave devices. For more information, see
Appendix 4: VFD68Bxx and VFD68Cxx ModBus RTU RS485 Communications Bus Specifications
.
MON Mode:
Shows motor speed represented as frequency (Hz) or RPM.
RUN, MON, PRM LEDs
The RUN, MON, and PRM LEDs provide drive status and indicate the type of information being displayed on
the operation panel monitor.
RUN LED:
The LED state (on steady, flashing, or flickering) provides information regarding the drive and motor
run status. See Figure 29 for more information.
MON LED:
Indicates that the monitor is displaying the drive’s run status. Press (SET) to scroll through run
frequency, output amperes, and output voltage.
PRM LED:
Indicates that the monitor is set to display parameters and parameter values and allows you to view
and edit parameter values.