Johnson Controls VFD66 Series Product/Technical Bulletin page 13

Examples
These examples use a VFD66 control rated for
400/460 VAC at 50/60 Hz. The control is used in North
America, so the maximum supply voltage is 460 VAC
at 60 Hz.
•
If the supply voltage is 460 VAC (100% of
460 VAC), the VFD66 control runs the motor at full
speed (460 VAC at 60 Hz).
•
If the supply voltage drops to 368 VAC
(80% of 460 VAC), the VFD66 control can only
provide 368 VAC and the control reduces the
output frequency to 53 Hz.
•
If the supply voltage drops to 276 VAC
(60% of 460 VAC), the VFD66 control can only
provide 276 VAC and the control reduces the
output frequency to 40 Hz.
•
If the supply voltage drops below 276 VAC
(60% of 460 VAC), then the VFD66 control stops
the motor and does not restart it until the supply
voltage rises to at least 276 VAC.
Unexpected Operation
If the VFD66 control operates in an unexpected
manner, check the settings on jumper blocks J7 and
J8 (see Figure 5, Table 12, and Table 13).
Table 12: Jumper Block J7
If the and if the
control is control
set for... receives...
0-10 VDC 0-5 VDC
(J7 jumper
installed)
0-5 VDC 0-10 VDC
(J7 jumper
removed)
The result is...
the VFD66 control only
drives the motor at half of
the full motor speed.
the VFD66 control only
uses 0-5 VDC and the
motor reaches full speed
when the input signal is at
5 VDC.
VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
Table 13: Jumper Block J8
If the control And ___
is set for... input
devices
are used
one input two
(J8 installed)
one input none
(J8 installed)
two inputs one
(J8 removed)
two inputs none
(J8 removed)
Shutdown
The ALARM LED indicates fault conditions and
provides diagnostic information. Constant illumination
of this LED indicates that the motor is overloaded and
the VFD66 control shuts down the motor. When the
ALARM LED flashes, the VFD66 control has shut
down the motor. The number of times the ALARM LED
flashes indicates the cause of the fault. See Table 14.
After shutdown, there is a 30-second time delay before
the VFD66 control initiates an automatic restart. The
result is one of the following:
•
If the fault condition is corrected, the VFD66
control continues to operate. After 500 seconds,
the fault routine resets automatically.
•
If the fault persists, the VFD66 controls lock out
again, requiring reset.
The result is...
the second input
device is ignored.
the VFD66 control runs
the motor at full speed
only.
the VFD66 control runs
the motor at full speed.
the VFD66 control runs
the motor at full speed
only.
13