Johnson Controls VFD66 Series Product/Technical Bulletin page 12

Output
Voltage
(VAC)
230
220
210
200
190
180
170
160
150
150
140
138
130
120
45
35 40
Output Frequency (Hz)
Figure 15: Output Voltage and Frequency vs. Input
Power, 208/230 VAC
Output
Voltage
(VAC)
460
440
420
400
380
360
340
320
300 300
280
276
260
240
45
35 40
Output Frequency (Hz)
Figure 16: Output Voltage and Frequency vs. Input
Power, 400/460 VAC
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
12 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
200
190
180
170
160 Input
Voltage
(VAC)
50 55 60
400
380
360
340
Input
320
Voltage
(VAC)
50 55 60
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.
230
If the supply voltage drops below 276 VAC
220
(60% of 460 VAC), then the VFD66 control stops the
210 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 jumper position on jumper blocks
J7 and J8. See Figure 3, Table 10, and Table 11 for
possible operation scenarios when the jumper position
is not correct for the input device connected to the
VFD66.
Table 10: Possible Operation Scenarios Related to
Jumper Block J7
If the
control is
set for___.
0-10 VDC
460
(J7 jumper
440 installed)
420
0-5 VDC
(J7 jumper
removed)
Table 11: Possible Operation Scenarios Related to
Jumper Block J8
If the control
is set for____.
one input
(J8 installed)
one input
(J8 installed)
two inputs
(J8 removed)
two inputs
(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 12.
And if the The result is___
control
receives___.
0-5 VDC the VFD66 control only
drives the motor at half
of the full motor speed.
0-10 VDC the VFD66 control only
uses 0-5 VDC and the
motor reaches full
speed when the input
signal is at 5 VDC.
And ____ The result is____.
input
devices
are used
two the second input
device is ignored.
none the VFD66 control runs
the motor at full speed
only.
one the VFD66 control runs
the motor at full speed.
none the VFD66 control runs
the motor at full speed
only.