Johnson Controls VFD66 Series Product/Technical Bulletin page 8

Factory default settings have all the jumpers in the
installed position and the potentiometers set fully
clockwise. (See Table 6, Figure 5 and Figure 11.)
Table 6: Jumper Settings by Function
Jumper Function
Block
J2 Mode of
Operation
J3
J4 Acceleration/
Deceleration
Time
J5 Internal/
External P1
J6 Internal/
External P2
J7 Input Signal
Type
J8 Number of
Input Signals
Used
J9 Maximum
Output
Frequency
* Do not discard jumpers. (See Figure 11.)
To place a jumper in the removed position, reposition
the jumper so that it is connected to only one pin on
the jumper block. Keep the jumper because it may be
needed in the future. To place a jumper in the installed
position, place the jumper on both pins. (See
Figure 11.)
Jumper blocks J2 and J3 establish input modes and
work in conjunction with potentiometers P1 and P2.
See Selecting an Input Mode.
Pins
Jumper
Jumper
Block
Figure 11: Jumper Placement on Pins
Jumper blocks J5 and J6 have jumpers installed on
the two middle pins of each jumper block. These
jumpers activate the internal potentiometers. Moving
the jumpers from the factory-installed position disables
the internal potentiometers.
8 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
Jumper Jumper
*
Removed Installed
See Selecting an Input Mode.
5 Seconds 30 Seconds
Do not move the jumpers
from the factory-installed
position unless installing the
External Potentiometer
Replacement Cover.
0-10 VDC 0-5 VDC
Dual Single
50 Hz 60 Hz
Installed
(positioned
on both pins)
Removed
(positioned
on one pin)
Jumpers on J7 and J8 must be set for the correct input
voltage range and number of input devices. (See
Table 6.) Jumper block J7 sets the voltage range for
the input signal(s). If the jumper on jumper block J7 is
incorrectly set, the control may operate in an
unexpected manner. See Troubleshooting.
Jumper block J8 selects the number of input signals
used. When dual inputs are selected, Terminal 3 of
TB3 (TB3-3) is enabled. The VFD66 control varies the
speed of the fan motor in accordance with the higher
value of the two input signals received. If the jumper
on jumper block J8 is incorrectly set, the control may
operate in an unexpected manner. See
Troubleshooting.
Jumper block J9 selects maximum frequency output of
the control. Remove the jumper for 50 Hz motors,
typically used in Europe. Install the jumper for 60 Hz
motors, typically used in North America. Power to the
VFD66 control must be disconnected and reconnected
before frequency changes take effect.
De-Rating the VFD66 Control for High
Temperatures and High Altitudes
Ambient air temperature and altitude of the installation
affect the maximum output ampere rating of the
VFD66 control. High air temperature makes the heat
sink less effective in dissipating the generated heat.
High altitudes have thinner air than lower altitudes,
which is less effective in dissipating heat. The less
effective the heat sink is, the lower the maximum
output ampere rating of the VFD66 control.
Temperature De-Rating
For temperatures up to 122°F (50°C), the maximum
output ampere rating is unaffected by temperature. At
temperatures between 122°F (50°C) and 140°F
(60°C), the maximum output ampere rating is
decreased. The VFD66 controls are not designed to
operate in temperatures above 140°F (60°C).
See Figure 12 for temperature de-rating for
208/230 VAC models. See Figure 13 for temperature
de-rating for 400/460 VAC models.