Johnson Controls VFD66 Series Product/Technical Bulletin page 10

Commissioning
Table 8: Mode Selections According to Input Device
Input Device
1
Any
A350P
P352PN
P35AG-9200
Any 0-5 VDC Devices
Any 0-10 VDC Devices
P399 or Other Electronic
Pressure Transducer
1. Setting the mode to manual ignores the input devices.
2. Position of jumper on J7 depends on the input device used.
3. Input type varies with device.
4. Transducer may provide 0-5 VDC or 0-10 VDC signal. A 0-10 VDC transducer must be separately powered. Note that
a non-ratiometric transducer will have more error.
Selecting an Input Mode
See Table 8 for the available input mode options for
the VFD66 control. The factory–set mode is Manual
Input mode.
Manual Input Mode
Manual Input mode allows the user to set a constant
motor speed. This can be used where manual control
is desired or while repairing input signal devices or
obtaining replacements. In Manual Input mode, the input
device signals are disregarded. Motor speed is controlled
by adjusting the P1 potentiometer. Potentiometer P2 is
disregarded and adjusting P2 has no effect.
Table 9: Manual Input Mode
J2 Jumper J3 Jumper
Position Position
Installed Installed
Standard Input Mode
Standard Input mode is the most commonly used
mode. The majority of input devices compatible with
the VFD66 controls are used with this mode. The input
device determines the setpoint and proportional band.
10 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin
Input Type Input Mode
1
None Manual
Temperature Standard
Pressure Standard
Pressure Standard
3
Any Standard
3
Any Standard
Pressure Electronic Pressure
Transducer
P1: P2:
Motor Speed Not
Used
Adjusts constant —
speed of motor
(0-100%)
J2 Jumper J3 Jumper
Position Position
Installed Installed
Installed Removed
Installed Removed
Installed Removed
Installed Removed
Installed Removed
Removed Removed or
Installed
Table 10: Standard Input Mode
J2 J3
Jumper Jumper
Position Position
Installed Removed
P1 adjusts the minimum speed of the motor. The
minimum speed is adjustable from 0 to 50% of total
motor speed.
P2 determines whether the motor idles at minimum
speed or shuts off at minimum speed. P2 must be set
at full Counterclockwise (CCW) or full Clockwise (CW)
position; intermediate settings have no effect.
Figure 14 illustrates three possible motor speed
curves. When P2 is rotated fully CCW, the motor idles
at the minimum speed set by P1 at input values below
the end of the proportional band (Curve A in
Figure 14). When P2 is rotated fully CW, the motor
shuts off at the minimum speed set by P1 when the
input is below the bottom end of the proportional band
(Curve B in Figure 14).
In Curve C, the minimum motor speed (P1) is set at
0% of maximum motor speed and the position of
P2 has no effect.
J7 Jumper
2
Position
NA
Removed
Removed
Installed
Installed
Removed
Removed or Installed
4
P1: P2: Motor
Minimum Action at
Motor Minimum
Speed Speed
Can be set at CCW:
0-50% of Motor idles.
maximum
CW: Motor
motor speed.
shuts off.
4