Johnson Controls VFD66 Series Manual

Product/Technical Bulletin VFD66

Issue Date November 19, 2002

Code No. LIT-125467 www.johnsoncontrols.com

Part No. 24-7664-1555, Rev. D

VFD66 Series Condenser Fan Speed Controls

The VFD66 Series Condenser Fan Speed Controls

regulate the speed of 3-phase condenser fan motors in

refrigeration and Heating, Ventilating, and Air

Conditioning (HVAC) systems by varying the

frequency and voltage of the power supplied to the

motor.

The VFD66 control accepts an input signal from the

P35 Pressure Transducer, P399 Electronic Pressure

Transducer, System 350



pressure or temperature

controls, or any other device that provides a 0-5 VDC

or 0-10 VDC analog output signal.

The application-specific design of the VFD66 control

provides a simple interface, which makes the control

easy to understand and operate. Figure 1: VFD66 Condenser Fan Speed Control,

NEMA 4 and NEMA 1 Enclosures

Features and Benefits

❑Isolated Input Circuitry Permits application with 0-5 VDC or 0-10 VDC

controllers, sensors, transducers, and

Johnson Controls System 350 controls

❑Simultaneous Acceptance

of Two Similar Inputs Allows use on dual refrigeration circuits

cooled by a single fan

❑Compact Design Provides installation ease and flexibility

❑Three-Phase, 208/230, or

400/460 VAC Models Handle three-phase motors ranging up to

10.6 amperes at 208/230 VAC or 5.5 amperes

at 400/460 VAC

❑Few End-User Settings Provide fast and easy installation and setup

2 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin

Application

IMPORTANT: The VFD66 Series Condenser Fan

Speed Controls are intended to control equipment

under normal operating conditions. Where failure or

malfunction of a VFD66 control could lead to an

abnormal operating condition that could cause

personal injury or damage to the equipment or other

property, other devices, (limit or safety controls) or

systems (alarm or supervisory) intended to warn of,

or protect against, failure or malfunction of the

VFD66 control must be incorporated into and

maintained as part of the control system.

The VFD66 control accepts input signals from a variety

of pressure transducers, temperature sensors, and

low-voltage controllers to provide continuous response

to changing condenser load conditions.

The VFD66 control allows the system to:

•maintain optimum condenser head pressure in low

ambient temperature conditions

•eliminate short-cycling in low ambient

temperatures or changing load conditions

•match the condenser fan speed to the load on the

condenser, which increases the efficiency of the

refrigeration system. This can reduce electricity

cost and help maintain a constant evaporator

temperature.

The VFD66 control also:

•stabilizes the condenser head pressures, which

helps optimize compressor operation and can

reduce wear and extend compressor life

•eliminates the condenser fan short-cycling, which

can reduce motor repair and replacement costs

•stabilizes evaporator temperatures, which can

extend refrigerated product life and provide more

consistent comfort cooling

Installation

Use the information in this section to install the

VFD66 control.

Dimensions

Figure 2, Figure 3, and Figure 4 show dimensions of

the enclosures used on the VFD66 controls. See

Figure 2 for information on models with NEMA 1

enclosures. See Table 1, Figure 3, and Figure 4 for

information on models with NEMA 4 enclosures.

Ter mi na l

Access

Cover

Ter mi n al

Cover

Screw

Heat

Sink

7-1/2

(190)

(177)

3 conduit openings

7/8-in. (22 mm) actual size

1/2-in. trade size

1/4-in. (6 mm)

mounting screws,

4 places

6-1/4

(159)

4-3/4

(120)

4-5/8

(117)

7-1/4

(184)

Diagnostic

Light-Emitting

Diodes (LEDs)

Figure 2: VFD66 NEMA 1 Enclosure Dimensions

Table 1: NEMA 4 Enclosure Size by Types/Models

NEMA 4

Enclosure Size

Models

Small VFD66AEE, VFD66BEE

Large VFD66CEE, VFD66DEE

Ter mi n al

Access

Cover Te rm i na l

Cover

Screws (4)

Diagnostic

Display

3 conduit openings

7/8-in. (22 mm) actual size

1/2-in. trade size 1/4-in. (6 mm) mounting screws,

4 places

Heat

Sink

9-1/16

(230)

4-3/4

(120)

7-7/16

(189)

4-5/8

(117)

8-13/16

(224)

8-5/16

(211)

Figure 3: Small VFD66 NEMA 4 Enclosure

Dimensions

VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin 3

Diagnostic

Display

3 conduit openings

7/8-in. (22 mm) actual size

1/2-in. trade size

1/4-in. (6 mm)

mounting screws,

4 places

Te rm in a l

Access

Cover

Ter m in a l

Cover

Screws (4)

4-3/4

(120)

9-1/16

(230)

4-5/8

(117)

7-7/16

(189)

11-5/16

(287)

11-13/16

(300)

Figure 4: Large VFD66 NEMA 4 Enclosure

Dimensions

Accessories

Table 2 lists input devices and other accessories used

with the VFD66 controls, available from

Johnson Controls/PENN.

Table 2: Pressure Transducers, Temperature Controls, and Other Accessories for VFD66 Series Controls

Product Code

Number

Description Information

P35AG-9200R Pressure Transducer

0-350 psi range

Refer to P35 Pressure Transducer and VFD66 Control

Application Note (LIT-121418) for more information.

P399AAA-1C

P399AAC-1C

Electronic Pressure Transducer,

0-100 psi range

P399GAA-1C Electronic Pressure Transducer,

0-200 psi range

P399BAA-1C

P399BAC-1C

Electronic Pressure Transducer,

0-500 psi range

P399CAA-1C

P399CAC-1C

Electronic Pressure Transducer,

0-750 psi range

P399AAA-1-200C

P399AAC-1-200C

P399BAA-1-200C

P399BAC-1-200C

P399CAA-1-200C

P399CAC-1-200C

Electronic Pressure Transducer

(as above) packaged with

WHA-P399-200C

WHA-P399-200C Wire Harness with pigtail leads,

6-1/2 ft (2 m)

WHA-P399-400C Wire Harness with pigtail leads,

13 ft (4 m)

WHA-P399-600C Wire Harness with pigtail leads,

19-5/8 ft (6 m)

Refer to P399 Series Electronic Pressure Transducers

Product/Technical Bulletin (LIT-125515) for more information.

Continued on next page . . .

4 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin

Product Code

Number (Cont.)

Description Information

A350PS-1C Proportional Plus Integral

Temperature Control

Refer to System 350 A350P Electronic Proportional Plus Integral

Temperature Control Product/Technical Bulletin (LIT-930020) for

more information.

P352PN-3C Proportional Plus Integral

Pressure Control

Refer to System 350 P352PN Electronic Proportional Plus

Integral Pressure Controls for PSI Applications Product/Technical

Bulletin (LIT-930044) for more information.

VFD66-CVR-1C External Potentiometer

Replacement Cover

Refer to Installing the External Potentiometer Replacement Cover

Application Note (LIT-121419) for more information.

Mounting

CAUTION: Risk of Thermal Damage.

The VFD66 control can generate and dissipate

significant heat. Mount the control on a metal,

concrete, or cinderblock mounting surface. Mounting

the VFD66 control on surfaces made of wood or

other heat-sensitive material may result in damage

to the mounting surface.

Follow the guidelines below when mounting a

VFD66 control:

•Mount the VFD66 control on a vertical surface with

the heat sink fins oriented vertically and the

conduit holes facing down.

•Provide a minimum of 4 in. (102 mm) clearance

around the heat sink.

•Ensure that output power wiring between the

VFD66 control and the motor does not exceed

50 ft (15 m).

•Mount NEMA 1 models indoors, in a location

protected from explosive vapors, corrosive gas,

water, and dust.

•Mount NEMA 4 models indoors or outdoors in a

location protected from explosive vapors,

corrosive gas, and dust, and out of direct sunlight.

Ambient air temperature and installation altitude affect

the maximum output rating of the VFD66 controls (see

De-Rating the VFD66 Control for High Temperatures

and High Altitudes).

Wiring

WARNING: Risk of Electrical Shock.

The printed wiring board and its components are at

AC line voltage. Direct or indirect contact with line

voltage can result in personal injury or death.

WARNING: Risk of Electrical Shock.

The VFD66 controls remain electrically charged for a

period of time after power is removed. To avoid

possible electrical shock, wait at least 5 minutes

after AC supply power has been disconnected from

the VFD66 controls before servicing the control.

Failure to wait until the VFD66 control fully

discharges could cause electrical shock,

personal injury, or death.

CAUTION: Risk of Equipment Damage.

Connect each of these items to the VFD66 controls,

using a separate conduit for each set of wires:

•Line Voltage Supply Power

•Line Voltage Output Power to Fan Motor

•Low Voltage Signals from Input Devices

Running different voltage and frequency wires in the

same conduit can create electronic noise or

harmonics, which may damage the condenser fan

motors.

Read this entire section, including the information on

emissions compliance, before wiring the

VFD66 control. See Figure 5 for a view of the circuit

board components and the conduit entry bracket.

Accessing the Interior

Remove the terminal access cover (see Figure 2,

Figure 3, and Figure 4) to access terminal blocks,

jumper blocks, and internal potentiometers (see

Figure 5).

VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin 5

NEMA 1 Enclosure

Follow these steps to remove the terminal access

cover:

1. Remove the terminal cover screw.

2. Push downward on the ventilation holes.

3. Pull outward on the top of the terminal access

cover.

NEMA 4 Enclosure

Follow these steps to remove the terminal access

cover:

1. Remove the four terminal cover screws.

2. Grasp the rubber tab at the bottom of the terminal

access cover.

3. Pull the tab outward and upward to remove the

terminal access cover.

J7 J8

TB3

1 2 34

TB1

L3 L2 L1

TB2

T1 T2 T3

J5 J6 J2 J3 J4 J9

Circuit

Board

(cropped

view)

Conduit

Entry

Bracket

Potentiometers

Jumper

Blocks

for

Adjusting

VFD66

Control

Jumper Blocks for

Input Device Selection

Ground

Connection Terminals

Route wiring from input devices

through this conduit entry hole.

Input

Device

Power

Input

Output

Fan

Motor

Figure 5: Jumper Block, Terminal Block, and

Potentiometer Locations

Table 3: Terminal Blocks

Terminal

Block Label

Terminal Block Function Electrical Rating Terminal Terminal Function

L1 Line 1 Input

L2 Line 2 Input

TB1 Input Line Voltage Power

L3 Line 3 Input

T1 Line 1 Output

T2 Line 2 Output

TB2 Output Line Voltage Power to Fan

Motor

See Technical

Specifications.

T3 Line 3 Output

1 5 VDC power supply

2 First signal input

3 Second signal input*

TB3 Low-voltage Input Signals,

0-5 VDC Power Supply

0-5 VDC or 0-10 VDC

4 Common

1 Switch contact

TB4 Alarm Output for User-Installed

Alarm Device

100 mA at 24 VAC/30 VDC

2 Switch contact

* See Adjusting the Control Settings.

6 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin

Wiring an Input Device

Connect a low-voltage input signal device to Terminal

Block TB3 (see Table 3 and Figure 5). See Table 4,

Figure 6, Figure 7, and Figure 8 for information on

wiring specific Johnson Controls/PENN™ input

devices to the VFD66 controls.

Table 4: Wiring Johnson Controls/PENN

Input Devices

Input Device Input Device

Terminal

VFD66 Control

TB3 Terminal

2 2 (or 3)*

P35AG-9200R

Transducer

V 2 (or 3)*

A350PS-1C or

P352PN Series

Controls C4

Red 1

White 2 (or 3)*

P399 Series

Transducers

Black 4

* Use Terminal 3 for input from a second input device.

TB3

3 4

P35 Transducer

Figure 6: Wiring P35 Transducers to VFD66

Terminal Block 3

Red

White Black

Red (5 VDC Supply)

White

(Output Signal)

TB3

Black

(Common)

Figure 7: Wiring P399 Transducers to VFD66

Terminal Block 3

TB3

VDC

24V

A350P Control

or P352PN Control

Second A350P Control

or P352PN Control

(if used)

2 4

C: Common (-)

V: 0-10 VDC Output

Figure 8: Wiring A350P Controls or P352PN

Controls to VFD66 Terminal Block 3

Wiring an External Alarm to the VFD66 Control

Some models of the VFD66 controls feature an alarm

output. The Metal Oxide Silicon Field Effect Transistor

(MOSFET) alarm output activates when a permanent

fault condition occurs. See Table 14, Figure 5, and

Figure 9.

Visual

or Audible

External Alarm

Device

Alarm output

is rated for 100 mA

at 30 VDC/24 VAC.

24VAC/30 VDC

VFD66 Control

Terminal Block T 4B

Figure 9: Wiring the Alarm Output

Wiring Power

Select wire size for field wiring based on a wire

insulation temperature resistance rating of 167°F

(75°C), with a maximum wire size of 12 AWG. Use

only stranded copper wire, rated for at least 600 volts.

Maximum terminal tightening torque for all VFD66

controls electrical terminals is 5 lb·in (0.565 N·m).

VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin 7

Ensure that the motor(s) and VFD66 control are

securely and adequately grounded. Use the two

ground connection terminals on the conduit entry

bracket. (See Figure 5.) Use a ground connection

terminal similar to AMP Part Number 34162 for

16-14 AWG wire size or AMP Part Number 322455 for

12-10 AWG wire size.

Wiring Input Power

CAUTION: Risk of Equipment Damage.

Wiring line-voltage input power to the wrong terminal

block will damage the VFD66 control. Wire input

power ONLY to Terminal Block 1 (TB1).

CAUTION: Risk of Equipment Damage.

Use of an incorrect power source may cause

equipment damage. Ensure that the power source

conforms to the requirements of the equipment.

The input line-voltage supply power to L1, L2, and L3

(Terminal Block 1) must be fused. Use fuses sized for

250% of the input current rating of the VFD66 control.

For example, if a VDF66 control is rated at 4 amperes

input current, use a 10-ampere fuse. Do not use fuses

with an extremely fast-opening characteristic (rectifier

fuses).

Wiring Output Power

IMPORTANT: The output phase rotation on TB2 at

T1(U), T2(V), T3(W) is ABC. If the motor rotation is

incorrect, interchange any two motor leads on TB2.

Do not make changes to the input power supply

wiring.

The length of output power wires between the

VFD66 control (TB2) and the motor must not exceed

50 ft (15 m).

Emissions Compliance

If the VFD66 control is used in commercial or

residential applications, FCC and DOC compliance

may require the addition of the items in Table 5 to

reduce electronic noise emissions. Installation of the

parts listed in Table 5 is required for EU Directive

Compliance (CE mark):

•72/23/EEC (Low Voltage Directive)

•89/336/EEC (EMC Directive)

Table 5: Emissions Compliance

Required Item Suggested Model

Axx, Bxx, Dxx,

and Fxx

Schaffner® EMV AG

FN 258-7/29*

EMI

Filter for

VFD

Types: Cxx and Exx Schaffner EMV AG

FN 258-16/29

Ferrite Core

(Two Required)

Fair-Rite® No.

04431672451

Shielded Power Wiring Any 3-conductor, braided,

shielded cable

* Contact Schaffner and Fair-Rite for local distributors.

TB3 TB1 TB2

1 2 34L1

L2 L3 T1 T2 T3

Motor

EMI Filter

Shielded

Wiring

Separate input and output cables. Do not run input cables

alongside output cables. Do not bundle input and output

cables together.

Input

Device(s)

Ferrite Cores

2, 3 or 4 Conductor

Shielded Cables

Alarm

Device

Figure 10: CE/FCC/DOC Compliance Wiring

Setup and Adjustments

This section describes how to set up the

VFD66 control. Remove the terminal access cover to

access the jumper blocks and internal potentiometers.

See Accessing the Interior.

Adjusting the Control Settings

WARNING: Risk of Electrical Shock.

The printed wiring board and its components are at

AC line voltage. Disconnect power from the control

before making any adjustments. Do not touch any

tool to any part of the wiring board while power is

applied. Failure to follow these precautions can

result in personal injury or death.

Control settings are established by positioning

six jumpers and adjusting two potentiometers.

8 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin

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

Block

Function Jumper

Removed*Jumper

Installed

Mode of

Operation

See Selecting an Input Mode.

J4 Acceleration/

Deceleration

Time

5 Seconds 30 Seconds

J5 Internal/

External P1

J6 Internal/

External P2

Do not move the jumpers

from the factory-installed

position unless installing the

External Potentiometer

Replacement Cover.

J7 Input Signal

Type

0-10 VDC 0-5 VDC

J8 Number of

Input Signals

Used

Dual Single

J9 Maximum

Output

Frequency

50 Hz 60 Hz

* 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.

Jumper

Pins

Removed

(positioned

on one pin)

Installed

(positioned

on both pins)

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.

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.

VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin 9

Amperes

Temperature

10.0

5.0

7.5

2.5

122 F

50 C

140 F

60 C

131 F

55 C

126 F

52 C

136 F

58 C

4.0

10.6

VFD66Axx Type

VFD66Cxx Type

VFD66Exx Type

Figure 12: 208/230 VAC Temperature De-Rating

Amperes

Temperat ure

6.0

3.0

4.5

1.5

122 F

50 C

140 F

60 C

5.5

1.8

3.6

2.2

131 F

55 C

126 F

52 C

136 F

58 C

VFD66Fxx Type

VFD66Dxx Type

VFD66Bxx Type

Figure 13: 400/460 VAC Temperature De-Rating

Altitude De-Rating

See Table 7 for altitude multipliers. Use the following

formula to determine the adjusted rating:

Temperature

De-Rated

Maximum

Output

Amperes

XAltitude

Multiplier =

De-Rated

Maximum

Output

Amperes

Table 7: Altitude Multipliers for De-Rating

Altitude Range Altitude Multiplier

0-3300 ft (0-1000 m) 1.0

3300-4300 ft (1000-1305 m) 0.97

4300-5300 ft (1305-1610 m) 0.94

5300-6300 ft (1610-1915 m) 0.91

6300-7300 ft (1915-2220 m) 0.88

7300-8300 ft (2220-2525 m) 0.86

8300-9300 ft (2525-2830 m) 0.83

9300-10300 ft (2830-3135 m) 0.80

10300-11300 ft (3135-3440 m) 0.78

De-Rating Examples

For these examples, the control used is a VFD66Exx

type. See Figure 12, Figure 13, and Table 7.

•If a VFD66Exx type (208/230 VAC) is used and

the temperature is below 122°F (50°C), the VFD66

control may be used for loads up to 10.6 amperes

at any altitude below 3300 ft (1000 m).

•If the temperature around the VFD66 control

reaches 140°F (60°C), the rating is different.

According to Figure 12, the VFD66 control is rated

for only 7.5 amperes at 140°F (60°C).

•If the VFD66 control is used in Denver, Colorado

(altitude 5200 ft), the output rating is reduced.

(See Table 7.) When the temperature is less than

122°F (50°C), the VFD66 control is rated for

9.96 amperes, as shown by the equation:

De-Rated Maximum Output Amperes = 10.6 Amperes

x 0.94 = 9.96 Amperes

•If the VFD66 control is used in Denver, Colorado

(altitude 5200 ft), and the ambient temperature

reaches 140°F (60°C), then the VFD66 control is

de-rated to a 7.5-ampere maximum current draw

due to the high ambient temperature and is further

de-rated to 7.05 amperes of current draw because

of high altitude.

De-rated Maximum Output Amperes = 7.5 Amperes x

0.94 = 7.05 Amperes

10 VFD66 Series Condenser Fan Speed Controls Product/Technical Bulletin

Commissioning

Table 8: Mode Selections According to Input Device

Input Device Input Type Input Mode J2 Jumper

Position

J3 Jumper

Position

J7 Jumper

Position2

Any1None1Manual Installed Installed NA

A350P Temperature Standard Installed Removed Removed

P352PN Pressure Standard Installed Removed Removed

P35AG-9200 Pressure Standard Installed Removed Installed

Any 0-5 VDC Devices Any3Standard Installed Removed Installed

Any 0-10 VDC Devices Any3Standard Installed Removed Removed

P399 or Other Electronic

Pressure Transducer

Pressure Electronic Pressure

Transducer

Removed Removed or

Installed4Removed or Installed4

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

Position

J3 Jumper

Position

P1:

Motor Speed

P2:

Not

Used

Installed Installed Adjusts constant

speed of motor

(0-100%)

—

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.

Table 10: Standard Input Mode

Jumper

Position

Jumper

Position

P1:

Minimum

Motor

Speed

P2: Motor

Action at

Minimum

Speed

CCW:

Motor idles.

Installed Removed Can be set at

0-50% of

maximum

motor speed. CW: Motor

shuts off.

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.

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