VSM-CP2 VARIABLE SPEED MOTOR CONTROLLER
Analog Setpoint and Differential Pressure Sensor

	CP2 Product Brochure – Form 15-1003 Downloadable PDF
	CP2 Wiring Diagram – Form 1005 Rev B Downloadable PDF
	CP2 Pressure Sensor Information – Form 15-1007 Rev A Downloadable PDF

APPLICATION

The Varidigm Variable Speed Motor Controller responds to two different inputs.  An analog input provides a pressure setpoint signal while a pressure sensor provides pressure feedback to the controller.  The controller responds by controlling a pressure by varying the speed of a Permanent Split Capacitor (PSC) motor in response to an analog (0–10 Volt DC or  4 – 20 maDC) signal from the building automation system or other source (i.e. remote pot, on-board pot, or infrared remote signal).

This controller is designed for use with basically standard Definite Purpose, Permanent Split Capacitor (PSC) Frame 42, Frame 48, and 3.3 inch diameter motors ranging from 1/20 to 3/4 HP.  Controllers are available for 120V, 240V, and 277V, 60 Hz motors.

This Varidigm controller provides a wider speed range than traditional multi-tap motors.

FEATURES

• Controls a pressure (or vacuum) in response to both an analog input and a sensed pressure signal.
• Suitable for use with either pressure or vacuum.
• Senses differential pressures.
• Cuts building operating cost through reduced power usage.
• Provides continuously variable motor speed  in response to a pressure setpoint from a 0 -10 VDC or 4 – 20 maDC input, potentiometer setting, or infrared remote.
• Interfaces with typical building controls.Incorporates soft start and soft transition between speeds, reducing objectionable device noise.
• Improves comfort by providing continuous air circulation at off-peak use times.
• Lower first cost when compared with inverter type controllers.
• For use with most standard PSC AC induction motors.
• UL/CUL component recognized.
• FCC Part 15 B Compliant.

SPECIFICATIONS

NOTE: Most standard PSC motors can be used with this controller by making minor external changes to the motor hookup. Refer to Varidigm Form 1006 for details.

SPEED RANGE:

3:1 turndown is typical and can vary with the application. Contact Varidigm for details.

PRESSURE SETPOINT RANGE:

0.1 to 1.0 inch water column
0.1 to 1.5 inch water column
0.1 to 2.0 inch water column

SETTING RESOLUTION:

0.1 VDC (0.1 mADC) minimum

POWER SUPPLY:

120V, 60 Hz, 1 phase (102 to 132 VAC),
240V, 60 Hz, 1 phase (204 to 264 VAC),
277V, 60 Hz, 1 phase (235 to 305 VAC)
Controller and motor must have same power supply rating.

AMBIENT TEMPERATURE RATING:

-40 C to 70 C (-40oF to 160oF)

PRESSURE SETPOINT INPUTS:

MOTOR LOAD CURRENT:

Still air environment:

Locked Rotor

Higher ambients are permissible in moving air. Contact Varidigm for assistance.

UL/CUL COMPONENT RECOGNIZED:

UL 508, File No. E221364
UL 1917, File No. E234506

FCC Compliant:

FCC Part 15B

ENCLOSURE REQUIRED:

800 in3, (10 in. x 10 in. x 8 in.), or larger metal enclosure is required to meet temperature rise requirements.  The enclosure should meet appropriate NEMA enclosure requirements.

INSTALLATION

LOCATION

Choose a location where the ambient
temperature will not exceed the temperature
rating of the controller and where it is protected
from moisture and combustion condensate.

MOUNTING

The controller is furnished with 4 plastic
mounting stand-offs. These are designed to
snap into four (4) 3/16 in. diameter holes in the
mounting surface. The mounting plate can be
up to .063 in. thick.

Figure 1 - Mounting Dimensions (Inches)

WIRING

Disconnect/Breaker Protection

External overcurrent and disconnect means must be provided in accordance with the NEC and local codes. A 20 amp time-delay fuse or breaker protecting the motor/controller is recommended.

Figure 1 – Mounting Dimensions (Inches)

CONNECTIONS

The motor is connected to ¼ in. male quick connect terminals on the control as follows:

Figure 2 – Wiring Terminal Locations and Jumper Locations

SETTING AND CHECKOUT

1. Set jumper for control input: 0 –10 VDC, 4 –20 maDC, remote 20K potentiometer.
2. Energize motor and controller by turning on power source.
3. Adjust system control so that it provides a setpoint signal of either: 0-10 VDC or 4-20 mADC at terminals T3 and T4; or a 20K potentiometer across terminals T2 and T4 with wiper connected to T3.
4. Motor must start and increase speed proportionally to the input signal.
5. Adjust setting up or down to verify that motor/control responds to changing control signal (i.e. if voltage or current input increases, then speed should increase).

Figure 3 – Wiring Connections for VSM-CP2 With Standard PSC Motor

Figure 4 – Wiring Connections for VSM-CP2 With Typical Varidigm Motor

SETTING AND CHECKOUT

1. Set jumper for control input:  0 –10 VDC,   4 –20 maDC, remote 20K potentiometer, local potentiometer, or infrared remote (See Fig. 2).
2. Energize motor and controller by turning on power source.
3. Adjust system control so that it provides a pressure setpoint signal of either: 0-10 VDC or 4-20 mADC at terminals T2 and T3; or a 20K potentiometer across terminals T1and T3 with wiper connected to T2.
4. Motor must start and increase speed proportionally to the input signal.
5. Adjust setting up or down to verify that motor/control responds to changing control  signal (i.e. if voltage or current input increases, then speed and pressure should increase).

Figure 5 – Pressure Connections
Always connect the highest pressure to the “+” end of the pressure sensor.  Use flexible 1/8 inch internal diameter plastic tubing that fits snuggly on the sensor connections.  Be careful when installing or removing the tubing from the sensor so as not to damage the sensor.

Figure 6 – Connections for Infrared Receiver

Figure 7 – Connections for Remote Potentiometer.

APPLICATION

The VSM-CP2 controller is intended for use in air-moving applications, but other applications may exist.  The controller’s ability to provide consistent output based on pressure feedback makes it suitable for application in fan powered VAV terminal boxes, fan filter units, fan coil units, ventilators, etc.

The on-board differential pressure sensor may be piped to sense inlet fan pressure, pressure downstream of the device, or pressure in a controlled space.  Refer to Form 15-1007 for details on the Sensor Probe Assembly, identity number 1049A.

The VSM-CP2 is designed to enhance the controllability of standard PSC motors.  Most PSC motors are compatible with the CP2.  Refer to Varidigm Form 1005 for simple compatibility testing procedures.

ORDERING INFORMATION

The VSM-CP2 can be used with most standard PSC motors. Refer to Varidigm Form 1006 for details on how to determine if your standard PSC motor is compatible with the Varidigm Controller. Order motor separately.

ORDER FROM

Varidigm Corporation
3070 Ranchview Lane
Plymouth, MN 55447 USA
Tel: (763) 258-0170 Fax: (763) 258-0411
E-mail: sales@varidigm.com
www.varidigm.com

FORM 15-1008 Rev. B ©2004, Varidigm Corporation, all rights reserved. Subject to change without notice. Varidigm components are covered by US and international patents.