Download
Share
Print this page
  1. Manuals
  2. Brands
  3. Titus Manuals
  4. Control Unit
  5. G3 PWM BOARD
  6. Manual

Titus G3 PWM BOARD Manual

Hide thumbs

Advertisement

Quick Links

Download this manual
Fan Coil EC Motor Control
G3 PWM BOARD
The Titus "Generation 3 PWM" (G3 PWM) board provides a pulse-width modulated (PWM) signal to the EC motor to control fan speed. The
board is factory programmed to control the motor in either Three Speed (adjustable) mode or Proportional Control using a remote 2 – 10
V DC input signal. In Proportional Control mode, a 2 – 10 V DC signal will control EC motor speed between factory set minimum (Min) and
maximum (Max) values. For either control mode, fan on/off control is enabled via the 'G' signal.
Tools Needed:
• Digital multimeter capable of measuring 30 volts AC/DC and duty cycle
• Insulated 1/8" flat bladed screwdriver
• Mini Hook Test Clips for multimeter (optional)
PWM BOARD STATUS LED
The G3 PWM Status LED (refer to Figure 1) indicates the status of the G3 PWM board. See Table 1, below.
TABLE 1 - G3 STATUS LED DEFINITION
Flash
Yes
Yes
Always On
Always On
Always Off
Mode
Run
Program
Run
Program
Program Mode
Any
Indicates
Normal
Timed Out
Error
Fault

Advertisement

loading
Need help?

Need help?

Do you have a question about the G3 PWM BOARD and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Titus G3 PWM BOARD

Summary of Contents for Titus G3 PWM BOARD

  • Page 1 G3 PWM BOARD The Titus “Generation 3 PWM” (G3 PWM) board provides a pulse-width modulated (PWM) signal to the EC motor to control fan speed. The board is factory programmed to control the motor in either Three Speed (adjustable) mode or Proportional Control using a remote 2 – 10 V DC input signal.
  • Page 2 1. Make sure there are no obstructions in the discharge ductwork and/or at the plenum opening. 2. Locate the G3 PWM board in the control enclosure. Refer to Figure 1 for location of test points TP3 and TP1, the Configuration Switch, Speed Adjust Potentiometer, and Reset Button.
  • Page 3 NOTE: Changing the factory setting for minimum and maximum CFMs will invalidate the range for the Fan Calibration Curve as it will narrow the scale of the input signal. 7. Follow instructions for adjusting EC motor speed using the G3 PWM board. Separate instructions are provided for Three Speed (adjustable) and 2 – 10 VDC Proportional motor control modes.
  • Page 4 Fan Coil EC Motor Control Adjusting EC Motor Speed This section contains instructions for using the G3 PWM board to adjust the EC motor speed for balancing purposes. There are two modes of EC motor speed control: Three Speed operation at three fixed (adjust- able) speeds, or Proportional Control with remote 2 –...
  • Page 5 Fan Coil EC Motor Control • STORE: Set switch 8 to Store (ON), wait one second, then to Set (OFF), to save the value 4. Resume Normal Three Speed Operation: Set all switches to OFF to resume normal three speed operation. Refer to figure D at left. 2 –...

  • Page 6: Troubleshooting Guide

    Fan Coil EC Motor Control • Set switch 6 to ON (2-10 V) • Set switches 7 and 8 to OFF • Refer to voltmeter connected to TP1 and TP3. Using an insulated 1/8” flat bladed screwdriver, adjust speed potentiometer to desired Min speed airflow. •...
  • Page 7 Fan Coil EC Motor Control EC MOTOR TROUBLESHOOTING GUIDELINES Problem Possible Cause Corrective Action Float switch tripped Verify float switch (if present) is made. Verify motor rotates freely by hand with blower Motor fails to start Motor seized disconnected. If not, replace motor. Damaged motor cable Cable is integral to motor, replace motor Refer to Fan Calibration curve on unit.
  • Page 8 Fan Coil EC Motor Control EC MOTOR TROUBLESHOOTING GUIDELINES Problem Possible Cause Corrective Action Refer to PWM board status LEDs (page 1). Verify PWM board error or faulted all connections. Push reset button. Replace board if fault returns Verify wiring. If Fan Coil Relay board present, Improper wiring connections verify all jumpers installed.
  • Page 9 Fan Coil EC Motor Control CHECKING EC WIRE HARNESSES Use ohmmeter to verify that motor ground wire has continuity from motor case to ground. To check signal wire harnesses: Remove power from the unit. Unplug signal harness at EC driver and from motor connector at PWM board. Use ohmmeter to check continuity for each conductor, then reconnect harnesses to driver and to PWM board.
  • Page 10 Fan Coil EC Motor Control EC MOTOR AND DRIVER Depending on application, fan coil units can use three control types for EC motors (both single and dual shaft): • Constant RPM • Constant Torque • Constant Airflow Constant Airflow/Constant Torque EC Motors Constant CFM / Constant Torque EC Motor Driver Connections Note that connections marked (n/u) are not used.
  • Page 11 Fan Coil EC Motor Control Constant RPM EC Motors Big Best Manufactured Constant RPM EC Driver Connections CON 1, Power Input CON 503 (if present) Motor Enable Input CON 502 (if present) Programming Connector Description Description Description Ground No Connection +15V Neutral (or Line 2) Signal Input...
  • Page 12 Fan Coil EC Motor Control Constant RPM EC Motor Driver Enable Jumper The Constant RPM EC motor driver (Big Best manufactured) has a Motor Enable Input. These drivers require a jumper across the Enable Connector to allow the unit to operate. See Figure 10 for jumper location across pins 2 and 3 of the Enable Connector.
  • Page 13 Fan Coil EC Motor Control Constant RPM EC Motors (Broad Ocean Manufactured) Constant RPM EC Driver Connections CON 302, PWM Signal Input MTR Connection Description Description Signal COM HW (Hall Sensor) HV (Hall Sensor) HU (Hall Sensor) Ground Jumper pin 11 to pin 12 for 120 VAC Line Input only Line 1 Line 2 / Neutral...