Omni SD-DC — Speed control for DC fans S martFan Omni SD is a versatile switching DC control which operates at a highfrequency to achieve maximum power efficiency at minimum size. Units are available for nominal 12, 24 and 48 VDC operation. Omni SD controllers apply a smooth DC voltage to the air mover for absolute minimum noise. They are compatible with temperature sensors P1 through P9 shown on page 34. Control Temperature is set by means of a jumper on the circuit board. Omni SD is supplied with an optically isolated temperature alarm, triggered if sensor temperature reaches 10°C above Control Temperature or if cooling system power is lost. 2.40 (61.0) 2.00 (50.8) 0.20 (5.1) 1.10 MAX (27.9) For additional information see: page 13 Design Considerations page 34 Sensors 3.250 (82.6) 2.850 (72.4) FEATURES • Choose 12, 24, or 48 VDC nominal voltage ratings • High power efficiency: typically greater than 90% • Noise reduction: typically 15 dB(A) or more at idle speed • Constant idle voltage regardless of input voltage • Optically isolated temperature alarm output sinks up to 1.0 mA (normally closed) 0.156 D(4) (3.96) • Selectable Control Temperatures of 35°, 40°, or 45°C (74°, 80°, or 86°C when P3 sensor is used) SPECIFICATIONS Maximum Watts to Fans1 Supply Voltage Range 200 ft/Min Still Air 012D440 10-15 VDC 60 Watts/5.0 Amps 48 Watts/4.0 Amps 024D440 20-30 VDC 120 Watts/5.0 Amps 96 Watts/4.0 Amps 048D440 42-58 VDC 240 Watts/5.0 Amps 192Watts/4.0 Amps Part Number H104 Hardware Pack 1 Air Temperature of 55°C or less. See page 13 for derating above 55°C. U.S. Patents 4,659,290, 4,722,699 and 5,364,026 CONTROL RESOURCES 32 INCORPORATED E-mail: [email protected] ■ Web: www.controlres.com Omni SD-DC — Installation & Operation INSTALLATION OPERATION Mounting Fan Speed vs. Sensor Temperature To minimize EMI, mount the unit on a grounded surface using a metal spacer at the mounting hole that is surrounded by a conductive pad. The relationship between fan speed, as a percentage of full speed, and sensed temperature is shown in Figure 2. Full speed occurs at the Control Temperature (Tc ). Sensor Selection Sensors are shown on page 34. There is no polarity consideration when connecting the sensor. Fan Speed vs. Sensor Temperature 100% Figure 2 Fan speed vs sensor temperature Connections/Jumpers SENSOR 50% J2 S 1 EC J3 45 40 35 TC ºC TC - 3ºC V1 Settings R1 >= Va / 1 , kOhms Va <= 30 VDC V1 = Va, Above Trigger V1 <= 0.4, Below Trigger V1 = Va, Power Off to Unit Control Temperature (J2): Use this jumper to set Control Temperature to 35°, 40°, or 45°C. Factory setting is 40°C. If the P3 sensor is used, Control Temperature settings are 74°, 80°, and 86°C. R1 Va Temperature Alarm Output (J3) An over-temperature alarm output is provided at header J3 to drive a logic circuit. Pins J3:C and J3:E are internally connected to the collector and emitter of a phototransistor, respectively. This output is intended for connection to a logic circuit. J1 - P + + F - + F - Vs FAN(S) Alarm Type: Trigger: Alarm States: POWER SUPPLY J1 – Input Power and Fan Power J2 – Control Temperature Setting J3 – Sensor Input and Alarm Output Optically Isolated Phototransistor 10°C Above Control Temperature Conducting (Closed), Below Trigger, Cut-Off (Open), Above Trigger, Cut-Off (Open), Un-powered State 30 VDC 1 mA DC Max. Voltage: Max. Current Figure 1 Wiring Diagram Suggested Connecting Hardware H104 Hardware Pack Description Manufacturer1 Ref. Desc. Header on Board1 J1 26-48-1065 1 6 Housing Terminal (tin) Molex Molex 09-50-8061 08-50-0106 J3 22-29-2041 1 4 Housing Terminal (gold) Molex Molex 22-01-3047 08-55-0102 4 1 PCB Support Aluminum Spacer Richco Richco CBS-4-19 ALSS6-2 1 1 Screw, 6-32X 5/8 Nut, 6-32 Quantity Part Number1 1 CONTROL RESOURCES INCORPORATED or equivalent E-mail: [email protected] ■ Web: www.controlres.com 33