full speed/ idle speed maximum watts to fans 3 30 control resources incorporated e-mail: sales@controlres.com n web: www.controlres.com wide supply voltage range (11.5 to 30 vdc) noise reduction 15 db(a) or more at idle speed supplied with temperature alarm from transistor open collector. will sink at least 20 ma above alarm trigger temperature 70 c maximum operating temperature omni l1a-dc ?speed control for dc fans features 1.31 (33.4) 0.88 (22.4) 0.19 (4.8) 1.69 (42.9) 2.38 (60.4) 2.75 (69.9) 0.156 d(4) (3.96) s martfan omni l1a is a medium power dc control designed to be used with 12 or 24 vdc fans with power ratings up to 38 watts. it operates in a linear mode applying a smooth dc voltage to the fans for minimum noise. omni l1a is available for both closed- loop (temperature regulating) and open-loop (temperature compensating) applications. it includes a temperature alarm, triggered if the sensor temperature reaches 10? above the control temperature. omni l1a is compatible with sensors p1 through p9 shown on page 34. specifications 018l135a 018l140a 018L135PA 11.5-30 vdc 38 watts 20 watts 35? 40 74? 80 38 20 n/a n/a 35 c/23 c 11.5-30 control temperature supply voltage range 200 ft/min still air air sensor p3 surface sensor temperatures part no. type h104 hardware pack na closed-loop 1 open-loop 2 1 for sensor installed near equipment exhaust. 2 for sensor installed at equipment air inlet. 3 air temperature of 70? or less. see page 13 for derating above 70?. u.s. patents 4,659,290, 4,722,699 and 5,364,026 for additional information see: page 13 design considerations page 34 sensors
31 control resources incorporated e-mail: sales@controlres.com n web: www.controlres.com omni l1a-dc ? installation & operation installation sensor selection sensors shown are on page 34. there is no polarity consideration when connecting the sensor. same ref. as vs. va r2 alm 2 f- f+ vs j1 p+ p- power supply fan(s) c + s+ r1 sensor alm 1 j2 led r1 >= (vs-2) / 20 , kohms below trigger: led is off above trigger: led is on power off to unit: led is off led r2 >= (va-2) / 20 , kohms below trigger: led is off above trigger: led is on power off to unit: led is off operation fan speed vs. sensor temperature the relationship between fan speed, as a per- centage of full speed, and sensed temperature is shown in figure 2. full speed occurs at the control temperature (t c ). minimum speed tem- perature (approx. 50% of full speed) depends on part number. for closed loop units, the ?? in figure 2 is equal to 3. for open loop units the ??in figure 2 is equal to 12. temperature alarm output (j2) an over-temperature alarm output is provided at header j2. this open collector output is designed to drive an led. pins j2:+ and j2:c are internally connected to the power supply (p+) and a transis- tor s collector, respectively. when the alarm is closed, pin c is at circuit ground (p-). alarm type: non-isolated open-collector trigger: 10? above control temperature alarm states: cut-off (open), below trigger conducting (closed), above trigger, cut-off (open), un-powered state max. voltage: 30 vdc max. current 20 ma dc figure 1 shows two alarm configurations that allow the led alarm output to be internally powered by the board supply voltage or by a current limited external supply. suggested connecting hardware ref. desc. header on board 1 quantity description manufacturer 1 part number 1 j1 26-60-4040 j2 22-29-2041 1 4 1 4 4 h104 hardware pack housing terminal (tin) housing terminal (gold) pcb support molex molex molex molex richco 09-50-8041 08-50-0106 22-01-3047 08-55-0102 cbs-4-19 1 or equivalent connections t ? c c t 50% 100% fan speed vs. sensor temperature - x? figure 2 fan speed vs control signal j1 ?input power and fan power j2 ? sensor input and alarm output figure 1 wiring diagram
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