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Click
on drawing to view large scale version
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| SmartFan
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°C above the Control Temperature.
Omni L1A is compatible with sensors P1 through P9 shown on Sensors
page. |
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Features
- 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
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| SPECIFICATIONS |
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Part
Number
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Type
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Supply
Voltage Range
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Maximum
Watts to Fans (3)
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Control Temperature
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Full
Speed / Idle Speed Temperatures
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200
ft/min
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Still
Air
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Air
Sensor
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P3
Surface Sensor
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Closed-Loop
(1)
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11.5
– 30 VDC
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38
Watts
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20
Watts
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N/A
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018L135PA
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Open-Loop
(2)
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11.5
– 30 VDC
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38
Watts
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20
Watts
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N/A
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N/A
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35°C/23°C
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H104
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Hardware
Pack
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|
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| (1)
For sensor installed near equipment exhaust. ;(2) For sensor
installed at equipment air inlet.; (3) Air Temperature of 70°C
or less. ; U.S. Patents 4,659,920, 4,722,699 and 5,364,026 |
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| INSTALLATION |
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| Sensor
Selection |
| There
is no polarity consideration when connecting the sensor. To
view Sensors page click here: Sensors |
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| CONNECTIONS |
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Figure
1
Wiring Diagram Click on drawing
to view large scale version |
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| OPERATION |
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| Fan
Speed vs. Sensor Temperature |
| 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 ). Minimum speed temperature
(approx. 50% of full speed) depends on part number. For closed
loop units, the “X” in Figure 2 is equal to 3. For open loop
units the “X” in Figure 2 is equal to 12 |
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Figure
2
Fan speed vs. control signal
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| Temperature
Alarm Output (J2) |
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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 transistor’s
collector, respectively. When the alarm is closed, Pin C is
at circuit ground (P-).
| Alarm
Type: |
Non-Isolated
Open-Collector |
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| Trigger:
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10°C
Above Control Temperature |
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| Alarm
States: |
Cut-Off
(Open), Below Trigger |
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Conducting
(Closed), Above Trigger, |
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Cut-Off
(Open), Un-powered state |
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| Max.
Voltage: |
30
VDC |
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| Max.
Current: |
20
mA |
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| Suggested
Connecting Hardware |
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Ref.
Desc.
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Header
on Board (1)
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H104
Hardware Pack
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Quantity
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Description
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Manufacturer
(1)
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Part
Number (1)
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J1
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26-60-4040
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Housing
Terminal (tin)
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J2
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22-29-2041
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Housing
Terminal (gold)
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4
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PCB Support
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Richco
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CBS-4-19
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| (1)
or equivalent |
