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Click
on drawing to view large scale version
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| SmartFan
TachScan-3 is a digital fan speed alarm that monitors the
tach pulses from up to three DC or AC fans or blowers and provides
OR’d pass/fail signals. TachScan-3 is compatible with any fan
that provides open collector or voltage source tach pulses.
Three trigger speeds are selectable by jumper. If the speed
of any air mover falls below the trigger speed, alarm signals
are generated. Alarm signals can drive LEDs, logic, optical
isolators or MOS Relays. |
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Features
- Accepts any
supply voltage from 6 to 60 VDC and distributes power to
DC fans through the same header used to sense tach pulses.
It can also be used to power the DC tach circuits built
into AC fans.
- Three inputs
monitor fans with any open collector or voltage source tach
pulses.
- P/N 030M320
provides simultaneous NO and NC open collector outputs from
optical isolators which can sink up to 1.0 mA to drive logic
circuits.
- P/N 030M320R
provides simultaneous NO and NC isolated outputs from a
Dual-Pole MOS Relay which can sink up to 100 mA to drive
heavy loads.
- Jumper sets
trigger speed to 1,000, 2,000 or 4,000 PPM.
- Can drive two
single LEDs or one bi-colored LED.
- Compatible with
any SmartFan speed controller.
- Small size of
3.5” X 1.5” permits mounting in small spaces within fan
trays, etc.
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| SPECIFICATIONS |
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Part
Number
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Isolated
Alarm Sinking Current
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Supply
Voltage Range
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Maximum
Input Current
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Maximum
Output Current to Any Fan
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6
to 60 VDC
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2.50
Amps
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2.50
Amps
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H116
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Hardware
Pack
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| Note:
Maximum operating temperature is 65°C |
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| INSTALLATION |
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| Fan
Connections |
| For
three wire DC fans operating at supply voltages between 6.0
and 60.0 VDC, TachScan-3 distributes power to the fans in addition
to accepting tachometer pulses from the fans. Connect the fan
wires to J1, J2 and J3 using the suggested hardware, or equivalent.
For applications using less than three fans, any of the three
connectors (J1, J2, J3) can be used to monitor tachometer signals.
The fan wires are usually color coded with red for +, black
for - and white or yellow for A (alarm). Input current must
not exceed 2.5 Amps. |
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| CONNECTIONS
/ JUMPERS |
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Figure
1 Wiring Diagram
Click
on drawing to view large scale version
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| AC
Fan Alarm Monitoring |
| TachScan-3
cannot distribute AC power to AC fans. AC fans usually have
5 wires, 2 for power and 3 for the tachometer pulse circuit.
Connect the AC fan power leads to the rated source of power.
Connect the tachometer pulse leads (+, -, tach pulse) to J1,
J2, and J3. TachScan-3 distributes power to run the tachometer
pulse circuits within the fans. Apply a DC voltage at J7 as
specified by the fan manufacturer for the tachometer pulse circuits.
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| Use
with a SmartFan Speed Controller |
| Because
of the wide range of power supply voltages that may be connected
to J7, TachScan-3 may be used with any DC SmartFan speed controller.
The power output of the speed controller that would otherwise
be connected directly to the fan load is instead connected to
J7 (See figure 2). TachScan-3 in turn distributes this power
to the fans. |
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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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H115
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,
J2 J3
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22-29-2031
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Housing
Terminal (gold)
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J6,
J8
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22-29-2041
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Housing
Terminal (gold)
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J7
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22-29-2021
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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 |
