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Power-In Connection (J11)
Refer to Figure 1 for supply power wiring. Connect
supply power at header J11. Header J11 is rated at 4.0
Amps per pin. For applications requiring less than 4.0
Amps, a single pair of power and return wires should be
connected to a single pair of + and – pins, respectively.
For applications requiring between 4.0 and 8.0 Amps,
connect two pairs of supply power and return leads to
both pairs of + and – pins on J11 to handle the higher
current.
Fan Connections
For three wire DC fans, TachScan-9 distributes power to
the fans in addition to accepting tachometer pulses from
the fans. Connect the fan wires to headers J1 through
J9. Fan wires are usually color coded with red for +,
black for - and white or yellow for A (alarm). Fan current
at each header must not exceed 4.0 Amps. Total fan
current through J11 must not exceed 8.0 Amps.
AC Fan Alarm Monitoring (P/N 030M92010-F)
TachScan-9 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 through
J9. TachScan-9 distributes power to run the tachometer
pulse circuits within the fans. Apply a DC voltage as
specified by the fan manufacturer for the tachometer
pulse circuits at J11.
When Fewer Than 9 Fans Are Installed
If tachometer pulses are not connected to all of the A
inputs at headers J1 through J9, TachScan-9 will
indicate a fan failure. The 5-position switch at SW1
allows fan headers from J5 through J9 to be disabled.
See Table 1 for switch settings. Standard TachScan-9
boards are shipped with the switches in the OFF position.
Table 1: SW1 Settings
| To Disable Fan Header |
Turn On Switch |
| 9 |
1 |
| 8 | 2 |
| 7 | 3 |
| 6 | 4 |
| 5 | 5 |
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Connections / Jumpers / Switch
Figure 1: Wiring diagram
J1 - J9 Fan Power and Tach Input
J10 - Trigger Speed Setting
J11 - Supply Power
J12 - Isolated Alarm Outputs
J13 - Non-isolated Alarm Outputs
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Above Trigger Speed
Sense_VA <= 0.4 VDC
Sense_VB = V1 VDC
Sense_VC <= 0.4 VDC
Below Trigger Speed
Sense_VA = > 2.0 VDC
Sense_VB <= 0.4 VDC
Sense VC = V2 VDC
G = Green LED
R = Red LED
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Using TachScan-9 with a SmartFan Speed Controller
Because of the wide range of power supply voltages that
may be connected to J11, TachScan-9 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 J11 (see
Figure 2). TachScan-9 in turn distributes this power to
the fans.
Figure 2: Multi-board configurations for variable fan speed control and tachometer alarm monitoring.
Hi-Pot Testing
When installed using ¼” spacers, all versions of the
Tachscan 9 are design to withstand a maximum voltage
of 3000VDC or 3000RMS during Hi-Pot testing. |
