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Mounting
Using the PCB support hardware in hardware pack H122-F, or
equivalent, mount the Vortex on a flat surface using all four
mounting holes for maximum support.
CONNECTIONS
Connector Pin Assignments:
A description of the function of each connector pin and location
is listed in Table 1.0. Depending on the configuration of the
Vortex, some headers may not need to be populated.
Suggested Connecting Hardware
Use CRI Hardware Pack H122-F containing the following
components shown in Table 2.0.
Input Power Connection to Header J5
Refer to Figure 1.0 for input power wiring. One power supply in
the range of 12 VDC +/- 20% should be connected at header J5.
The Vortex can supply up to 5.0 Amps (still air) at 12 VDC to
the fan load.
Fan Connection to Headers J1-J4
Four Fans:The Vortex distributes power to and monitors the
tachometer signals from four three-wire fans. Referring to
Figure 1.0, connect the fans to headers J1 through J4. Fan wires
are usually color coded with red for +, black or blue for - and
white or yellow for tachometer signal. Fan current at each fan
header must not exceed 4.0 Amps. Total current required by the
fans connected to the Vortex must not exceed 5.0 Amps (still
air) at 12 VDC.
Less than Four Fans:Through the I2C, each fan header may be
disabled. When disabled, the alarm outputs associated with that
fan header will always show no alarm.
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Figure 1: Connection diagram showing input power, fan, alarm,
and temperature sensor connections for a Vortex Fan Control.
Connection of Remote Temperature Sensor to header J7
Temperature Sensor Connection when I2C Control is used: When configured to operate with I2C based speed control,
temperature readings from both sensors are available. These
temperatures do not affect speed or alarms in this control mode.
Temperature Sensor Control using Sensors: The Vortex can
be configured to operate with either an external sensor or the onboard
sensor, which is used to provide temperature based fan
speed control and alarming. Referring to Figure 1.0, connect the
external sensor if used to header J7. There is no polarity
consideration when connecting the sensor. Temperature
accuracy and hysteresis is 2ºC.
Connection of I2C Bus to Header J7
I2C Bus Speed Command Inputs when Temperature Sensor
based Fan Control is used: When configured for temperature
sensor based fan control, header J7 will accept I2C commands.
If a speed control command is given the Vortex will
automatically switch to I2C based speed control mode.
Temperature Sensor based fan control configurations support all
I2C alarm status registers.
Internal VCC: The setting of a jumper at header J6 determines
3.3 or 5.0 VDC bus operation. The SCL (Pin C) and SDA (Pin
D) are internally pulled to VCC with 10.0KO resistors. The
total pull-up must be limited to 3mA and bus capacitance limited
to 400 pf per the I2C specification. The Speed input (Pin S) and
the ID input (Pin I) are internally pulled to VCC with 10.0KO
resistors. The Alarm output (Pin A) is a push-pull CMOS output
based on the VCC setting with a 562 Ohm limiting resistor.
GND (Pin G):Ground reference pin for the I2C Bus.
Connection of LEDs to Header J8
Header J8 provides local indication of Alarm (R) and Normal
(G) status. Referring to Figure 1.0, connect alarm LEDs to
header J8. All alarm circuits on header J8 are non-isolated
from input power (J5). Choose single color LEDs or two
leaded, bi-color LEDs with a rated forward voltage (Vf) between
1.6 and 2.4 VDC at a forward current (If) of between 15 and 25
mA. Nominal current applied to the LEDs is 8 mA.
Connection of Remote Alarm Circuits to Header J7
A signal logic level alarm output is provided on header J7 to
provide remote indication of alarm status. Referring to Figure
1.0, connect logic circuits to header J7. All alarm circuits on
header J7 are non-isolated from input power (J5).
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