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Mounting
Using the PCB support hardware in hardware pack H117-F, or
equivalent, mount the Multi-SR on a flat surface using all six
mounting holes for maximum support. To minimize EMI,
securely mount the unit on a grounded surface using a metal
spacer and hardware at the mounting hole that is surrounded by a
conductive pad.
Multi-SR Part Numbering Scheme:Referring to the part
number scheme shown below, select the Multi-SR that meets
your application:
Example: 052S4402T15-F = A Multi-SR rated 36 to 75 VDC
@ 4 Amps, 40°C MED control temperature setting, temperature
sensor based control from two remote temperature sensors, an
on-board isolated supply and capability to monitor the speed of
five fans.
The default configuration of the Multi-SR that is stocked is
052S4401T16-F.
CONNECTIONS
Connector Pin Assignments:
A description of the function of each connector pin and location
is listed in Table 2.0. Depending on the model number and
configuration of the Multi-SR, some headers may not need to be
populated.
Suggested Connecting Hardware
Use CRI Hardware Pack H117-F containing the following
components shown in Table 3.0.
Input Power Connection to Header J13
Refer to Figure 1.0 for input power wiring. One or two power
supplies in the range of 36 to 75 VDC should be connected at
header J13. If two power supplies are used, they are logically
OR’d on the Multi-SR so that the operating voltage is equal to
the higher of the two supplies. The Multi-SR can supply up to
4.0 Amps (still air) and 5.0 Amps (200 LFPM air stream) at 24
VDC or 48 VDC to the fan load.
External Filter Capacitor Connection to Header J2
Although it is not required in most applications, an external
capacitor (C1) can be installed to provide additional EMI/EMC
filtering. Connector J2 is internally connected across the output
of the voltage regulator circuitry and in parallel with 960uF of
internal filter capacitance. Referring to Figure 1.0, connect an
appropriately sized capacitor to header J2.
Fan Connection to Headers J3-J8
Six Fans: The Multi-SR distributes power to and monitors the
tachometer signals from six three-wire fans. Referring to Figure
1.0, connect the fans to headers J3 through J8. 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 2.5 Amps. Total current required by the fans
connected to the Multi SR must not exceed 4.0 Amps (still air)
and 5.0 Amps (200 LFPM air stream) at 24 VDC or 48 VDC.
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Less than Six Fans: When configured to operate with less than
six fans, the Multi-SR is designed to locate the fan headers that
have fans connected to them. This means that the position of
each fan connection is arbitrary. For instance, when configured
for three-fan operation, the three fans can be connected to any
three headers, J3-J8.
CAUTION: If less or more than the configured amount of fans
are connected, a FAN alarm will be activated.
Connection of Remote Temperature Sensor(s) to header J17
Temperature Sensor Connection when I2C or PWM Based
Control is used: When configured to operate with either PWM
or I2C based speed control, this header is disabled. Therefore,
no temperature sensors should be connected to the Multi-SR.
Remote Temperature Sensor Control using 3 Sensors: The Multi SR can be configured to operate with a maximum of three
remote temperature sensors that are used to provide temperature
based fan speed control and alarming. Referring to Figure 1.0,
connect the three sensors to header J17. There is no polarity
consideration when connecting the sensors. The sensor reading
the highest temperature is used for speed control and alarming.
Remote Temperature Sensor Control using < 3 Sensors: When configured to operate with less than three remote
temperature sensors, the Multi-SR locates the positions that are
occupied by the sensor(s), T1, T2 and/or T3. This permits the
user to place the one or two sensor(s) at any position. When two
sensors are used, the thermistor reading the highest temperature
is used for fan control and alarming.
CAUTION: If less or more than the configured amount of
sensors are connected, a TMP alarm will be activated.
On Board Temperature Sensor Control: When configured to
operate with an on-board temperature sensor, header J17 is
disabled. Speed control is based on the sensor soldered to the
Multi-SR.
Connection of PWM / 0-5VDC Control Signal to header J16
0-5 VDC or PWM Control Signal: The Multi SR can
proportionally control fan speed based on a PWM or 0-5 VDC
control signal. Chart 2.0 shows the relationship between the fan
voltage and the control signal input. Referring to figure 3.0,
connect the voltage signal to header J16. Header J16 is
internally pulled up to VCC with a 47.5k resistor. The voltage
applied to J16 must be limited to the isolated VCC. The PWM
frequency range is 0.1 to 10 kHz.
Control Signal Power: If the Multi SR was ordered with the
Isolated Power option (see table 1.0), the Multi SR will power
this interface. Otherwise, the isolated power must be provided at
the VCC & GND pins at header J14 (see figure 3.0).
Under Temperature Sensor or I2C based Fan Control: When
configured for temperature sensor or I2C based fan control,
header J16 is disabled.
Connection of I2C Bus to Header J14
I2C Bus Speed Command Inputs when Temperature Sensor
or PWM/0-5 VDC based Fan Control is used: When
configured for temperature sensor or PWM/0-5 VDC based fan
control, header J14 will accept I2C Bus speed control inputs but
they are ignored by the control circuitry. Temperature Sensor
and PWM/0-5 VDC based fan control configurations ONLY
support I2C alarm status communication.
Fan Control and/or Alarm Status Communication on the
I2C Bus: The Multi-SR can monitor alarm status and control the
fan voltage via an I2C Bus. Referring to Figure 3.0, connect
serial clock, data, VCC and ground lines to header J14.
VCC: For units that feature an internally isolated 3.3/5.0 VDC
supply, no connection to J14:VCC is required; all power for the
I2C bus is provided by the Multi-SR. When power for the I2C
bus is provided by the Multi-SR, the setting of a jumper at J18
determines 3.3 or 5.0 VDC bus operation. For units that use an
external bus power source, connect a 3.3 or 5.0 VDC source to
J14:VCC. Header J18 is disabled when external bus power is
provided.
GND: Two ground reference pins are provided for the I2C bus.
Note that the additional ground pin has been provided for the
optional connection of a loop back detection circuit. The loop
back circuit permits detection of a physically broken connection.
Connection of LEDs to Header J9
Header J9 provides local indication of fan (FAN), temperature
sensor (TMP) and watchdog (WD) alarm status. Referring to
Figure 3.0, connect alarm LEDs and/or an audible alarm to
header J9. All alarm circuits on header J9 are non-isolated
from input power (J13). 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.
The audible alarm output (+AUD-) provides up to 20 mA at 5
VDC and is fused with a 0.062 Amp fuse. Choose an audible
alarm rated 100 mW at 5 VDC.
Connection of Remote Alarm Circuits to Header J12
Two optically isolated logic circuit outputs are on header J12 to
provide remote indication of alarm status. Referring to Figure
3.0, connect logic circuits to header J12. Both alarm outputs
must be current limited as shown in Figure 3.0. The output of CE,
considered a major alarm indicator, is from an open collector
phototransistor. The output of 1-2, considered a minor alarm
indicator, is from a MOS relay.
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