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SmartFan The
driving force
of motor control & electronics cooling.
SmartFan
®
Stratus
SPECIFICATIONS

Input Power: 115 & 230 VAC ±10%
47-64 Hz
Single Phase Output Power ratings at 40
0
C:
1 kW load rated for three-phase
800 Watts load rated for single-phase @ 240 VAC
400 Watts load rated for single-phase @ 120 VAC

Fixed 20 kHz PWM rate 0 to 400 Hz output frequency (MODBUS control mode) Overload current protection Controls fan/motor speed based on:
4-20 mA control signal
1-10 VDC control signal
Remote temperature sensor (thermistor)
0-18 VDC transducer (powered from Stratus)
Modbus communication link
Dual control option (i.e. temperature and humidity) Fan Compatibility: For maximum motor life without using a
line filter, the use of an inverter grade motor is recommended.
FEATURES Selectable voltage-frequency curve, preset linear and fully
programmable Programmable acceleration and deceleration rates On-board Status/Fault LEDs and remote alarm signal
indicate loss of control signal, over temperature or over
current conditions Isolated control inputs Programmable temperature control mode options:
One or two remote, ORd temperature sensors
Four full speed temperature settings
Two control temperature slopes Programmable fan/motor turn off at idle Agency approvals pending Contact CRI customer service for RoHS compliance
SmartFan Stratus is an economical, yet highly versatile variable frequency drive that provides precise
variable speed control of single and three-phase fans, motors and pumps. In general, VFDs are compatible
with more motors, can control to lower speeds, have a more linear control curve and are more energy
efficient at reduced speeds than a TRIAC (voltage) based control. This microprocessor based VFD is ideal for
applications including environmental control (temperature, humidity, pressure, flow), clean room
pressurization, equipment cooling, exhaust ventilation and heating/air conditioning systems. On-board
programming allows the setting of many parameters providing maximum flexibility.
Variable Frequency Drive
Rev:
3
2007 (04) Page 1 of 8
CONTROL
RESOURCES
INCORPORATED
AC
Controls
www.controlres.com Part No.
Control Inputs
Enclosure
240F400
0-10VDC, 0-20mA, Remote Temp. Sensor, Remote Transducer, ModBus
No
240F402
ModBus only (50 piece minimum order)
No
240F400E
0-10VDC, 0-20mA, Remote Temp. Sensor, Remote Transducer, Modbus
Yes
240F402E
ModBus only (50 piece minimum order)
Yes
SmartFan
®
Stratus
CONTROL
RESOURCES
INCORPORATED
www.controlres.com
PART NUMBERING
Rev:
3
2007 (04) Page 2 of 8

CONTROL
RESOURCES

INCORPORATED

TEL: (978) 486-4160
FAX: (978) 486-4772
Email: sales@controlres.com
www.controlres.com
Page 3 of 8

2007 (04)

SETTING CONTROL MODES

Unless otherwise specified, Stratus P/Ns 240F400 and
240F400E are factory set to control fans in the
Temperature Control mode. To control via voltage,
current source or remote transducer make sure SW3
DIP switches 1-8 are set to OFF, set SW2 DIP switches
as shown below, then refer to the control mode section
you have selected to customize the Stratus for your
application.

Table 2: Setting Control Modes via Switch SW2

1 2 3 4 5 6 7 8
MODBUS
OFF OFF OFF OFF OFF OFF OFF OFF
Voltage
ON ON OFF OFF OFF OFF OFF ON
Current
ON ON ON ON OFF ON OFF ON
Temp.
ON ON OFF OFF ON OFF ON OFF
Transducer
Contact CRI Customer Service

ANALOG CONTROL MODES

USING SINGLE-PHASE OR THREE PHASE MOTORS
(switch SW1: #8)

The Stratus can control single or three-phase motors
from a single-phase power source. To control a single-
phase motor, set SW1, #8 to the OFF position, to control
a three-phase motor, set SW1, #8 to the ON position.

USING VOLTAGE OR CURRENT CONTROL MODE

Unless otherwise specified, Stratus P/Ns 240F400 and
240F400E are factory set to control fans in the
Temperature Control mode. To switch to controlling fan
speed via Voltage or Current signal, switch SW1 #7 ON
then refer to table 2 for SW2 switch settings. The
Stratus can also be customized to accept other control
schemes, contact customer service for details.

Setting Idle Speed (switch SW1: #2,3)

The idle speed is the minimum frequency (speed)
supplied to the motor. The Stratus can be set for idle
speeds of 0, 20, 40 or 60% by setting SW1 DIP switches
2 and 3. The default idle setting is 40%. Other idle
speeds can be supplied, contact customer service for
details.

Table 3: Idle Speed DIP Switch Settings
DIP switch SW1
Idle speed
2 3
0% ON OFF
20% OFF ON
40% OFF OFF
60% ON ON




Motor On / Motor Off Feature (SW1: #1)

To turn motor(s) off below the set idle speed (see figure
2), set DIP SW1, #1 to the ON position. To keep
motor(s) running below the set idle speed, set DIP SW1,
#1 to the OFF position.

Control Signal Loss Option (SW1: #6)

If the control signal is lost, (less than 4mA in the current
mode, less than 1VDC in the voltage mode) when switch
6 is OFF, the motor will automatically switch to full
speed. To keep fans idling or off when the control signal
is lost (less than 4mA in the current mode, less than
1VDC in the voltage mode) set switch 6 to the ON
position.


60%
20%
40%
SW 1:#6 OFF

SPEED vs. CONTROL SIGNAL
100%
80%
10
SW 1:#6 ON

20
mA 4
VDC 1
Figure 2


USING TEMPERATURE CONTROL MODE


The Stratus can automatically control temperature (air,
liquid or surface) by proportionately increasing or
decreasing motor/fan speed as required. One or 2
sensors can be used to sense temperature. When more
than one sensor is used, the hottest sensor will control
fan speed. To set the Stratus to the temperature control,
switch SW1 #7 OFF then refer to table 2 for SW2 switch
settings.

Control Temperature (SW1: #4,5)

The control temperature is the point above which fans
will run at full speed (T
C
). The Stratus is factory set to
control fans at 30, 35, 40 or 45C by setting DIP switch
SW1 #4 and #5. The default setting is 35C. Other
temperature setting can be supplied, contact customer
service for details.

CONTROL
RESOURCES

INCORPORATED

TEL: (978) 486-4160
FAX: (978) 486-4772
Email: sales@controlres.com
www.controlres.com
Page 4 of 8

2007 (04)


Table 4: Control Temperature DIP Switch Settings
Control Temperature (T
C
)
SW1 DIP switch
T
C
(C) T
C
(F) 4
5
30 86 OFF
ON
35 95 OFF
OFF
40 104 ON OFF
45 113 ON ON

Setting Idle Speed (SW1: #2,3)

The idle speed is the minimum frequency (speed)
supplied to the motor. The Stratus can be set for idle
speeds of 0, 20, 40 or 60% by setting SW1 DIP switches
2 and 3. The default idle setting is 40%. Other idle
speeds can be supplied, contact customer service for
details. See table 3.

Temperature Slope (SW1: #6)

The temperature slope (T
S
) is the temperature difference
between idle speed and full speed. The slope can be
set at 4C or 10C by using SW1 DIP switch #6. The
default setting is 4C. Other slopes can be supplied,
contact customer service for details. See figure 3.

Table 5: Temperature Slope DIP Switch Settings
Temp. Slope (T
S
)
SW1 DIP switch
T
S
(C) T
S
(F) 6
4 7
OFF
10 18
ON

Fan On / Fan Off Feature (SW1: #1)

To turn fans off automatically when temperatures drop
below the set idle temperature (T
C
T
S
), set DIP switch
SW1, #1 to the ON position. To keep fans running at
idle speed below the set idle temperature, set switch #1
to the OFF position. See figure 3.


C S

T -T

60%

20%

40%

MOTOR ON

SPEED vs. TEMPERATURE

100%

80%

C
T
MOTOR OFF
VAC





Figure 3

USING REMOTE POWERED TRANSDUCER MODE


The Stratus can be configured to control motor speed
based on input from many transducers, i.e.: humidity
sensor, pressure sensor, air quality sensor etc. The
Stratus can also be supplied with an on board pressure
transducer. Contact customer service for details.

MODBUS CONTROL MODE

Unless otherwise specified, Stratus P/Ns 240F402 and
240F402E can only be used in MODBUS control mode.
Using a MODBUS communications link, the Stratus can
control motor speed, acceleration, deceleration and
direction. The protocol required to use MODBUS with
the Stratus is listed below:

MODBUS RTU Protocol:

Baud Rate: 9600
Word Length: 8
Parity: None
Stop Bits: 1
MODBUS ID: 1-255

Setup for MODBUS Control

Use switch SW3 to select a unique ID number between
1 and 255 on your MODBUS network. To set an ID
number, turn ON any number of switches 1-8 on SW3
and add up their associated Value see chart below.
Example: turning ON switches 2, 5 and 7 would give a
unique ID number of 2+16+64=82.

Table 6: SW3 Switch Settings
Switch #
1 2 3 4 5 6 7 8
Value 1 2 4 8 16 32 64 128

Connecting to a MODBUS Network

Use an RS-485 2 wire twisted pair cable, connected to
the MODBUS network (see figure 5 for proper pinout).
Note: when connecting several MODBUS controllable
units in a daisy chain fashion, sever pin 7 (18VDC)
connection