SmartFan^® Cirrus Manual

Mounting and Connections

	Cirrus Programmable Interface for Speed Controllable (PWM) Fans Mounting

MOUNTING

Electrical “job box” mount (Fig 3 above)

The Cirrus can be supplied in circuit board form or with a cover, ready to mount in a standard 4x4x1.5 electrical job box. When supplied in the job box form, part number 036xJWxx , connections are made through 4.0” (10cm), 18AWG wires. Wires should be terminated using wire nuts (not included). Wires that are not used should be cut at the circuit board or individually terminated with wire nuts. See Figure 3 and Figure 5.

Circuit Board form (Fig 2 above)

When supplied in the circuit board form; 036xCxxx a spacing of ¼” (6.3mm) should be maintained between the circuit board and chassis ground and 5/16” (8mm) to any uninsulated secondary circuits to satisfy safety agency requirements. See Figure 4 below.

DIN Rail Option (Fig 1 above)

Units supplied in circuit board form; 036xCxxx may be mounted on a DIN rail using DIN rail kit CRI #DIN350.

Power Connections Connect power + to location J1, +. Connect - power to location J1, -. CAUTION: Reversing + and - may damage the control.

Fan Connections The Cirrus is designed to control and provide tach alarm signals from one or two speed controllable fans. To connect one fan, J1 or J2 may be used. For two fans, connect one to J1 and one to J2. Connect the + lead to F+, connect – lead to F-, connect PWM signal lead to C, connect the tach signal lead to A. Note: the tach lead need not be connected if the fan speed alarm feature is not to be used.

For more than two fans, use our SmartFan Cirrus-6 that can control up to six 4-wire fans.

	Cirrus Programmable Interface for Speed Controllable (PWM) Fans

Thermistor Choose an air, surface or liquid temperature sensor from the CRI catalog. Connect to J4, IN and GND (polarity neutral).

Voltage or Current signal control Connect 0 -10VDC or 0 -20mA control signal + to J4, IN and – to J4, GND. CAUTION: Reversing + and - may damage the control.

Remote Transducer The Cirrus can control fan speed based on a remote transducer. For transducers that require 18VDC or less to power, the Cirrus can power the transducer as well. To connect and power a transducer, attach the supply voltage lead to J4,OUT attach the output voltage lead to J4, IN, attach ground lead to GND. To adjust a supply voltage for the transducer, see step A) Transducer or Alarm Power.

Alarm Conditions and Connections For the off-the-shelf Cirrus, an alarm signal will be triggered if any of the conditions in table 5 are met. The Cirrus can also be preprogrammed at the factory to provide any number of custom alarm conditions and configurations.

The alarm output is a normally open (NO), open collector referenced to isolated ground. When no alarm condition is present, the relay is closed and can conduct up to 100 ma DC, of load current. When the alarm is triggered, the transistor opens, and can support up to 100 VDC across its terminals. See figures 9a, 9b, 9c or 9d for possible alarm configurations.