SmartFan^® Stratus Manual

Mounting & Connections

	MOUNTING

The Stratus is supplied with six .16”D mounting holes suitable for #6 screws. Use at least 4 screws to mount the Stratus.

	CONNECTIONS

Power Connections

It is recommended that an adequately sized circuit breaker be connected between the power service and the Stratus to permit fail-safe removal of power before making adjustments or connections. Using .250” Female spade type terminals supplied, connect line power (white) to location N, connect line power (black) to location L, connect Earth ground (green) to location G. See figure 4.

Motor Connections

For motor connections, use .250” Female spade type terminals supplied. For single-phase motors, connect motor to positions marked W/T3 and V/T2. For three-phase motors connect to locations W/T3, V/T2 and U/T1. If three-phase motor runs backwards, disconnect power and switch any 2 of the three wires. Any number of motors may be controlled in parallel from one unit as long as the total current does not exceed the current rating.

To help reduce electrical noise emissions, use shielded cable or place motor wires in a grounded metal conduit. See figure 5.

D11 Output Status / Fault LED

Green	Red	Description
Flashing	OFF	Normal operation
Flashing	ON	Output over current or over temperature fault

During power up it is normal for D11 LED’s to display invalid conditions for up to 10 seconds.

If the green LED is not flashing (either on or off), the output drive circuit has failed/latched up and power should be cycled to the Stratus.

Current or Voltage Control Signal Connections

When used in the current or voltage control mode (see table 2), connect a 0-10VDC or 4-20mA control signal to A+ and COM as shown in figure 5.

Temperature Sensor Selection and Connection

The Stratus will accept signals from one or two temperature sensors and control fan speed based on the hottest sensor. When sensing air temperature, use the CRI sensor P10. For sensing temperatures of liquids or surfaces, contact CRI customer service.

Connect sensor to terminal block J2, A+ and COM or/and B+ and COM. In “Temperature mode”, if no sensors are connected or all sensors read below -20°C, fans will run at full speed and the temperature alarm will activate. The Stratus can also be supplied with a board mount sensor, contact customer service for details. See wiring diagram, figure 4.

Remote Powered Transducer Connections

When used in the remote transducer mode, the Stratus can power and control from any 0-5VDC transducer (humidity, pressure, flow etc.) with a maximum supply current of 5mA. Connect the + lead to B+, connect – to COM, connect Vout to +18V.

Refer to “USING REMOTE POWERED TRANSDUCER MODE” section to set control parameters for your transducer.

Over Temperature and Loss of Signal Alarm Connection

When used in the temperature control mode, (see table 2) an over-temperature alarm is triggered when the temperature goes 10°C (18°F) above the control temperature (TC) or below -20°C. When used in the Voltage or Current signal mode a “loss of signal” alarm is triggered when SW1 DIP switch #6 is in the ON position. To signal an alarm condition, a bicolored LED (D1) changes from green to red. An alarm signal is also passed through connections –ALM+ at J2.

The alarm output at –ALM+ is a normally open, optically isolated MOS Relay. When no alarm condition is present, the relay is closed and can conduct up to 100 mA. AC or DC, of load current. When the alarm is triggered, the relay opens, and can support up to 300 Volts AC or DC across its terminals. Other alarm trigger points can be supplied, contact customer service for details. See figure 4 alarm configurations.