SmartFan^® Stratus II

CONTROL MODES

Stratus II Variable Frequency Drive AC Motor Speed Control

MOTOR COMPATIBILITY

For maximum motor life without using a line filter, the use of an inverter duty motor is recommended.

CONTROL MODES

Default Control Mode: Stratus II is factory set to control single phase fans from an analog voltage signal. The drive will accept a 0-5VDC or 0-10VDC input signal and control motor speed as shown in figure 1.

Fixed Speed Mode: In default control mode, Stratus II can set motors to a fixed frequency using SW2. Set switch 7 to ON and use Table 1 for frequency settings.

STOP on Contact Closure to “GND”: In default control mode, Stratus II can turn motors off when a contact closure is present at the Non-Isolated I/O terminals, GND and Z. Refer to wiring diagram. Reference level of this connection is at VBUS- and is non-isolated Hi-Voltage. Consult factory before installation.

Using Single-Phase or Three-Phase Motors:Stratus II can control single or three-phase motors from a singlephase power source.
To control a 1PH motor set SW2, #8 to the OFF position.
To control a 3PH motor set SW2, #8 to the ON position.
Power must be cycled before this setting will take effect.

Programmable Control Modes: Stratus II must be programmed using a Modbus interface. If Modbus is not available, special versions of Stratus II can be programmed at the factory with the following control modes:

• Isolated Voltage Control (0–5V / 0–10V)
• Isolated Current Control (4–20mA)
• Isolated Potentiometer Control (1K -100K )
• Isolated Temperature Control (CRI Thermistor)
• Isolated Modbus Control (J1)
• Non-Isolated Fixed Speed Switch Control (SW2)
• Non-Isolated Potentiometer Control (A/B)
• Non-Isolated Temperature Control (A/B)
• Non-Isolated Contact Closure Control (Z)

Isolated Voltage Control Signal Connections (default)
The Stratus II will accept a signal from a process sensor producing an output of 0-5VDC or 0-10VDC. Connection is made at the Isolated I/O terminals with no programming required. Scaling and alarms can be adjusted using Modbus. Refer to wiring diagram for signal and alarm connections.

Isolated Current Control Signal Connections
The Stratus II will accept a signal from a process sensor producing an output of 4-20mADC. Connection is made at the Isolated I/O terminals. Configuration using Modbus is required for processing a current signal. Refer to wiring diagram for signal and alarm connections.

Isolated Potentiometer Control Signal Connections
The Stratus II will accept a signal from a 1K to 100K potentiometer. Connection is made at the Isolated I/O terminals. Configuration using Modbus is required for processing a potentiometer signal. Refer to wiring diagram for signal and alarm connections.

Isolated Temperature Sensor Selection and Connection
The Stratus II will accept a signal from a sensor and control fan speed based on temperature. Connection is made at the Isolated I/O terminals (Refer to wiring diagram). Configuration using Modbus is required for processing a temperature signal. When sensing air temperature, use CRI sensor P10-F. For sensing temperatures of liquids or surfaces, contact CRI customer service.

Isolated Modbus Control (J1)
The Stratus II can be fully configured using Modbus RTU protocol. See Modbus section for specifications.

Non-Isolated Fixed Speed Switch Control (SW2)
The Stratus II can control speed based on a fixed setting of SW2. In default control mode, Stratus II can set motors to a fixed frequency using SW2. Set switch 7 to ON and use Table 1 for frequency settings.

Non-Isolated Potentiometer Control (A/B)
The Stratus II will accept a signal from a 1K to 100K potentiometer using a non-isolated input. Connection is made at the Non-Isolated I/O terminals. Configuration using Modbus is required for processing this type of potentiometer signal. Refer to wiring diagram for signal and alarm connections. Reference level of this connection is at VBUS- and is non-isolated Hi-Voltage. Consult factory before installation.

Non-Isolated Temperature Control (A/B)
The Stratus II will accept a signal from a sensor and control fan speed based on temperature. Connection is made at the Non-Isolated I/O terminals (Refer to wiring diagram). Configuration using Modbus is required for processing a temperature signal. When sensing air temperature, use CRI sensor P10-F. For sensing temperatures of liquids or surfaces, contact CRI customer service. Refer to wiring diagram for signal and alarm connections. Reference level of this connection is at VBUS- and is non-isolated Hi-Voltage. Consult factory before installation.

Non-Isolated Contact Closure Control (Z)
The Stratus II can process a contact closure (Digital) function as a STOP or programmable set point. See Modbus section for Setup. Reference level of this connection is at VBUS- and is non-isolated Hi-Voltage. Consult factory before installation.

Alarm
The RELAY alarm output is a normally open, optically isolated MOS Relay. When no alarm condition is present, the relay is closed and can conduct up to 100mA, of load current. When the alarm is triggered, the relay opens, and can support up to 300 Volts AC or DC across its terminals. Alarm threshold can be configured using Modbus. See Wiring Diagram for alarm configurations.