Normal and reverse operation - Titus - LIT-12014051 - Valve - Venturi Valve

Titus Venturi Air Valve Installation Guide

Product name
Venturi Valve
Document type
Installation Guide
Document number
LIT-12014051
Revision date
2023-04-05
The valve actuator can be set for normal or reverse operation. This ensures that fail-safe actions are achieved. The fail-safe modes include loss of power and loss of signal. The UVM has a setting, either through the UVM Configuration Tool or by an enabled DIP switch to select the normal-reverse mode of operation. Set the normal/reverse acting DIP switch, if enabled, or select the reverse operation check box in the Misc Tab of the UVM Configuration Tool to the preferred mode of operation. If the reverse setting is selected, set the actuator to reverse acting and invert the command signal from the third-party controller. This applies to revisions 0.75 and upwards The reverse operation signal from the OEM controller is 10 V to 0 V for 0 to xxxx CFM, and the actuator output control signal from the UVM is 20 mA to 4 mA for 0% to 100% positioning. The feedback signal is always 0 V to 10 V for 0 to xxxx CFM, it is never inverted. For normal operation used for supply valves and reverse operation used for exhaust and hood valves, the settings shown in the following figures are recommended for UVM revisions 0.75 onwards. Earlier revisions do not invert the UVM input signal. For normal operation settings, see Figure 24. For reverse operation settings, see Figure 25. Valve calibration label Normal operating mode Reverse operating mode.
Figure 1. Valve calibration label
Figure 2. Normal operating mode
Figure 3. Reverse operating mode