XF4

A static differential pressure transducer converts the duct pressure into a voltage signal. The differential pressure actual value is available as a voltage signal. The factory setting is such that 10 V DC always corresponds to the nominal differential pressure (Δ_{p nom}). The differential pressure setpoint value is either a constant value or it comes from a setpoint adjuster or from switch contacts. The controller compares the differential pressure setpoint value to the actual value and controls the actuator accordingly if there is a difference. Differential pressure parameters and signal voltage range are stored in the control component. Customers can easily make changes using an adjustment device or a notebook with service tool. If the supply voltage is interrupted or a wire breaks, the spring return actuator moves to the safe position OPEN (NO) or CLOSED (NC) as specified in the order code.

Compact controllers for VAV terminal units

① TVR, TZ-Silenzio, TA-Silenzio, TVZ, TVA, TVRK up to NW 250

② TVJ, TVT up to dimensions 1000 x 500, TVRK from NW 315

Differential pressure controller GUAC-PM6

* When dimensioning the transformers and the supply cable for the universal controller, the power consumption of the associated actuator must be taken into account.

** Input can be connected to supply voltage as part of override control.

Actuator with spring return 341C-024-05-V/ST06

Actuator with spring return 361C-024-20V/ST06

Range of display functions

Product details

Analogue interface 0 – 10 V or 2 – 10 V DC (operating mode V, F)

The analogue interface can be adjusted for the signal voltage range 0 – 10 V DC or 2 – 10 V DC. The assignment of the duct pressure setpoint value or actual value for voltage signals is shown in the characteristic curves.

• The set signal voltage range always applies equally for setpoint value and actual value signals.
• The signal voltage range is pre-set in the factory according to the order code entries.
• Signal voltage range can be adjusted on site in the adjustment menu on the display, via adjustment device or PC software.

Setpoint value setting

Variable operation

• In the operating mode V (variable operation), the setpoint value is specified with an analogue signal on terminal Y.
• The selected signal voltage range 0 – 10 V or 2 – 10 V DC is assigned to the pressure range P_min – P_max.
• Operating values P_min – P_max pre-set in the factory according to the order code entries.
• Subsequent adjustment of P_min or P_max can be adjusted in the adjustment menu on the display or with adjustment device or PC software.

Constant value mode

• In operating mode F (constant value mode), an analogue signal on terminal Y is not required.
• The set duct pressure constant value P_min is used.
• Operating value P_min is pre-set in the factory according to the order code entry.
• Subsequent adjustment of P_min can be adjusted in the adjustment menu on the display or with adjustment device or PC software.

 
Actual value as feedback for monitoring or tracking control

• The actual duct pressure measured by the controller can be tapped as a voltage signal at terminal U.
• The selected signal voltage range 0 – 10 V DC or 2 – 10 V DC is converted to the pressure range 0 – P_Nominal.
• Reference point P_Nominal = 600 Pa
   

Override control

For special operating situations, the duct pressure controller can be put in a special operating mode (override control). The following modes are possible: control P_min, control P_max, damper blade in the OPEN position, damper blade CLOSED.
Under certain conditions the control can also be suspended (control stop).

Override control via signal input Y

• With appropriate wiring on the signal input Y, the override controls can be activated according to the connection diagrams via wiring with external switch contacts/relays.
• OPEN and CLOSED are only available if the controller is supplied with alternating current (AC).
• In the signal voltage range 2 – 10 V, the differential pressure control can be suspended (stop) by connecting input Y to GND.
   

Override control CLOSED via control signal Y

• With signal voltage range 0 – 10 V DC: CLOSED is activated when P_min = 0 is set and the control signal is Y < 0.5 V DC.
• With signal voltage range 2 – 10 V DC: CLOSED is activated when control signal is Y < 0.8 V DC (0.8 V = factory setting).
• The specified switching point of 0.8 V corresponds here to the factory default setting.

Override controls for diagnostic purposes

• For test purposes, the override control can also be activated via the integral display, adjustment device or PC software.

Prioritisation of various setting options

• High priority: settings via the display, adjustment device or PC software
• Low priority: settings via wiring on the Y signal input of the controller

Spring return actuator

• The spring return function in case of power failure is prepared at the factory according to the order option. NC = damper CLOSED, NO = damper OPEN. On site, this function cannot be changed by parameterisation via service tools.