Functional Purpose and Operating Principles of SHAU-PV Control Cabinets

General Description

The SHAU-PV series control cabinets are specialized equipment for monitoring and regulating the operation of fans in fire-fighting ventilation systems. The devices ensure the correct operation of:

• smoke extraction fans;
• air pressurization fans.

The equipment is designed to operate with standard asynchronous electric motors and executes commands received from external control devices.

Available operating modes

The cabinet supports two fundamentally different control modes, which are selected using a switch on the front panel of the device:

1. Manual control mode
   In this mode, the operator directly controls the ventilation unit through the cabinet interface. The "Start/Stop" buttons located on the panel are used to start and stop the equipment. The system status is displayed in real time via an indicator panel, providing up-to-date information on equipment operation.

2. Automatic Control Mode
   Operation in this mode is based on processing external control signals received from the following devices:

• Fire control panel (FCP);
• Fire control panel (FCP) of any modification;
• Remote start devices (RSD).

Methods for Activating the Fan in Automatic Mode

There are two independent methodsof starting the fan in automatic mode:

• Using an external power source. To the terminal block The cabinet is supplied with a 24V DC control voltage from an external power source. A typical implementation example is the signal being supplied via the potential output of the control panel or fire control panel.
• Using a built-in power supply. 24V DC is supplied from the cabinet`s internal power source when an external dry contact is closed. This method is implemented via the potential-free output of the fire control panel/fire control panel or via the contacts of the control panel.

Motor Stop Conditions

Motor operation is stopped when one of the following events occurs:

• disappearance of control voltage at the cabinet terminal block;
• setting the operating mode switch to the "Lock" position, which physically interrupts the control circuit.

Emergency Operation Modes

If a fault occurs in the electric motor circuit—for example, if the communication line is broken or there is a short circuit—the motor automatically shuts down. At this moment, the "Alarm" control contact is activated, and the corresponding indicator lights up on the front panel of the cabinet.

If one of the phases disappears, a voltage imbalance exceeds 40%, or incorrect phasing is detected (in models of the SHAU-PV-380 type), the system reacts as follows:

• The "Alarm" contact closes;
• The "Power supply normal" contact opens;
• The corresponding indicator is displayed on the front panel of the cabinet.

Cabinets with dual power supply

Models with built-in ATS
In cabinets equipped with an automatic transfer switch (ATS), in the event of a power failure (break, In the event of a phase loss or incorrect phasing, an immediate switchover occurs from the primary input to the backup input. After the primary input parameters are restored, the system automatically returns to the original power supply circuit. Such cabinets are marked with the "B" symbol, for example:
SHAU-PV-380B-1-010-54.

Models without a built-in ATS
In control cabinets with two independent power inputs (without ATS), each pump is connected to a separate source—for example, to two different distribution panels. In this case, the cabinet`s control circuit includes its own ATS unit. For such modifications, the designation "B2" is used, for example:
SHAU-PV-380B2-2-010-54.

Cabinets with a soft start function

Frequent direct-on-line starts of an electric motor negatively impact its service life: they provoke accelerated aging of the insulating materials and overheating of the windings. As a result, the motor`s service life is reduced several times. The key factor in wear is not so much the total operating time, but the number of starts—each of which is accompanied by short-term overheating of the windings.

During direct-on-line starting, the current in the circuit reaches 6-7 times the nominal value. Using a soft starter can reduce this figure to 2-3 times the nominal value.

Advantages of a soft starter:

• Minimization of mechanical and electrical loads on the motor;
• Reduction of peak currents in the network during startup;
• Increased equipment service life.

Cabinets equipped with a soft starter are marked with the "P" symbol, for example:
SHAU-PV-380-1-010-54P.

Cabinets with variable frequency drive

In models with a frequency converter, the electric motor is controlled via a frequency controller. This ensures:

• precise maintenance of the required system performance;
• smooth engine start and stop;
• energy savings due to optimized operating modes.

Such cabinets are marked with the "Ч" symbol, for example:
ШАУ-ПВ-380-1-010-54Ч.

Fire safety compliance

ШАУ-ПВ control cabinets for fire ventilation systems are designed in compliance with technical regulations on fire safety requirements (Federal Law No. 123-FZ of July 22, 2008, GOST R 53325-2012). The following protective functions are implemented:

• Integrity monitoring of power lines connecting the cabinet to the electric motor: if a break is detected, an "Alarm" signal is activated and an indicator on the panel is turned on;
• Protection of control elements from unauthorized access.

Enclosure Color Options

Standard control cabinets for fire ventilation systems are manufactured in gray enclosures (RAL7035). A red version (RAL3000) is available upon special request. According to GOST R 53325-2012, the color scheme of fire control device enclosures is not subject to strict regulation.