VTS Ventus RHE Drive Operating Instructions

Introduction

This manual provides operating instructions for the VTS Ventus Rotary Heat Exchanger (RHE) Drive. It covers installation, connections, safety rules, and technical specifications for various configurations, including stepper motor, AC motor, and EC motor drives.

Important: Read all instructions carefully before installing, maintaining, and operating the drive. Installation work must be performed by authorized personnel in accordance with national electrical installation standards. Keep this manual for future reference.

Safety Symbols:

• ! (Exclamation Mark): Indicates issues and operations that may cause risks. Follow instructions carefully.
• WARNING: Indicates that failure to follow instructions may cause minor injury or damage to the product.
• DANGER: Indicates that failure to follow instructions may result in serious injury or death.

General Safety Rules - OSH

General Precautions:

• Ensure thorough familiarization with this manual and all applicable health and safety regulations for efficient, safe, and trouble-free operation.
• Failure to follow instructions may lead to property damage and personal injury. The manufacturer is not responsible for any damage resulting from non-compliance.
• Store the manual and related documentation in an easily accessible place for operating and service personnel.

Installation, Service, and Use Works:

• Before any work, disconnect and protect the power supply from uncontrolled startup.
• Use Personal Protective Equipment (PPE) such as anti-sharp gloves, protective helmet, and protective mask.
• All servicing should be carried out with extreme care by qualified personnel.
• Installation, commissioning, and operation must be performed by authorized persons.
• It is recommended to use a VTS-authorized service center for repairs and maintenance.
• Improperly installed, adjusted, or repaired equipment by unqualified persons can cause serious injury or death.
• This device is not intended for use by persons with limited physical, sensory, or mental abilities, or lack of experience and knowledge, unless supervised.
• Children must be supervised to ensure they do not play with the device.
• Cleaning and maintenance by the user must not be performed by children without supervision.
• Use the device according to its intended use and operating parameters. The manufacturer is not responsible for consequences of improper use.

Electrical Installations:

• All electrical work must be performed by a licensed electrician with appropriate qualifications.
• Connections must be made according to the guidelines in this document.
• DANGER: Do not open or disassemble the motor while power is connected. Wait at least 5 minutes after disconnecting the power supply before opening the motor.
• Ensure the mains voltage is within the specified permissible deviations (+/- 5% for voltage, +/- 2% for frequency).
• Check the correctness of all grounding wires.
• Install a dedicated circuit and main switch with an interlock. Set the main disconnect switch to the OFF position before servicing.
• Improper wiring or installation may cause fire or electric shock.
• The user and installer are responsible for ensuring the system is properly grounded and protected according to national and local standards.

Warnings:

• Hot Parts: Some parts may be hot. Use extreme caution, wear protective clothing, and do not begin service work until temperatures have dropped below 40°C.
• Sharp Edges: Be aware of sharp edges, such as exchanger laths. Use protective clothing.
• Moving Parts: Avoid contact with moving parts like fan impellers. Ensure parts are completely stopped before service work.
• Opening inspection panels during operation or starting the control panel with panels open is strictly prohibited. Turn off the control panel and wait for all elements to stop before opening.

Faults, Repairs, Modifications:

• If a malfunction occurs, turn off the device immediately and contact an authorized service center.
• All repairs should be carried out by the manufacturer's authorized service using original spare parts.
• Routine inspections by qualified personnel guarantee long-term, reliable operation.
• VTS authorized service stations sell replacement parts and accessories.
• Unauthorized modifications to the device will void the warranty.

Information for Users on Proper Handling of Electrical and Electronic Waste (ZSEE):

• Waste electronic and electrical equipment (ZSEE) must be collected and disposed of separately, not as municipal waste.
• Use designated waste collection systems as specified in local regulations.
• Improper disposal may adversely affect human health and the environment.
• The symbol (crossed-out dustbin) indicates that the equipment was placed on the market after August 13, 2005, and must be disposed of separately.
• Segregating and submitting used equipment for treatment, recovery, recycling, and disposal protects the environment and conserves natural resources.
• Penalties apply for illegal disposal of electrical and electronic waste.

RHE – Stepper Motor (VVS021-VVS300)

The rotary heat exchangers can be equipped with three different stepper motor configurations.

General Characteristics of Stepper Motors

Configuration of Motors in Relation to the Size of the Control Panel

Technical Specifications of Available Motor Configurations

Motor Diagrams

2 Nm Stepper Motor Diagram:

A diagram shows the dimensions and mounting points for the 2 Nm stepper motor.

4 Nm Stepper Motor Diagram:

A diagram shows the dimensions and mounting points for the 4 Nm stepper motor.

8 Nm Stepper Motor Diagram:

A diagram shows the dimensions and mounting points for the 8 Nm stepper motor.

Dedicated Controller Diagram

A diagram illustrates the dimensions of the dedicated controller unit.

Assembly and Installation

This section provides instructions on how to properly mount the motors and controller to the rotary heat exchanger housing. Pulleys are selected to match the expected speed, efficiency, and performance of the motors. Refer to the "PRODUCT DESCRIPTION AND TECHNICAL SPECIFICATION" section for correct product combinations. Pulleys must be securely fastened to the motor shaft.

DANGER: Do not change the drive configuration. Incorrect configuration can lead to incorrect operation, motor damage, and electric shock.

WARNING: Improper mechanical installation of the motor can cause error alerts.

Assembly Diagrams

2 Nm Stepper Motor Assembly Diagram:

Illustrates the assembly of the 2 Nm stepper motor, including components like the pulley, belt, motor bracket, and screw.

4 AND 8 Nm Stepper Motor Assembly Diagram:

Illustrates the assembly of the 4 and 8 Nm stepper motors, including components like the pulley, belt, motor bracket, and screw.

Connections and Cabling

This section details the stepper motor mounting and installation methods. Each stepper motor model has its own installation method.

Important Notes:

• The stepper motor must be securely attached to the housing with a dedicated bracket.
• The stepper motor must be grounded.
• Do not use cables or connectors other than those supplied with the motor and controller.
• Do not change the pulley size.
• Mount the controller properly to avoid overheating and exposure to direct sunlight.
• Check the nameplate on the motor and controller to confirm the electrical configuration.

Stepper motors are connected to and powered by a controller responsible for operating parameters. The motor has a male end connector.

Stepper Motor with Male End

Images show a stepper motor with a male end connector and the corresponding connector housing.

Connection Cable with Dedicated Terminal

Illustrates the connection cable with a dedicated terminal, showing wire assignments (Brown-U, Black-V, Blue-W, Yellow-PE) and connector details.

Extension cables are provided to connect the motor to the controller. Cable lengths vary by heat exchanger size.

WARNING: After disconnecting the mains voltage, wait at least 5 minutes before opening the controller housing. Ensure power supply is disconnected before opening.

Controller Cover

The controller cover can be detached for easier wiring access. Hinged handles allow the cover to be opened at an angle of approximately 135°.

PCB Shield

The electronic circuits are protected by a plastic cover. Removal by unqualified personnel is prohibited. Do not attempt repairs on your own, as this may void the warranty.

Spring Couplings

The controller uses spring clamps for quick installation, allowing easy cable insertion without tools. It is compatible with multicore cables. Wire ends should be 8-10 mm long. Use a screwdriver to disconnect the cable.

Stepper Motor Controller - Wiring Sockets

Diagrams and descriptions of the controller's wiring sockets:

• 1: Test button
• 2: 4-field DIP switch
• 3: LED indicator
• 4: Display (not used in basic VTS automation)
• 5: RJ12 Modbus connector (2 x RJ12)
• 6: Control and signal connections (analog/digital)
• 7: Power connectors (L, N, PE)
• 8: Stepper motor connection connectors (U, V, W, PE)

Main Power Supply and Stepper Motor Wiring

The controller's power supply voltage is 230V AC (+/- 10%). Connect the power supply cable to terminals marked "L", "N", and "PE" through dedicated cable grommets. Ensure cable glands are re-tightened and cables are not pulled or twisted.

The stepper motor is connected to the controller using a dedicated extension cable with 4-pin connectors. A locking terminal latch ensures secure installation. Do not shorten the cables.

Power Connection Diagram

Illustrates the power connection to the controller, including terminals for power supply and Modbus.

Diagram of the Controller Wiring

A detailed wiring diagram shows the connections for the motor, Modbus, analog inputs, digital inputs, and relay outputs.

Wire Requirements

Ensure selected configurations meet the following requirements:

• All cables and wires must comply with local and national regulations.
• Cable dimensions for PG9 connectors should be 3-8 mm.
• Copper wires are recommended.
• Modbus cable should be 6-wire, unshielded, 30 AWG / 0.066 mm².

Requirements for Cable and Conductor Cross Sections

Components of the Controller

Test Button

The controller has a built-in test button for activating a test function. The button's function depends on the press duration:

• Short press (< 1 sec): Enters test mode, rotating the wheel from 0 to 100 rpm. Pressing again exits test mode.
• Press and hold: Enters test mode, rotating the wheel to 100 rpm until released.

Pressing the test button for over 20 seconds may trigger the calibration function. The test button also works with Modbus control active.

DIP Switch

The controller has 4 DIP switches for setting motor size and maximum motor speed. Note: Settings are prepared by the manufacturer for optimal operation and should not be changed.

Stepper Motor Size Settings

Maximum Speed Settings

LED Indicator

The controller has an LED indicator with the following states:

• Turned off: No voltage
• Attached - green: Tension is present
• Flashing - green: Correct Modbus communication
• Attached - red: Rotor stopped due to critical alarm
• Flashing-red: Reduced power operation
• Attached - orange: Active testing function
• Flashing-orange: Active cleaning function

Modbus Control

Modbus can be connected via two RJ12 connectors (A and B, internally connected in parallel) or via spring terminals. Use telecommunications cable (6-wire, unshielded, 30 AWG / 0.066 mm²) for RJ12 connectors, or twisted-pair cable for spring terminals.

RJ12 Modbus Connectors

Diagram showing RJ12 Modbus connectors A and B.

Modbus Spring Connectors

Diagram showing the pin assignments for Modbus spring connectors (GND, 0-10V, A, B, etc.).

After 10 seconds without a valid Modbus request, the controller attempts to detect Modbus with alternative parameters.

Default parameter values for controller communication are unchanged, except for alternative parameters.

Features Available

Available Coil Status

Available Input Status

Available Input Registers

Available Holding Registers

Adapting the New RHE OI (SPR) Controller to Work with AHU VTS

To adapt a new RHE controller (ordered as a spare part) to work with VTS air-handling unit automation:

• Connect to the RHE controller using a USB-RS485 converter and PC software (e.g., Modbus Poll). Default parameters: address 79, baudrate 38400, no parity checking, 2 stop bits.
• Set Holding Registers 13-16 according to target parameters: address 4, baudrate 9600, no parity check, 1 stop bit.

Settings are accessed without a password and do not require saving.

To enable uPC3 - RHE OI interaction, select "OI" as the RHE motor type on the uPC3 controller's 103 configuration screen.

Drive Unit with AC Motor

The drive unit starts and smoothly controls the exchanger speed from 3 to 10 revolutions per minute (up to 20 rpm for enthalpy exchangers). The drive system includes:

• Rotor drive belt transmission
• Gearmotor
• Frequency converter

Working Parameters:

• TN system
• Rated supply voltage: 200-230V ±10%
• Rated frequency: 50-60 Hz ±5%
• Degree of protection: IP54
• Permissible operating temperature: -30°C to +50°C
• EMC environment: 1

Basic Data of the Power Unit

Diagram of the Electrical Circuits of the Exchanger Drive Unit

Illustrates the electrical connections for the drive unit, including power supply and motor connections.

Drive Configuration

Input Signal Terminal (Input Terminals)

Diagrams and descriptions for multifunction input terminals and analog input configuration.

• Multifunction input terminals (P1-P5): Configurable terminals for various functions like emergency stop, error reset, and step operation.
• Analog input configuration (CM, VR, V1): Terminals for setting frequency reference via analog voltage or current input.

Control board switches: SW1, SW2, SW3 for mode selection and terminal resistor selection.

Connectors: For remote keypad, smart copier, or RS485 communication.

Drive Unit with EC Motor

Installation and Configuration of Drive Unit with EC Controller

Controls manufactured by VTS are designed for direct connection of the exchanger drive unit.

If an HMI Advanced user interface is connected, parameters can be configured automatically using the EC Controller Programming option.

Refer to the control unit electrical diagram for power supply connection and the automation application diagram for communication line connection.

Modbus RTU/RS485 Parameters for EC Controller

CEWKA Parameters

Discrete Status Bits (Input)

Access Level:

• 0 - read only
• 1 - basic settings / password: 1
• 2 - service setting

Register and Entry Register Information

Tables detailing Register and Entry Register information, including address, function, scope, value, description, and level.

Speed Control from Modbus Level

To switch control signal from 0-10Vdc to ModBus RTU:

• Set "Operation Mode" parameter to 2.
• Set "Set Point" parameter to the desired value as a percentage of maximum speed.

Example:

Set_Point < 1000 (10.00 %) ... Motor stopped

Set_Point = 1000 (10.00 %) ... Motor runs at minimum speed

1000 (10.00%) < Set_Point <= 10000 (100.00 %) ... The motor runs at the desired speed.

Motor speed is converted according to the formula:

Speed[RPM] = RPM_Min + (RPM_Max - RPM_Min) / 9000 * Set_Point[%]

Cable Specifications

Details on cable sizes, purpose, description, parameters, and explanatory drawings:

• 3x1.5mm² power cord: Multicore cables with copper conductors in PVC insulation. Voltage Rating: 450/750V. Operating temperature: -40°C to +70°C.
• 1x1mm² or 2x1mm² control circuits: Control cables with copper conductors, shielded with copper wires in insulation PVC. Voltage Rating: 300/500 V. Operating temperature: -40°C to +70°C.
• UTP or STP twisted pair cable: Multi-conductor copper wires in PVC or PE insulation. Operating temperature: -20°C to +60°C.

Conductor cross-sections are selected for long-term current carrying capacity. Verify power supply cable cross-sections based on protection selectivity, cable length, routing, and short-circuit currents.