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Contacta PRO Series Installation & User Manual

Hearing loop drivers
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V22a / V34 / V34a
April 2025
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Summary of Contents for Contacta PRO Series

  • Page 1 V22a / V34 / V34a April 2025...

  • Page 2: Table Of Contents

    Notification Guide Error Messages 53-67 Technical Specification 68-70 Standards Contacta has a policy of continuous product development, therefore small specification changes may not be reflected in this manual. Images, labels, packaging, accessories and product colours are subject to change without notice.

  • Page 3: Product Overview

    V Series PRO range provides self-monitoring and email alerts, remote setup over local area networks, guided hearing loop setup to make installation simple, and excellent speech and music reproduction. Note: For large area hearing loop installation instructions, consult Contacta’s Large Area Hearing Loop Installation Guide.

  • Page 4: Components

    Components V22a NL4 Connector x2 5. V22a Hearing Loop Driver 2. Rubber Feet x4 6. Installation & User Guide 3. 3.5mm Euroblock Connector x2 7. Mounting Brackets 4. Signage 8. IEC Power Lead NL4 Connector 5. V34 Hearing Loop Driver 2.
  • Page 5 V34a NL4 Connector x2 5. V34a Hearing Loop Driver 2. Rubber Feet x4 6. Mounting Brackets 3. 3.5mm Euroblock Connector x2 7. IEC Power Lead 4. Signage Plug type varies by country. Cable & Equipment: A length of loop cable determined by the loop design is also required.

  • Page 6: Suitable Cable Lengths

    Suitable Cable Lengths The tables in this section show the approximate maximum cable lengths for differing maximum required currents. Loop impedance (at 1.6kHz) should be less than the voltage capability of the driver (V22a: 22Vrms, V34: 34Vrms, V34a: 34Vrms) divided by the required current.
  • Page 7 V22a Double-Turn Hearing Loop (Metric) Current Impedance 21.3Ω 10.7Ω 7.1Ω 5.3Ω 4.3Ω 3.6Ω 3.0Ω 2.7Ω Cable Type Cable Length Max Cable Round 568m 284m 189m 142m 114m Length Cable (AWG) 1.5mm 614m 307m 205m 154m 123m 102m 2.5mm 645m 323m 215m 161m 129m...
  • Page 8 V34 / V34a Single-Turn Hearing Loop (Metric) Current Impedance 21.30Ω 10.65Ω 7.10Ω 5.33Ω 4.26Ω 3.55Ω 3.04Ω 2.66Ω 3.57Ω 3.21Ω 2.92Ω 2.68Ω Cable Type Cable Length Round 1146.1m 573.0m 382.0m 286.5m 229.2m 191.0m 163.7m 143.3m 127.3m 114.6m 104.2m 95.5m Cable Cable Length (AWG) 1.5mm...
  • Page 9 V34 / V34a Double-Turn Hearing Loop (Metric) Current Impedance 32.1Ω 16.0Ω 10.7Ω 8.0Ω 6.4Ω 5.3Ω 4.6Ω 4.0Ω 3.6Ω 3.2Ω 2.9Ω 2.7Ω Cable Type Cable Length Round 855m 427m 285m 214m 171m 142m 122m 107m Cable Cable Length (AWG) 1.5mm 924m 462m 308m 231m 185m 154m 132m...

  • Page 10: Driver Area Coverage

    Driver Area Coverage Note: A full site survey of an installation area is recommended for optimal loop design. Perimeter Loops Perimeter loop areas detailed in the table on page 11 are valid only when the following conditions are met: Area is at the maximum current the driver is capable of delivering without voltage clipping at 1.6KHz 2.
  • Page 11 Area Voltage Current Perimeter loops 34.0V 12.0A 702.25m² 882.00m² 1200.00m² V34 Pro Phased array (no metal loss) 22.6V 8.0A 1024.00m² 1104.50m² 1160.33m² V22a Pro 34.0V 12.0A 1521.00m² 1740.50m² 1680.33m² V34a Pro Phased array (medium metal loss) 22.6V 8.0A 441.00m² 480.50m² 588.00m²...

  • Page 12: Connections

    Connections Rear Panel Connections Power Supply Input - The primary method of isolating the amplifier from the mains supply is to disconnect the mains plug. Ensure that the mains plug remains accessible at all times. Unplug the AC power cord from the AC outlet if the unit will not be used for several months or more.
  • Page 13 Unbalanced to XLR 2-CONDUCTOR SHIELDED CABLE XLR to Euroblock (balanced) 2-CONDUCTOR SHIELDED CABLE Unbalanced to Euroblock 2-CONDUCTOR SHIELDED CABLE Loop Connections Connect a twisted pair or quad core loop feeder cables to the supplied NL4 connector (see diagram below). Insert the NL4 Connector into the NL4 Loop Output Connection on the rear of the driver.

  • Page 14: Using The System

    Using the System Startup V Series PRO drivers perform a series of tests when powered on. The Contacta logo will appear and driver will therefore take between 40 to 60 seconds to become active. Fault Detected If a fault is detected, the Attention symbol will appear on the top right of the screen ( ) along with an error message.

  • Page 15: Front Panel Overview

    Front Panel Overview Display Screen - Displays menu and adjustment options. 2. Control Dial - Used to unlock the driver and make a range of system adjustments. Rotate the dial clockwise or counter-clockwise to make a selection, then press to confirm any adjustments.
  • Page 16 Signal Activity Indicators When the driver is locked, the “ABC” indicators on the bottom left of the screen display signal activity on the driver inputs. Each letter are shown in green, yellow, or red, corresponding to low, good, or high signal levels respectively. The “A”...

  • Page 17: Inputs Menu

    Inputs Selecting Inputs from the main menu opens the following screen: Input A - Adjust connections to Input A. • Input B - Adjust connections to Input B. • Audio Time Delay - Sync audio across large distances to • compensate for latency.
  • Page 18 Adjustment Level - Displays the input attenuation level (0db to • -47dB). Selecting this circle allows attenuation level adjustment. Signal Level - When optimum Adjustment Level has been achieved, • “Good” will display consistently (though peak levels may flash to “Low or “High”).

  • Page 19: Guided Loop Setup

    (see page 12). *This is dependant on correct loop design and metal loss. Required for Setup • FSM - Contacta Field Strength Meter (IL-CONTACTA-FSM) • Tripod or similar for mounting the FSM is recommended Begin the Setup Begin the Guided Loop Setup by selecting it from the driver’s main menu, and when prompted select “Yes”...
  • Page 20 “Signal On”: 3. Note the hearing loop’s field strength at 100Hz, 1KHz, and 5KHz using the Contacta Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave band pass setting. Once this is completed, select “Next” on the display to turn off the signal.
  • Page 21 5a. If the values at 100Hz and 5KHz are within +/-3db of the value measured at 1KHz, this section is complete. Select “Next”: 5b. If the driver has calculated that High Frequency Compensation is required, it will ask whether to apply this correction. Selecting “Yes”...
  • Page 22 2. The following screen will be displayed, with a symbol on the top right indicating “Signal On”: 3. Note the hearing loop’s field strength at 1KHz using the Contacta Field Strength Meter (IL-CONTACTA-FSM) set at the 3rd octave band pass setting. Once this value has been noted, select “Next”...
  • Page 23 2. The following screen will be displayed, with a symbol on the top right indicating “Signal On”: 3. Record field strength at various locations in the hearing loop using the Contacta FSM set 1KHz 3rd octave band pass setting. These details will be required in Compliance Certificate documents. Then, select “Next”.
  • Page 24 Stage 4: Completion Select “Yes” when prompted by the following screen to complete the Guided Loop Setup to save settings:...

  • Page 25: Manual Loop Setup

    Begin Manual Loop Setup by selecting the option from the driver’s main menu. Note: For large area hearing loop cable installation instructions, consult Contacta’s Large Area Hearing Loop Installation Guide or design software suites. Manual setup allows the selection of the following functions: AGC Select: Enable or disable the Automatic Gain Control.
  • Page 26 If the AGC is disabled the input gain may need to be adjusted on the Inputs setting screen. This is particularly the case if the input level is low in relation to the input gain and was previously being normalised by AGC.
  • Page 27 If the driver is being set up from a remote device, increase the current gradually by clicking at the start of the level setting arc. Phased Drivers Only: Secondary Output This screen allows the current in the secondary loop in phased drivers to be adjusted.
  • Page 28 Effects listed above will be cancelled when the TSG mode is set to “Off” or when Manual Setup mode is exited. The TSG signal will remain on while within the Manual Setup functionality unless manually switched off. This is to allow manual adjustment of HF compensation.

  • Page 29: Line Output

    Line Output This screen sets the output level of the balanced line output XLR jack on the rear of the driver. Note: Line Output Level should usually remain at 1.00 and only be reduced if advised by an educated installer. This output is not processed by the AGC to eliminate the possibility of “double AGC-ing”...

  • Page 30: Diagnostics

    Diagnostics Selecting Diagnostics from the main menu opens the following screen: Loop Selecting Loop from the Diagnostics menu opens the following screen: • Loop inductance and resistance are values measured when the driver powers on. • Hearing loop impedance at 1.6KHz (“z@1.6KHz) is calculated from the measured inductance and resistance.
  • Page 31 Driver Selecting Driver from the Diagnostics menu opens the following screen: The following data in Driver is for information only: • Output enabled (Yes/No) • Heatsink temperature • Fan speed • Supply rail voltage Counters Selecting Counters from the Diagnostics menu opens the following screen: Counters logs the number of times these events have occurred in the lifetime of the driver:...

  • Page 32: Service

    Service Selecting Service from the main menu opens the following screen: Go to Idle Screen: The driver displays an idle screen. An unlock • code will not be required to make adjustments/change settings. Go to Idle Screen + Lock: The driver displays an idle screen. An •...

  • Page 33: Save/Load Settings To Usb Flash Drive

    Save/Load Settings to USB Flash Drive Automatic Saving Settings changed in the Guided Setup or Manual Loop Setup are updated once the user completes the setup. Completing the setup will return to the main menu screen where all settings are saved locally. USB Flash Drive - Saving and Loading If a USB flash drive is connected to the driver, it will scan for a valid save file.
  • Page 34 Selecting “Menu” will return to main menu. If a valid save file already exists on the USB flash drive, the following message will be displayed instead: • Selecting “Yes” will update the settings on the USB flash drive and display a message confirming that all settings have been saved. •...

  • Page 35: System Updates

    System Updates There are 2 types of system updates: • Software updates (see page 35) • Disk image updates (see page 36) Software updates require the following 4 files to be placed in the root (top-level/default) directory of a USB connected to the driver: •...
  • Page 36 2. Select “Yes” when prompted by the following screen: 3a. If the USB’s files are valid, the driver will begin install the update before automatically restarting. The following screen will appear: 3b. If any of the USB’s files are not valid, the driver will display the following screen: 3c.

  • Page 37: Remote Setup And Adjustment

    3a. If all files are valid, the driver will begin install the update and display this screen to the user before automatically restarting. The following screen will be displayed: 3b. If the USB’s files are not valid, the following screen will display: 3c.
  • Page 38 IP addresses assigned to V PRO drivers on the network. Failure to do so will prevent the drivers from communicating with the Contacta dashboard servers. If you need assistance with opening port 80 or assigning IP addresses, please...

  • Page 39: Contacta Dashboard

    The Contacta Dashboard also allows users to track the health of their V PRO drivers over the internet. All data is logged into the Contacta Dashboard cloud system which can then be viewed on any device.

  • Page 40: Device Registration

    The mac address of the device • A 4-digit access control pin number 2. Visit the Contacta Dashboard platform setup page: https://log.contactadashboard.com/login.php 3. Log in with your mac / validation number: 4. After logging in, complete the following form. Ensure that you are using the same installer email address on all devices that you wish to manage from the same dashboard account.
  • Page 41 Ask any relevant email management companies to ensure emails from the Contacta address are whitelisted. If you have opted to send notifications to clients, pass this information on to them so that they can whitelist it.

  • Page 42: Account Registration

    Account Registration All registered drivers are managed at: https://www.contactadashboard.com/ When accessing the Contacta Dashboard a login page will appear: 2. Click the “Register here” link below the login box. 3. Fill the form using the installer email address entered in the previous device registration form (see page 40).

  • Page 43: Device Management

    Device Management The following device summary page appears on the homepage of the Contacta Dashboard: This page is divided into four sections: • The navigation menu down the left-hand side. • Four panels showing the device check in stats. •...
  • Page 44 The second icon displays all registered devices: The third icon allows fast navigation to device settings pages: The fourth icon provides detailed device history, temperature and health information: Device Check-In Stats At the top of the main page is an overview of all devices registered on the system: A device is classed as offline if it hasn’t logged information into the cloud for more than 1 hour.
  • Page 45 Recent device events Recent device events lists any recent activity of registered drivers. Registered devices The registered devices page lists all devices registered to the current installer email account. Filter devices using the filter function in the header of the table. Within the “type to filter devices…”...
  • Page 46 filter a certain site by typing something like “head office”. Data can also be matched from the driver location, driver zone and model col- umns. If the device is currently in a fault or caution error state, then the row will be highlighted in red or amber.
  • Page 47 To make changes to this section simply type the new details into the page, then scroll to the bottom of the page, and press the Update Settings button: Note: If you want to completely disable email alerts for a device you can do a combination removing all of the email tags in this screen and then setting the “Send Alerts To”...
  • Page 48 Device History The device history page shows the entire history of that device. This includes a panel at the top which shows the information that you have configured inside the device settings page: There is also a button to navigate back to the Device Settings page. Just click Edit Device to make changes to that device.
  • Page 49 The device health comprises of 3 columns. Event Date is when the device health event was logged. The type is the internal error code that was generated. This is a bit technical so next to it you will also find a Summary column which explains what the issue is and gives some more information about the parameters which triggered it.
  • Page 50 Click this button to see a detailed table of every item which has been submitted: Scroll this window down to see more entries on the table. Use the X in the top right-hand corner to close this dialogue box or simply click outside of the dialogue box.

  • Page 51: Troubleshooting

    2) Use a larger diameter cable. 3) Create a two-turn loop. 4) Use a higher voltage driver. Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.

  • Page 52: Notification Guide

    Notification Guide ATTN Signal On...

  • Page 53: Error Messages

    Error Messages Start Up V Series PRO drivers perform a series of tests on the loop (s) that are connected when powered on. If a fault is detected with the connected loop(s), the Attention symbol will appear on the top right of the screen along with an error message: “Resistance too low”...
  • Page 54 “Resistance too low” post-6.21 Firmware error messages: “Resistance too low!” error messages indicate one of two conditions: The loop resistance is below the minimum threshold of 0.5Ω 2. A short circuit exists somewhere in the connected loop. Power should be removed and reapplied to the driver once the fault has been addressed.
  • Page 55 2. Swap the loop connections between outputs. 3. If the error message now appears for the other output, the problem is with the loop, not the driver. Fault finding should be directed to this loop with the error indication. Step 2: Inspect the Loop Connection Disconnect the problematic loop connector.
  • Page 56 Alternative Driver Solution: If the loop cannot be modified to meet the 0.5Ω minimum resistance requirement, a driver specifically designed for low-resistance loops is necessary. The Contacta V15 or V15A models are alternatives for these situations. Step 4: Test with a Known Good Load...
  • Page 57 good load to the output displaying the error message. A suitable load can be constructed: • Resistance value: 1Ω to 2.2Ω • Power rating: Minimum 15 watts • Connected as shown in the below image: 2. Apply power to the driver. 3.
  • Page 58 “Resistance too high” pre-6.21 Firmware error messages: “Resistance too high” post-6.21 Firmware error messages:...
  • Page 59 “Resistance too high” error messages mean that the driver has measured the loop resistance is above the theshold for usable current. This can be caused by one of the following loop issues: A break in the loop circuit. 2. The loop is connected to earth. 3.
  • Page 60 2. Swap the loop connections between outputs. 3. If the error message now appears for the other output, the problem is with the loop, not the driver. Reset the mains power. If the error message reappears, proceed to Step 2. 4.
  • Page 61 a. The loop, including the feeder cable, surpasses the maximum allowable resistance due to excessive length, inadequate gauge size, or a combination of both. Investigate the underlying cause(s) for this. b. If the reading indicates an open circuit, it’s likely that there’s a physical break in the loop or feeder cable.
  • Page 62 2. Measure the resistance between both loops using the multi-meter. The measured resistance should exceed 10MΩ. 3. If the measured resistance falls below 10MΩ, investigate the insulation of the loop/feeder cable and inspect the points where the loops come into physical contact with each other. 4.
  • Page 63 3. If the driver successfully powers on and no error message is displayed, the loop likely has an issue requiring further investigation. Troubleshoot again. 4. If the driver displays the same error message at start up with the known good load connected, the fault is likely to be with the driver.
  • Page 64 “Loop Open” Errors and Troubleshooting During Operation A “loop open” error indicates that the driver has detected a break in the loop circuit where current cannot flow despite output from the driver. These errors: • Only occur during normal operation after successful startup. •...
  • Page 65 Step 1 : Error on One Loop If either the V22a and V34a is being used and a loop open message for just one of the connected loops is displayed: Disconnect power from the driver. 2. Swap the loop connections between outputs. 3.
  • Page 66 possibilities: a. Broken connections between feeder cable and loop. b. Physical damage or cuts along the loop length. Note: These conditions need to be rectified for the loop(s) to work again. Step 3: Test with a Known Good Load If no faults/short circuits are found with the loops and the resistance of the loop exceeds minimum requirements, the fault may lay with the loop driver.
  • Page 67 is displayed, the loop likely has an issue requiring further investigation. Troubleshoot again. 4. If the driver displays the same error message at start up with the known good load connected, the fault is likely to be with the driver. 5.

  • Page 68: Technical Specification

    Technical Specification V22a: Technical Data Line (optimised for -10dBV to 0dBv) 2 X line/microphone Audio Inputs inputs (switchable) XLR Microphone (12V phantom power via 680Ω or Euroblock optimised for levels above -45dBv) Outputs Voltage 2 x 22.66Vrms (64.09V pk-pk) 2 x 8Arms @ 1KHz (22.62A pk-pk) >1200 seconds Loop Outputs Output Current (20 minutes)
  • Page 69 Technical Specification V34: Technical Data Line (optimised for -10dBV to 0dBv) 2 X line/microphone Audio Inputs inputs (switchable) XLR Microphone (12V phantom power via 680Ω or Euroblock optimised for levels above -45dBv) Outputs Voltage 34Vrms (96.1V pk-pk) 12Arms @ 1KHz (33.94A) pk-pk >1200 seconds Loop Outputs Output Current (20 minutes)
  • Page 70 Technical Specification V34a: Technical Data Line (optimised for -10dBV to 0dBv) 2 X line/microphone Audio Inputs inputs (switchable) XLR Microphone (12V phantom power via 680Ω or Euroblock optimised for levels above -45dBv) Outputs Voltage 2 x 34Vrms (96.1V pk-pk) 2 x 12Arms @ 1KHz (33.94A) pk-pk >1200 seconds Loop Outputs Output Current (20 minutes)

  • Page 71: Standards

    (2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION: Changes or modifications not expressly approved by Contacta Systems LTD or an authorised partner could void the user’s authority to operate the equipment.
  • Page 72 Local dealer: UK & ROW US & Canada +44 (0) 1732 223900 +1 616 392 3400 sales@contacta.co.uk info@contactainc.com www.contacta.co.uk www.contactainc.com...

This manual is also suitable for:

Pro v22aPro v34Pro v34a

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