Q: The machine does not move at the set speed

First, check that the speed regulator is properly set . On the BA 651, the traction speed ranges from 0 to 5.6 km/h and depends entirely on the regulator (84). Turn this regulator counterclockwise to increase the maximum allowed speed, and clockwise to decrease it. Check the control lever (83) . For the machine to reach its set maximum speed, you must push the lever all the way forward (to move forward) or backward (to reverse). A partial push will limit the actual speed, even if the regulator allows the maximum speed of 5.6 km/h. Check the battery status . If the green indicator (81a) is not lit, the batteries are partially or completely discharged. In this case, the machine cannot reach its maximum speed. Charge the batteries to restore optimal traction power. The traction motor consumes a lot of energy, and weak batteries directly reduce performance. Check the operating conditions . The machine can climb a maximum slope of 2%. On an inclined surface, the forward speed will be slower than on flat ground. Additionally, if the recovery water tank (85 liters) is full or if you are carrying an additional load, the traction motor (200W) may not provide the maximum speed. If the traction motor is not functioning normally , consult an authorized NILFISK repair service. Check for any abnormal noise and ensure that the motor responds to commands. An electrical issue with the traction motor will require the intervention of a qualified technician.

Q: Where is the fuse for the electronic board and the RCD/RCCB protection located on the NILFISK SB TANDEM?

The NILFISK SB TANDEM is equipped with a fuse and RCD/RCCB protection at the electrical supply and electronic board level. According to the product technical documentation, these safety elements are integrated into the control unit. To precisely locate the fuse for the electronic board and the RCD/RCCB protection: Refer to the electrical maintenance section of the manual provided with the device These components are generally located in the main electrical enclosure , accessible after opening the control panel Check the position of the evaluation elements according to the specific electrical diagram of your model (available in the complete guide) If you are unable to locate these components, accessing these critical safety elements may require the intervention of a qualified NILFISK technician to avoid any electrical risk.

Question 1

The machine does not move at the set speed

Accepted Answer

First, check that the speed regulator is properly set. On the BA 651, the traction speed ranges from 0 to 5.6 km/h and depends entirely on the regulator (84). Turn this regulator counterclockwise to increase the maximum allowed speed, and clockwise to decrease it.

Check the control lever (83). For the machine to reach its set maximum speed, you must push the lever all the way forward (to move forward) or backward (to reverse). A partial push will limit the actual speed, even if the regulator allows the maximum speed of 5.6 km/h.

Check the battery status. If the green indicator (81a) is not lit, the batteries are partially or completely discharged. In this case, the machine cannot reach its maximum speed. Charge the batteries to restore optimal traction power. The traction motor consumes a lot of energy, and weak batteries directly reduce performance.

Check the operating conditions. The machine can climb a maximum slope of 2%. On an inclined surface, the forward speed will be slower than on flat ground. Additionally, if the recovery water tank (85 liters) is full or if you are carrying an additional load, the traction motor (200W) may not provide the maximum speed.

If the traction motor is not functioning normally, consult an authorized NILFISK repair service. Check for any abnormal noise and ensure that the motor responds to commands. An electrical issue with the traction motor will require the intervention of a qualified technician.

Question 2

Where is the fuse for the electronic board and the RCD/RCCB protection located on the NILFISK SB TANDEM?

Accepted Answer

The NILFISK SB TANDEM is equipped with a fuse and RCD/RCCB protection at the electrical supply and electronic board level. According to the product technical documentation, these safety elements are integrated into the control unit.

To precisely locate the fuse for the electronic board and the RCD/RCCB protection:

Refer to the electrical maintenance section of the manual provided with the device
These components are generally located in the main electrical enclosure, accessible after opening the control panel
Check the position of the evaluation elements according to the specific electrical diagram of your model (available in the complete guide)

If you are unable to locate these components, accessing these critical safety elements may require the intervention of a qualified NILFISK technician to avoid any electrical risk.

Question 3

How does the device detect the insertion of a brush or accessory?

Accepted Answer

The NILFISK SB TANDEM uses a mechanical switch detection system. When you insert the brush or accessory into the designated compartment, it activates an internal detection switch that recognizes the presence of the equipment.

This recognition mechanism generally relies on:

A mechanical switch physically activated by the insertion of the accessory
An electrical signal transmitted to the control board to validate that the accessory is correctly in place
A safety validation before the system starts

Note: The PDF of this manual does not detail the operation of the sensor precisely. If you need to know the exact location of the switch or additional technical details, check the maintenance and assembly section of the full manual or inspect the insertion compartment.

Question 4

The machine does not start despite the presence of voltage on the electronic board - what should I do?

Accepted Answer

If the NILFISK SB TANDEM does not start while voltage is present at the electronic board, the problem is likely due to a faulty or dirty component in the control system. Follow this step-by-step diagnostic procedure.

Step 1: Check the coin tester
The coin tester is the first element to check. It may be dirty or faulty and prevent the machine from starting even if the voltage is good. Clean the coin slot with a cloth soaked in white spirit, making repeated passes. If cleaning does not improve anything, the tester may be faulty and needs to be replaced.

Step 2: Manually test the suction turbine
On the SB TANDEM, the test button located on the timer circuit (visible after opening the coin tester cover) should trigger the turbine to start for a few seconds. Press this button: if the suction turbine starts, then the coin tester is the problem. If it does not start, then the turbine, the push button, or the timer is faulty.

Step 3: Check the turbine connections
Make sure all electrical connectors linking the suction turbine to the control board are properly plugged in and not corroded. Unplug and then firmly reconnect each connector.

Step 4: Inspect the control relay
The relay that controls the turbine may be stuck or faulty. If you have electrical knowledge, refer to the wiring diagram in the manual to check that this relay is receiving voltage from the coin tester.

If after these checks the machine still does not start, one of the following components is faulty and needs to be replaced: coin tester, suction turbine, control relay, or timer. In this case, contact ALTO customer service or an authorized workshop.

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