Service FAQs

On the following pages you will find information on the most common service questions. If the question you are looking for is not listed – then contact us by phone or leave us a message.

Most customers want to know...

For both identical and different models: How many Pro 2 Power Supplies can I run in parallel?

The number of Pro 2 Power Supplies of the same type connected in parallel is not initially limited, as long as the parallel connection is established to external rail-mount terminal blocks and through cables of the same impedance to the rail-mount terminal blocks. Parallel operation of different versions – for example 10 A and 20 A power supplies – is also possible in the “Active Droop” operating mode (factory settings).

Which Pro 2 Power Supplies comply with the ATEX directives?

A version of the 24 VDC Pro 2 Power Supply will be available with ATEX/IECEx approval. Please contact our Support department for details.

Is the Pro 2 Power Supply also available with an output voltage of 15 VDC?

No, all Pro 2 Power Supplies currently operate with a nominal output voltage of 24 VDC. Devices with nominal output voltages of 12 VDC and 48 VDC will follow. You can find the right power supplies for 15 VDC applications in our portfolio, such as: - 787-1631 Classic Power Supply with an adjustable output voltage range from 11.5 to 15 VDC - 787-1001 COMPACT Power Supply with an adjustable output voltage range from 10.5 to 18 VDC

Can I also set the trip current of the built-in electronic circuit breaker to lower values than the nominal current?

Yes, in the range of 30 % of the nominal current and above, you are free to set the trip current to any value. Furthermore, you are also free to set the tripping time of our Pro 2 Power Supplies between 100 ms and 5 s.

When does it make sense to enable the “Digital Output Remains Switched Off” function in the Pro 2 Power Supply configuration?

This function can be enabled for safety reasons in certain applications. For example, after a mains failure, it may be necessary for the power supply to not start up automatically, but rather to require manual reset. This prevents the equipment from ending up in an undefined state. In existing applications, safety relays with downstream contactors are often used for this purpose. The “Digital Output Remains Switched Off” function of the Pro 2 Power Supplies eliminates the need for such safety relays.

Can I replace individual components of Pro 2 Power Supplies on my own to extend the service life?

We cannot allow replacement of original components of Pro 2 Power Supplies. Opening the device invalidates all warranty claims. Furthermore, we would no longer be able to guarantee electrical safety or compliance with EMC limiting values.

What is the mean time between failures (MTBF) of the Pro Power Supply?

The mean time between failures (MTBF) of the Pro Power Supply is over 500,000 hours, in accordance with IEC 61709 (SN 29500) with nominal load and a surrounding air temperature of 40 °C.

Does the configuration software indicate the operating hours of the Pro 2 Power Supplies?

Not yet, but this modification is planned for an upcoming firmware update.

Are the Pro 2 Power Supplies equipped with a data logger for access to historical trend data?

The Pro 2 Power Supplies do not capture and store data over a long time period. However, if the Pro 2 Power Supply is connected to a computer, smaller measurements can be recorded. To do this, navigate to the “Measurement Recording” tab in the configuration software and click Start. The data is stored in a CSV file on your computer.

What is the DC input voltage range of the three-phase Pro 2 Power Supplies?

According to the datasheet, the three-phase Pro 2 Power Supplies, the 2787-2347 and 2787-2348, have a DC input voltage range from 480 to 780 VDC. If higher DC input voltage is needed, e.g., 800 VDC, please contact Support to discuss additional conditions for use.

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