Application note The DC bus is available on the power connector of any INFRANOR® drive to allow paralleling or external capacitor box connection. The paralleling of drive DC busses or adding of an external capacitor box has many advantages: - it reduces ripples of the DC bus voltage that can decrease performance in dynamic applications, - it increases the DC bus capacitors' lifetime, - it reduces heat dissipation into the braking resistor by storing more energy during deceleration phases, - it reduces electricity consumption by storing more energy during deceleration phases. All Infranor drives are designed to assume a lifetime of at least 20.000 hours at 40°C without any derating when supplied by three-phase mains. In single-phase applications, the continuous power must be limited according to the table below: In applications with higher power and with 230V single phase mains, an external capacitor box (ref. CAPABOX 230) must be added or the DC busses must be paralleled.

3 – DC BUS PARALLELING XtrapulsCD1™, XtrapulsEasy™, XtrapulsPac™ and XtrapulsPacHP™ drives have the same topology. So, these ranges can be mixed when paralleling DC busses. However, paralleling DC busses requires some precautions for the installation, in order to remain efficient and safe: - all drives need to be powered by the mains; - the same phases must be used on all drives. Especially in single-phase configuration, if drive axis 1 is powered by L1 and L2, the other drives must be powered by L1 and L2 as well; - all drives must be powered at the same time. It is highly advised to use the...

4 – ADDING AN EXTERNAL CAPACITOR BOX (CAPABOX) Direct connection of external capacitors between DC+ and DC- lines is forbidden because the drive soft start system is by-passed. In this case, an important inrush current at the power up can damage the drive. The available solution consists in an external capacitor box including a soft start system. This accessory is fully compatible with XtrapulsCD1™, XtrapulsGem™, XtrapulsPac™ and XtrapulsPacHP™ servo drives. 4.1 – ORDERING CODE CAPABOX - xxx Application voltage: 230 or 400 VAC 4.2 – ELECTRICAL SPECIFICATIONS Main features: Rated voltage Capacitive...

Let us have a look at the following single-phase application: This time, by paralleling the DC bus, the total required power (3700W) is higher than the total continuous power allowed. The CAPABOX adds a power capability of 2000W to the application. Consequently, a CAPABOX is required to extend the allowed continuous power to 5000W. "DC bus interfacing" application note - Issue 1.3

6 – APPENDIX 6.1 – XTRAPULSPAC RANGE COMPATIBILITY ISSUE The first delivered XtrapulsPac has got a different topology of the DC bus link. This topology offered the advantage to allow direct connection of external capacitors. However, for compatibility reasons, this topology has been abandoned. The differences are presented below. First version of XtrapulsPac Second version of XtrapulsPac C+ soft start soft start The compatibility issue between the current XtrapulsPac and the old one is summarized below: Application Compatibility issue Single-axis with AC supply Single-axis with AC supply and...