The PXT-FX increases productivity, saves energy and is an active buffer module for DC links.
Contact
Michael Koch GmbH
Phone: +49 7251 96 26-200
E-Mail: mail@bremsenergie.de
| Criteria | PxtFX |
|---|---|
| Weight | 6.0 kg (stand alone) |
| 9.6 kg (stand alone with 1 energy module) | |
| 13.3 kg (stand alone with 2 energy modules) | |
| Dimensions H x W x D | 297 x 100 x 167 mm (stand alone) |
| 297 x 100 x 276 mm (stand alone with 1 energy module) | |
| 297 x 100 x 385 mm (stand alone with 2 energy modules) | |
| Protection class | IP 20 |
| Ambient temperature | -10°C to +65°C (transport, storage) |
| 0°C to +40°C (operation) | |
| Humidity | ≤ 95% (transport, storage) |
| ≤ 85% (in operation) | |
| Cooling | Forced air cooling via fan. Operation in relation to heat sink temperature. Adjustable, e.g. for UPS application |
| Limitation for installations in elevated areas | < 2000 m NN: No limitations / overvoltage category III |
| > 2000 m NN: reduction of performance / overvoltage category II | |
| Recuperation of braking energy | Plug & Play due to automated detection of brake-chopper switch-on threshold UBRC |
| Min. starting voltage level for the system DC link or Energy storage |
Approx. 45 VDC |
| Min. Operating voltage level UZmin | 180 VDC (Wake-Up-Phase: UZStart 48-180 VDC) |
| Max. Operating voltage level UZmax | 848 VDC (UL) / 1000 VDC (IEC) |
| Operation conditions | UZ > UC. Otherwise immediate stop = safe separation of DC link from energy storage |
| 24 VDC In | Galvanically isolated For communication tasks with PxtFX without connecting it to DC link or energy storage, e.g. for setting parameters at the desk (Note: not protected against polarity reversal) |
| Energy of integrated capacities | 0 kJ (stand alone) |
| 2 kJ (stand alone with 1 energy module) | |
| 4 kJ (stand alone with 2 energy modules) | |
| Expansion of capacities | Expandable with PxtEX in steps of 2kJ |
| Capacity monitoring | Parameterizable |
| Max. Energy Storage current Ic | 17 A (UL) continuous |
| 20 A (IEC) continuous | |
| 40 A peak for 60s (Ieff = 20 A at tCycle = 240s) | |
| Max. Power Pmax | 7.65 kW (UL) / 9 kW (IEC) continuous |
| 18 kW peak for 60s (Ground rule for power flow PC = PZ) | |
| Operation frequency level | 15 kHz, in operation load-dependent reduction down to 7.5 kHz Adjustable up to 18 kHz (with power reduction) |
| Max. recuperation of energy | Cycle time 1s: 1 energy module up to 4.32 MJ/operating hour 2 energy modules up to 8.64 MJ/operating hour |
| Load monitoring | DC link side and energy storage side (in each case I²t) |
| Connection DC link | Front, top |
| Connection for PxtEX, EM or NEV | Front, bottom |
| Communication | 3 digital In 3 digital Out K-Bus interface for operating data output 4 LEDs SD-Card Reset-button for restart Boot-button for boot loading from SD-Card Option: PxtMX plug-on module for fieldbus communication etc. |
| Visualization | Charging indicator for each Energy module (flashing LED according to voltage level) |
| Firmware-Updates | On Koch company site (Fabrikle) or With SD-Card at customers site or Via PxtCC (USB K-Bus interface) with PC |
| Protection | Internal fuses Individual protection of each energy module |
| Precharging circuit | Connection directly to DC link interference-free possible, independent from further precharging circuits |
| Reverse polarity protection | To DC link: In case connecting with reverse polarity PxtFX blocks and disconnects the DC link side from energy storage side |
| Charging protection | To DC link |
| Charging protection switch LSS | Connection of charged Energy storage modules interference-free possible (But: No protection against connecting with reverse polarity!) |
| Max. cable length to DC link | 2 m |
| Max. cable length to energy storage modules | 20 m |
| Parallel operation | Theoretically unlimited number of devices Self-adjusting Automated Master-/Slave-setting for communication |
| Retrofit | Can be retrofitted into existing systems |
| Typeplate/Device information | Electronic via QR-Code: Further device specific information Management-features |
| Internal digital storage | Operation hours meter |
With a current load capability of 20 amps duration and 40 ampere peak for about one minute compared to storage, which may have a maximum voltage of 450 volts DC, the PxtFX can generate up to 18 kilowatts of power.
The device can be equipped ex works with a storage volume of two or four kilowatt seconds. Built into the device as standard is the automatic detection of the brake transistor switch-on voltage threshold, which enables the device to work with all commercially available frequency inverters and servo controllers in a plug & play manner. The extensive safety features of the PxtFX protect against reverse polarity of the DC link, against connecting loaded storage devices and overloading the system on both the storage and DC link sides. Internal fuses are standard.
A new feature of the PxtFX is the option of using an SD memory card, an external 24-volt supply, status displays via LEDs, boot loading and reset options and 6 digital I/Os. This is supplemented by output functions via a USB module.
The individual applications are manifold, do the devices bring benefits by a single feature or by the combination of two or more features.
The first thing that comes to mind is the recuperation of the machine’s braking energy, which increases energy efficiency. The PxtFX can save up to 1.2 kilowatt hours of energy in its smallest expansion stage in one-second cycles per operating hour. In relation to the application itself, savings of up to a good 40 percent can be achieved with the active energy management system based on the PxtFX.
Often, however, other benefits play a greater role than increasing energy efficiency, such as the compensation of so-called brownouts, safe and defined standstill during blackouts, the possible acceleration of production processes with output increases of up to 50 percent, the reduction of mains load peaks (“peak shaving”) or even the operation of the electric drive independently of the mains supply.
Video about the active energy management devices PxtFX from Michael Koch GmbH:
