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PL508 Power supply System

The PL508 is a high sophisticated, high density, programmable 8-channel moderate floating low-voltage power supply system. Using the remote monitoring and control features it can be used to supply a large numbers of external load-channels with high power consumption also over long distances.

Dynamic behavior is adjustable via internal jumpers (long-medium-short sensed distances to loads).  Voltages, currents, temperatures and output power are programmed and controlled by the internal processor and illegal modes as well as failure will be detected.

The modular construction with a 19″ rack mountable power bin and a plug-in power supply box allows to swap the power supply without any tools and within shortest time.



  • Up to 8 independent, potential free outputs, total up to 3/6 kW DC output power
  • Fully self controlled (under / over voltage, over temperature, over current), programmable trip levels, voltage or current controlled operation
  • Programmable voltages and thresholds on voltages, currents and temperatures
  • Extremely low noise and ripple
  • Air cooled, self ventilated, with over temperature protection
  • CE conform EN 50 081/82 part 1 (EN 50 022 B), safety in accordance with EN 60 950
  • 94V – 265VAC world-wide auto-range AC input, with power factor correction / sinusoidal mains current EN 61000-3-2,
  • CAN-bus interface for remote monitoring and control available on all PL508s
  • Optionally with Power fail- and System Reset- Signals
  • Optional direct water cooling with same size as air cooled ones

Ordering Information

Standard configurations (others possible by request).

PL508 consists of:

=> Power Bin: 19” enclosure with CANbus (optional display / Ethernet) hosting Power Box

PBN508 LX – 3U3U x 19’’CANbus on front panel, Display, bottom air entry
PBN508 EX – 3U3U x 19’’Display, Ethernet, bottom air entry
PBN508 RAAO – 3U3U x 19’’Locking guides for power box extraction lever, no front panel
PBN508 LX – 4U4U x 19’’CANbus on front panel, Display, front/bottom air entry
PBN508 EX – 4U4U x 19’’Display, Ethernet, front/bottom air entry
PBN508 LX – 7U6U x 19’’CANbus on front panel, Display, front/bottom air entry
PBN508 EX – 7U6U x 19’’Display, Ethernet, front/bottom air entry

=> Power Box containing a PFC mains input module, a control card and 5 to 10 slots

TypeDimensionsInterlockSlots for MEH, MDH, MDLON/OFF Switch
PBX508 – 3U3U x 19’’Option – I5 (3kW)Option – GR
PBX508 – 3U+3U x 19’’Option – I6 (3kW)Option – GR
PBX508 – 6U6U x 19’’Option – I10 (3kW)Option – GR
PBX508 – 6UK6U x 19’’Option – I10 (6kW)Option – GR

=> Power Modules integrated into Power Box slots for a maximum of 5 modules (3U box) or 10 modules (6U box) with a maximum of 8 channels, single channel power modules are named MEH, two channel MDH or MDL.

TypeVoltage rangeChannels per modulePeak output / Power
MEH2V … 7V1115A / 550W
MEH7V … 16V146A / 550W
MEH12V … 30V123A / 550W
MEH30V … 60V113,5A / 650W
MDH2V … 7V2+/- 30A / 210W (420W total)
MDH7… 16V2+/- 23A / 250W (500W total)
MDL7… 24V2+/- 11,5A / 275W (550W total)
MDH30V … 60V2+/- 6A / 250W (500W total)

Technical Information

Regulation (fast circuit for short sensed distance)


MEH 550W/650W  <15mV +/-100% load, +/- full mains range
MDH (20A) <0.05% +/-100% load, +/- full mains range
MDL, MDH <0.1% +/-100% load, +/- full mains range
Dynamic (0,5 m wire)
MEH, MDH <100mV +/-25% load
MDL, MDH <0.7% +/-25% load

Recovery time (0,5 m wire) +/-25% load within +/-1% deviation within +/-0.1% dev.
Modules 550W 0.2ms 0.5ms
Modules 650W >30V 0.5ms 1.0ms
MDL, MDH 0.0ms 1.0ms

Conditions: Current slope <1000A/ms, 20mF per 100A parallel to load

Regulation (slow circuit for long sensed distance)


MEH 550W/650W  <15mV +/-100% load, +/- full mains range
MDL, MDH  <0.05% +/-100% load, +/- full mains range

Dynamic deviation depends on current slope resp. filter capacitors at load side only

Recovery time (40 m wire) 5V at load side, V drop < 2V   within +/-10% deviation within +/-1% deviation
MEH, MDH <150ms 250ms
MDL <150ms 320ms

Regulation timing adaptable to dynamic conditions (induced by cable length, voltage drops, sinker and filter capacities at load side)

DC output characteristics  
Sense compensation range limited to < 10V or nom voltage (except special versions)
Sense mode closed loop and continuously controlling regulator to load
Floating Range PL508 >nominal output voltage for MEH,
min. +/-10V for voltage ranges < 7V MEH and MDL

Noise and ripple    
0.5 m wire  (< 7V) <10mV peak to peak  0-20 MHz
0.5 m wire  (> 7V) <15mV peak to peak 0-20 MHz
10 m wire  <3mV peak to peak 0-300 MHz

Conditions at load side: parallel (X) 330µF and 1µF ceramic, 100nF HF conducting to case (Y) each line

EMC compatibility  
EN 61 000-6-3:2001 [RF emission]
EN 55 022:1998 + Corr:2001 + A1:2000 Class B conducted noise
EN 55 022:1998 + Corr:2001 + A1:2000 Class B radiated noise
EN 61 000-3-2:2001 harmonics
EN 61 000-3-3:1995 +Corr:1997 +A1:2001 flicker
EN 61 000-6-2:2001 [immunity]
EN 61 000-4-6:1996 + A1:2001 injected HF currents
EN 61 000-4-3:1996 + A1:1998 + A2:2001 radiated HF fields, ”900MHz”
EN 61 000-4-4:1995 + A1:2001 burst
EN 61 000-4-5:1995 + A1:2001 surge
EN 61 000-4-11:1994 + A1:2000 voltage variations
EN 61 000-4-2:1995 + A1:1998 + A2:2001 ESD

Emission: CE EN 50081-1 (EN 55 022-B)
Immunity: CE EN 50082-1 or 2
Operation temperature:  0....50°C without derating, storage: -30°C till 85°C
Temperature coefficient: < 0.2% / 10K
Stability (condition const.): <5mV or 0.1% within 24 h, <25mV or 0.3% within 6 months
Current limiting: 100% of nominal values, programmable to lower values via Interface or display tableau. In case of overcurrent:
Ilim  defines a constant current level, if status Umin set to 0V for the concerned channel, Imax defines the global trip off setpoint independant of status voltage window
Voltage rise:  Monotone and synchron. 50ms ramping (factory settings), other slope and different timing programmable
Voltage set:  discharge of output capacitors after DC off. 
OV protection: Factory setting to 125% of nominal values
Status control:
DC Off (trip off):
within 3ms if >2% (default) deviation from nominal or programmed values , after overload, overheat (temperature limits 90/110°C heat sink, 70°C ambient), overvoltage, undervoltage , all trip off points processor controlled and programmable / disabling
DC Off / On,      channel wise By setting status Umin and output Voltage of selected channel both to  0V 
Interlock input: High level or open: All outputs DC off (optional feature)
Temperature limits: 90°C mains input, 110°C  modules (heat sink), 70°C ambient internal
Efficiency: Power module: 75% 2V/ -83% >5V/ -85% >12V/-90%  >48V    for 230VAC input voltage
M T B F: >65,000 h (blower), electronics > 100,000 h at 40°C ambient


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