PULS

Power supply unit

DIMENSION series

Q-series

Power supply unit (PSU) / DC/DC-Converter
25% power reserve

intermediate DC-bus and galvanic isolation
25% power reserve
DC-OK rly. contact output

384Vdc-672Vdc (500Vdc / 575Vdc / 600Vdc nom.)
450Vdc turn-ON voltage
325Vdc shutdown voltage

"DC-OK" LED

DC

20A (at 24Vdc)
17.5A (at 28Vdc)
12W/+60°C...+70°C (derating)

480W (at 24Vdc and 28Vdc)

24Vdc-28Vdc (adjustable)
500mV turn-ON overshoot

22ms (buffer time at 600Vdc input)

spring-clamp connections

output overvoltage protection (32Vdc typ. / 35Vdc max.)
Overload / short-circuit current -- min. 20A (max. 23A) load impedance <50mΩ
Series / parallel operation -- Power supplies can be paralleled to increase the output power. The output voltage of all power supplies shall be adjusted to the same value (+/-100mV) in Single use mode with the same load conditions on all units
Back-feeding loads max. 34V -- The unit is resistant and does not show malfunctioning when a load feeds back voltage to the DC/DC converter. It does not matter whether the DC/DC converter is ON or OFF. The absorbing energy can be calculated according to the built-in large sized output capacitor.

0.95 (600Vdc input)

65 mm

DIN rail mounting

W65mm x H124mm x D127mm

Aluminium housing

-25...+70 °C

3A peak max. inrush (at 600Vdc input)

(600Vdc input; full output load) 25.5 W

For galvanic isolation in mobile applications e.g. ships or forklifts

Commercialized

QTD20241

(output stage) 950 μF

CE marking
UL 508
EAC Registration
EN 61000-6-1 Immunity for residential environments
EN 61000-6-2 Immunity for industrial environments
EN 61000-6-4 Emission for industrial environments

DC 600V Input
Optimized for Intermediate DC-bus of Drive Systems
2 Input Fuses for DC 600V included
95% Full Load and Excellent Partial Load Efficiencies
Width only 65mm Weight only 890g
25% BonusPower 600W for up to 4s
Active Filtering of Input Transients
Full power between -25°C and +60°C
Extremely Low Input Inrush Current Surge
Reverse input polarity protection
DC-OK relay contact
Quick-connect Spring-clamp Terminals
3 Year warranty
Modern machines typically use maintenance-free AC motors which are controlled by frequency converters or servo amplifiers. Such devices have an intermediate DC-bus where all individual drives are connected. The QTD20 DC/DC converter can be connected directly to the intermediate DC-bus. In case of a mains failure the QTD20 utilizes the power from the DC-bus capacitors which are charged from the kinetic energy of the motor until the motor has come to a complete stop. The intermediate DC-bus is usually unfiltered and have high EMI noise so the QTD20 has a very robust input stage and an appropriate input filter included. Additionally the QTD20 is UL 508 approved and is equipped with input fuses which are rated and tested for 600Vdc applications.

(at 25°C; 10A output; 600Vdc input) 220000 hours
(at 40°C; 10A output; 600Vdc input) 78000 hours
(at 25°C; 20A output; 600Vdc input) 119000 hours
(at 40°C; 20A output; 600Vdc input) 42000 hours

100mVpp (20Hz...20MHz; 50Ω)

801000h (at 25°C; 600Vdc input; MTBF SN 29500 IEC 61709)
446000h (at 40°C; 600Vdc input; MTBF SN 29500 IEC 61709)
267000h (at 25°C; 600Vdc input; MTBF MIL HDBK 217F)
204000h (at 40°C; 600Vdc input; MTBF MIL HDBK 217F)

35s start-up delay (600Vdc input)
70ms rise time (nominal input; constant full current load; 0mF load capacitance)
110ms rise time (nominal input; constant full current load; 20mF load capacitance)