PULS QT40.241 technology data

QT40.241

Q-Series

POWER SUPPLY

 3AC 380-480V Wide-range Input
 Width only 110mm
 Efficiency up to 95.3%
 Excellent Partial Load Efficiency
 150% (1440W) Peak Load Capability
 Easy Fuse Tripping due to High Overload Current
 Active Power Factor Correction (PFC)
 Active Filtering of Input Transients
 Minimal Inrush Current Surge
 Three Input Fuses Included
 Current Sharing Feature for Parallel Use
 Full Power Between -25°C and +60°C
 DC-OK Relay Contact
 Shut-down Input
 3 Year Warranty

GENERAL DESCRIPTION

The most outstanding features of the DIMENSION Q­Series DIN-rail power supplies are the extremely high
efficiencies and the small sizes, which are achieved by a
synchronous rectification and other technological
designs.

Large power reserves of 150% support the starting of
heavy loads such as DC-motors or capacitive loads. In
many cases this allows the use of a unit from a lower
wattage class which saves space and money.

High immunity to transients and power surges as well as
low electromagnetic emission makes usage in nearly
every environment possible.

The integrated output power manager, the three input
fuses and near zero input inrush current make
installation and usage simple. Diagnostics are easy due
to the DC-ok relay, a green DC-OK LED and the red
overload LED.

A large international approval package for a variety of
applications makes this unit suitable for nearly every
application.

ORDER NUMBERS

Power Supply QT40.241 24-28V Standard unit

Accessory ZM2.WALL Wall mount bracket
SLR01 Redundancy module
UF20.241 Buffer unit

24V, 40A, THREE PHASE INPUT

SHORT-FORM DATA

Output voltage DC 24V
Adjustment range 24 - 28V
Output current 40 – 34.3A continuous
60 – 51.5A for typ. 4s
Output power 960W continuous
1440W for typ. 4s
Output ripple < 100mVpp 20Hz to 20MHz
Input voltage 3AC 380-480V -15%/+20%
Mains frequency 50-60Hz ±6%
AC Input current 1.65 / 1.35A at 3x400 / 480Vac
Power factor 0.88 / 0.90 at 3x400 / 480Vac
AC Inrush current typ. 4.5A peak
Efficiency 95.3 / 95.2% at 3x400 / 480Vac
Losses 47.3 / 48.4W at 3x400 / 480Vac
Temperature range -25°C to +70°C operational
Derating 24W/°C +60 to +70°C
Hold-up time typ. 25 / 25ms at 3x400 / 480Vac
Dimensions 110x124x127mm WxHxD

MARKINGS

IND. CONT. EQ.

UL 508

UL 60950-1

Class I Div 2

pending

Marine,pending

EMC, LVD

1/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

INDEX

Page Page

1.

Intended Use .......................................................3

2. Installation Requirements...................................3

3. AC-Input...............................................................4

4. DC-Input...............................................................5

5. Input Inrush Current ...........................................5

6. Output .................................................................6

7. Hold-up Time.......................................................8

8. DC-OK Relay Contact ..........................................9

9. Shut-down Input .................................................9

10. Efficiency and Power Losses..............................10

11. Reliability...........................................................11

12. Front Side and User Elements...........................12

13. Functional Diagram...........................................13

14. Terminals and Wiring........................................13

15. EMC....................................................................14

16. Environment......................................................15

17. Protection Features ...........................................16

18. Safety Features ..................................................16

19. Dielectric Strength ............................................16

20. Approvals...........................................................17

The information presented in this document is believed to be accurate and reliable and may change without notice.
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

21. Fulfilled Standards............................................ 17

22. Used Substances ............................................... 18

23. Physical Dimensions and Weight..................... 18

24. Accessories ........................................................ 19

25. Application Notes............................................. 20

25.1. Repetitive Pulse Loading..........................20

25.2. Peak Current Capability ...........................21

25.3. Back-feeding Loads ..................................21

25.4. External Input Protection.........................21

25.5. Charging of Batteries ...............................22

25.6. Output Circuit Breakers............................22

25.7. Using only 2 Legs of a 3-Phase System ....23

25.8. Parallel Use to Increase Output Power....24

25.9. Parallel Use for Redundancy ....................24

25.10. Daisy Chaining of Outputs .......................25

25.11. Series Operation .......................................25

25.12. Inductive and Capacitive Loads................25

25.13. Use in a Tightly Sealed Enclosure ............25

25.14. Mounting Orientations ............................26

TERMINOLOGY AND ABREVIATIONS

PE and symbol PE is the abbreviation for Protective Earth and has the same meaning as the symbol .

Earth, Ground This document uses the term “earth” which is the same as the U.S. term “ground”.

T.b.d. To be defined, value or description will follow later.

AC 400V A figure displayed with the AC or DC before the value represents a nominal voltage with

standard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)

400Vac A figure with the unit (Vac) at the end is a momentary figure without any additional

tolerances included.

50Hz vs. 60Hz As long as not otherwise stated, AC 380V and AC 400V parameters are valid at 50Hz and AC

480V parameters are valid at 60Hz mains frequency.

2/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

1. INTENDED USE

This device is designed for installation in an enclosure and is intended for the general use such as in industrial control,
office, communication, and instrumentation equipment.

Do not use this power supply in aircraft, trains and nuclear equipment where malfunction may cause severe personal
injury or threaten human life.

2. INSTALLATION REQUIREMENTS

This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to

the factory for inspection.
Mount the unit on a DIN-rail so that the output and input terminals are located on the bottom of the unit. For other

mounting orientations see de-rating requirements in this document. See chapter 25.14.
This device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do

not cover ventilation grid (e.g. cable conduits) by more than 30%!
Keep the following installation clearances: 40mm on top, 20mm on the bottom, 5mm on the left and right sides are

recommended when the device is loaded permanently with more than 50% of the rated power. Increase this clearance
to 15mm in case the adjacent device is a heat source (e.g. another power supply).

WARNING

- Do not use the power supply without proper grounding (Protective Earth). Use the terminal on the input block for
earth connection and not one of the screws on the housing.

- Turn power off before working on the device. Protect against inadvertent re-powering.

- Make sure that the wiring is correct by following all local and national codes.

- Do not modify or repair the unit.

- Do not open the unit as high voltages are present inside.

- Use caution to prevent any foreign objects from entering the housing.

- Do not use in wet locations or in areas where moisture or condensation can be expected.

- Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns.

Risk of electrical shock, fire, personal injury or death.

3/26

A

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

3. AC-INPUT

AC input nom. 3AC 380-480V TN, TT, IT-mains networks,

grounding of one phase is allowed except for UL508

applications
AC input range min. 3x 323-576Vac continuous operation
Allowed Voltage Phase to Earth 500Vac IEC 60664-1
Input frequency nom. 50–60Hz ±6%
Turn-on voltage typ. 3x 305Vac steady-state value, see Fig. 3-1
Shut-down voltage typ. 3x 275Vac steady-state value, see Fig. 3-1

3AC 400V 3AC 480V

Input current typ. 1.65A 1.35A at 24V, 40A, symmetrical phase voltage,

Power factor *) typ. 0.88 0.90 at 24V, 40A, see Fig. 3-4
Start-up delay typ. 500ms 600ms see Fig. 3-2
Rise time typ. 30ms 30ms 0mF, 24V, 40A, see Fig. 3-2
typ. 40ms 40ms 40mF, 24V, 40A, see Fig. 3-2
Turn-on overshoot max. 500mV 500mV see Fig. 3-2

*) The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.

Fig. 3-1 Input voltage range Fig. 3-2 Turn-on behavior, definitions

P

OUT

Rated input range

Input
Voltage

see Fig. 3-3

Turn-on

Shut-down

V

IN

275V 576Vac

305V

323V

Output
Voltage

- 5%

Start-up

delay

Rise

Time

Fig. 3-3 Input current vs. output load at 24V Fig. 3-4 Power factor vs. output load

Input Current, typ.

1.6A

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

Va

0

0

4

x

3

8

4

x

3

Output Current

4 8 12 16 20 24 28 32 36

c

c

a

V

0

40A

Power Factor, typ.

0.95

0.90

0.85

0.80

0.75

0.70

3x

480Vac

3x

400Vac

Output Current

4 8 12 16 20 24 28 32 36 40

Overshoot

4/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

4. DC-INPUT

DC input nom.

DC 600V

DC input range min. 450-800Vdc continuous operation
Allowed Voltage Line to Earth max. 820Vdc IEC 60664-1
DC input current typ. 2.3A / 1.3A 450Vdc / 800Vdc, at 24V, 40A
Turn-on voltage typ. 425Vdc steady state value
Shut-down voltage typ. 375Vdc steady state value

Fig. 4-1 Wiring for DC Input

Instructions for DC use:

a) Use a battery or similar DC source.

FUSE

FUSE

Power Supply

AC

L1

L2

L3

PE

+

-

DC

Load

b) Connect +pole to L1 and –pole to L2.
c) Terminal L3 remains unused, terminal screw of L3 must be

d) Use appropriate external fuses in the + and – lines which

e) Connect the PE terminal to a earth wire or to the machine

f) DC-operation is not included in the UL approval.

Battery

+

-

For other sources contact PULS

securely tightened.

are suitable for the DC-voltage.

ground.

Additional testing might be necessary.

5. INPUT INRUSH CURRENT

An active inrush limitation circuit limits the input inrush current after turn-on of the input voltage and after short
input voltage interruptions.

The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.

Inrush current max. 6A
typ. 4.5A
Inrush energy max. 1.5A

3AC 400V 3AC 480V

6A

peak

4.5A

peak

2

s 1.5A2s -25°C to +70°C

peak

peak

Inrush delay (A) typ. 500ms 600ms

Fig. 5-1 Input inrush current, typical behavior

A Inrush delay

Input Current

Input: 3x 400Vac
Output: 24V, 40A
Ambient: 25°C

Upper curve: Input current 2A / DIV

Output Voltage

A

Input Voltage

Middle curve: Input voltage 1000V / DIV
Lower curve: Output voltage 20V / DIV
Time basis: 100ms / DIV

-25°C to +70°C

-25°C to +70°C

5/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

6. OUTPUT

Output voltage nom. 24V
Adjustment range min. 24-28V guaranteed
max. 30V at clockwise end position of potentiometer
Factory setting typ. 24.1V ±0.2%, at full load, cold unit, in “single use” mode
typ. 24.1V ±0.2%, at full load, cold unit, in “parallel use” mode
typ. 25.1V at no load, cold unit, in “parallel use” mode
Line regulation max. 10mV 3x 323-576Vac
Load regulation max. 50mV in “single use” mode: static value, 0A Æ 40A, see Fig. 6-1

Ripple and noise voltage max. 100mVpp 20Hz to 20MHz, 50Ohm
Output capacitance typ. 10 200μF

Continuous output current and output power

Output current nom. 40A at 24V, see Fig. 6-1 and Fig. 6-2
nom. 34.3A at 28V, see Fig. 6-1 and Fig. 6-2
Output power nom. 960W
Short-circuit current min. 40A load impedance 25mOhm, see Fig. 6-1 and Fig. 6-2
max. 44A load impedance 25mOhm, see Fig. 6-1 and Fig. 6-2

Short term output current and output (BonusPower®)

The power supply is designed to support loads with a higher short-term power requirement without damage or
shutdown. The short-term duration is hardware controlled by an output power manager. The BonusPower® is
available on a repeated basis. Detailed information can be found in chapter 25.1.

®

Once BonusPower

has been suspended by the output power limiter, a timer disables the next BonusPower®
capability. The recovery timer will start as soon as the output voltage reaches the adjusted value again, which usually
happens after the load has been reduced.

Output current nom. 60A at 24V, see Fig. 6-1 and Fig. 6-2
nom. 51.5A at 28V, see Fig. 6-1 and Fig. 6-2
Output power nom. 1440W BonusPower®
Short-circuit current min. 60A load impedance 25mOhm, see Fig. 6-1 and Fig. 6-2
max. 68A discharge current of output capacitors not included
BonusPower

®

time typ. 4s at 24V, 60A
min. 3.5s duration until the output voltage dips
max. 4.5s see Fig. 6-3
BonusPower® recovery time typ. 7s Overload free time to reset power manager, see Fig. 6-4

Peak current capability (up to several milliseconds)

The power supply can deliver a peak current which is higher than the specified short term current. This helps to start
current demanding loads or to safely operate subsequent circuit breakers.

The extra current is supplied by the output capacitors inside the power supply. During this event, the capacitors will be
discharged and causes a voltage dip on the output. Detailed curves can be found in chapter 25.2.

Peak current voltage dips typ. from 24V to 19V at 80A for 50ms, resistive load
typ. from 24V to 12V at 200A for 2ms, resistive load
typ. from 24V to 10V at 200A for 5ms, resistive load

typ. 1000mV in “parallel use” mode: static value, 0A Æ 40A,

see Fig. 6-2

6/26

A

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

Fig. 6-1 Output voltage vs. output current in

Output Voltage

28V

“single use” mode, typ.

Adjustment

Range

24

20

16

12

8

4
0

Output Current

01020 4050

30 60

c
o

n
t

i

n
u
o
u
s

s
h

o
r

t

-

t
e

r
m

70

Fig. 6-2 Output voltage vs. output current in

Output Voltage

“parallel use” mode, typ.

(Parallel Use, typ.)

29V

28V

27V

26V

Continuously

allowed

25V

Factory

24V

setting

23V
22V

Output Current

02040

Fig. 6-3 Bonus time vs. output power Fig. 6-4 BonusPower® recovery time

Bonus Time

5s

4

3

2

1

0

110 120 130 140 150

Output Power

ma

m

x

.

n

i

.

Power
Demand

100%

Output
Voltage

Bonus

Time

160%

Limitation by
Power Manager

Recovery Time

Bonus Power disabled

The BonusPower

Fig. 6-5 BonusPower® after input turn-on

Input
Voltage

®

is available as soon as power comes on.

Adjustment

Range

Bonus
Power

60A503010

t

t

Output
Voltage

Output
Power

150%

100%

Bonus

Power

7/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

7. HOLD-UP TIME

3AC 400V 3AC 480V
Hold-up Time typ. 25ms 25ms at 24V, 40A, see Fig. 7-1
typ. 50ms 50ms at 24V, 20A, see Fig. 7-1

The hold-up times for an operation on only two legs of a three phase system differ, curves can be found in chapter

25.7.

Fig. 7-1 Hold-up time vs. input voltage Fig. 7-2 Shut-down behavior, definitions

Hold-up Time

50ms

40

30

20

10

0

320 360 400 440 3x480Vac

24V, 20A, typ.

24V, 20A, min.

V

4

2

4

,

,

4

V

4

2

Input Voltage

Input
Voltage

A

0

t

p

,

.

y

i

.

n

,

0

A

m

Output
Voltage

L1 L2 L3

- 5%

Hold-up Time

8/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

8. DC-OK RELAY CONTACT

This feature monitors the output voltage, which is produced by the power supply itself. It is independent of a back-fed
voltage from a unit connected in parallel to the power supply output.

Contact closes As soon as the output voltage reaches 90% of the adjusted output voltage.
Contact opens As soon as the output voltage dips more than 10% below the adjusted output voltage.

Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored.
Contact re-closes As soon as the output voltage exceeds 90% of the adjusted voltage.
Contact ratings max 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load
min 1mA at 5Vdc min. permissible load
Isolation voltage See dielectric strength table in section 19.

Fig. 8-1 DC-ok relay contact behavior

V

= V

OUT

ADJ

10%

0.9* V

ADJ

open

<

1ms

>

1ms

250ms

openclosed closed

9. SHUT-DOWN INPUT

This feature allows a switch-off of the output of the power supply with a signal switch or an external voltage. The
shut-down function ramps down and has no safety feature included. The shut-down occurs immediately while the
turn-on is delayed up to 350ms. In a shut-down condition, the output voltage is <2V and the output power is <0.5W.

The voltage between different –pole output terminals must be below 1V when units are connected in parallel. In a
series operation of multiple power supplies only wiring option “A” with individual signal switches is allowed.

Please note that option C requires a current sink capability of the voltage source. Do not use a blocking diode.

Fig. 9-1 Activation of the shut-down input

Option A:

Shut-

15

down
Input

OFF: linked
ON : open

16

Option B:

(via open
collector)

OFF: I > 0.3mA
ON : I < 0.1mA

n.c.

I

15

16

-

Shut­down
Input

Option C:

(via external
voltage

OFF: U < 1V
ON : U = 4 -29V

n.c.

+

U

16

-

down
Input

Shut-

15

9/26

A

A

c

c

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

10. EFFICIENCY AND POWER LOSSES

3AC 400V 3AC 480V

Efficiency typ. 95.3% 95.2% at 24V, 40A, 3-phase operation

typ. 94.4% 94.7% at 24V, 40A,

Average efficiency *) typ. 94.7% 94.6% 25% at 10A, 25% at 20A, 25% at 30A. 25% at

Power losses typ. 1.5W 1.5W with activated shut-down
typ. 9.5W 9.8W at 0A, 3-phase operation
typ. 47.3W 48.4W at 24V, 40A, 3-phase operation

typ. 56.9W 53.7W at 24V, 40A,

*) The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%

of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%
of the nominal load for the rest of the time.

Fig. 10-1 Efficiency vs. output current at 24V,

Efficiency

96%

typ., 3-phase operation

3x400Vac

95

94

93

92

8 1216202428323640

Output Current

3x480Vac

Fig. 10-2 Losses vs. output current at 24V,

Power Losses

60W

Fig. 10-3 Efficiency vs. input voltage at 24V,

40A, typ., 3-phase operation

Efficiency

95.5%

95.4

95.3

95.2

95.1

95.0

94.9
350 400 450 500 3x550Va

Input Voltage

Fig. 10-4 Losses vs. input voltage at 24V, 40A,

when using only 2 legs of a 3-phase system,
curves can be found in chapter 25.7.

40A, 3-phase operation

when using only 2 legs of a 3-phase system,
curves can be found in chapter 25.7.

typ., 3-phase operation

50

40

30

20

10

0

0481216202428 40

typ., 3-phase operation

Power Losses

50W

49

48

47

46

45

44

350 400 450 500 3x550Va

Output Current

Input Voltage

3x480Vac

3x400Vac

32 36

10/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

11. RELIABILITY

3AC 400V 3AC 480V
Lifetime expectancy
111 000h 104 000h at 24V, 20A and 40°C
179 000h 174 000h at 24V, 40A and 25°C

**) SN 29500, IEC 61709 375 000h 369 000h at 24V, 40A and 40°C

MTBF
685 000h 678 000h at 24V, 40A and 25°C
MTBF

**) MIL HDBK 217F 158 000h 157 000h at 24V, 40A and 40°C; Ground Benign GB40

211 000h 210 000h at 24V, 40A and 25°C; Ground Benign GB25

*) The Lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the lifetime

expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according to the
capacitor’s manufacturer specification. The prediction model allows only a calculation of up to 15 years from date of shipment.

**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a

device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.

*) 63 000h 62 000h at 24V, 40A and 40°C

11/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

12. FRONT SIDE AND USER ELEMENTS

A Input Terminals
Screw terminals
L1, L2, L3 Line input

B Output Terminals
Screw terminals, two per pole
+ Positive output
– Negative (return) output

Indicators, LEDs

Normal mode OFF ON Closed
During BonusPower® OFF ON Closed
Overload (Vout < 90%) ON OFF Open
Output short circuit ON OFF Open
Temperature Shut-down flashing OFF Open
Active Shut-down input flashing OFF Open
No input power OFF OFF Open

Fig. 12-1 Front side

...PE (Protective Earth) input

Overload LED DC-OK LED DC-OK Contact

“Parallel Use” “Single Use” selector

C

Set jumper to “Parallel Use” when power supplies are
connected in parallel to increase the output power. In order
to achieve a sharing of the load current between the
individual power supplies, the “parallel use” regulates the
output voltage in such a manner that the voltage at no load is
approx. 5% higher than at nominal load. See also chapter

25.8. A missing jumper is equal to a “Single Use” mode.
Factory set is “Single Use” mode.

Output voltage potentiometer

D

Open the flap to set the output voltage. Factory set: 24.1V

E DC-OK LED (green)

On, when the voltage on the output terminals is >90% of the
adjusted output voltage

F Overload LED (red)

- On, when the voltage on the output terminals is <90% of
the adjusted output voltage, or in case of a short circuit in the
output. Input voltage is required

- Flashing, when the shut-down has been activated or the unit
has switched off due to over-temperature.

DC-OK Relay Contact

G

The DC-OK relay contact is synchronized with the DC-OK LED.
See chapter 8 for details.

Shut-down Input

H

Allows the power supply to be shut down. Can be activated
with a switch contact or an external voltage.
See chapter 9 for details.

12/26

QT40.241

Q-Series

13. FUNCTIONAL DIAGRAM

L1
L2
L3

Input Fuses
Input Filter
Input Rectifier
Inrush Limiter
Transient Filter

Temper-

ature
Shut-

down

Fig. 13-1 Functional diagram

PFC

Converter

Output

Power

Manager

Output

Over-

Voltage

Protection

Power

Converter

Output
Voltage
Monitor

Output

Voltage

Regulator

Output

Filter

DC ok
Relay

Shut-

down

24V, 40A, THREE PHASE INPUT

Single /
Parallel

V

OUT

+
+

-

-

Overload
LED

DC-ok
LED

13

DC-ok
Contact

14

15

Shut­down
Input

16

14. TERMINALS AND WIRING

Type

Solid wire 0.5-6mm2 0.5-16mm2 0.15-1.5mm2
Stranded wire 0.5-4mm2 0.5-10mm2 0.15-1.5mm2
American Wire Gauge 20-10 AWG 22-8 AWG 26-14 AWG
Wire stripping length 7mm / 0.28inch 12mm / 0. 5inch 7mm / 0.28inch
Screwdriver 3.5mm slotted or

Recommended tightening torque 0.8Nm, 7lb.in 0.8Nm, 7lb.in Not applicable

Instructions:

a) Use appropriate copper cables that are designed for an operating temperature of:

60°C for ambient up to 45°C and 75°C for ambient up to 60°C minimum.

b) Follow national installation codes and installation regulations!

c) Ensure that all strands of a stranded wire enter the terminal connection!
d) Up to two stranded wires with the same cross section are permitted in one connection point (except PE wire).
e) Do not use the unit without PE connection.
f) Screws of unused terminal compartments should be securely tightened.
g) Ferrules are allowed, but not required

Input Output DC-OK, Shut-down

screw termination screw termination spring-clamp termination

Pozidrive No 2

3.5mm slotted or
Pozidrive No 2

3.5mm slotted

13/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

15. EMC

The power supply is suitable for applications in industrial environment as well as in residential, commercial and light
industry environment without any restrictions. The CE mark indicates conformance with EMC guideline 89/336/EC,
93/68/EC and 2004/108/EC and the low-voltage directive (LVD) 73/23/EC and 2006/95/EC. A detailed EMC report is
available on request.

EMC Immunity

Electrostatic discharge EN 61000-4-2 Contact discharge

Electromagnetic RF field EN 61000-4-3 80MHz-2.7GHz 10V/m Criterion A
Fast transients (Burst) EN 61000-4-4 Input lines

Surge voltage on input EN 61000-4-5 L1 Æ L2, L2 Æ L3, L1 Æ L3 2kV Criterion A
Surge voltage on input EN 61000-4-5 L1 / L2 / L3 Æ PE 4kV Criterion A
Surge voltage on output EN 61000-4-5 + Æ -

Conducted disturbance EN 61000-4-6 0.15-80MHz 10V Criterion A
Mains voltage dips

(Dips on three phases)
Mains voltage dips

(Dips on two phases)

Voltage interruptions EN 61000-4-11 0Vac, 5000ms Criterion C
Voltage sags SEMI F47 0706 Dips on two phases according to section 7.2. of the SEMI F47 standard
80% of 380Vac

Powerful transients VDE 0160 Over entire load range 1550V, 1.3ms Criterion A

Criterions:
A: Power supply shows normal operation behavior within the defined limits.

C: Temporary loss of function is possible. Power supply may shut-down and restarts by itself. No damage or hazards for the power supply

will occur.

EMC Emission

Conducted emission EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22 Class B, input lines
Radiated emission EN 55011, EN 55022 Class B
Harmonic input current EN 61000-3-2 fulfilled
Voltage fluctuations, flicker EN 61000-3-3 fulfilled
This device complies with FCC Part 15 rules.

Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) this
device must accept any interference received, including interference that may cause undesired operation.

Switching Frequencies

Switching frequency 1 105kHz nearly constant
Switching frequency 2 1kHz to 150kHz load dependent
Switching frequency 3 40kHz to 300kHz input voltage and load dependent

According generic standards: EN 61000-6-1 and EN 61000-6-2

8kV

Air discharge

Output lines

+ / - Æ PE

EN 61000-4-11 0% of 380Vac

0% of 480Vac

EN 61000-4-11 40% of 380Vac

40% of 480Vac
70% of 380Vac
70% of 480Vac

70% of 380Vac
50% of 380Vac

According generic standards: EN 61000-6-3 and EN 61000-6-4

The power supply has three converters with three different switching frequencies
included. One is nearly constant. The other two are input voltage and load dependent.

15kV

4kV
2kV

500V
500V

0Vac, 20ms
0Vac, 20ms

200ms
200ms
500ms
500ms

1000ms
500ms
200ms

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A
Criterion A
Criterion A

Criterion A
Criterion A
Criterion A

14/26

C

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

16. ENVIRONMENT

Operational temperature
Storage temperature -40 to +85°C (-40°F to 185°F) for storage and transportation
Output de-rating 24W/°C 60-70°C (140°F to 158°F)
Humidity **) 5 to 95% r.H. IEC 60068-2-30
Vibration sinusoidal 2-17.8Hz: ±1.6mm; 17.8-500Hz: 1g

Shock 15g 6ms, 10g 11ms

Altitude 0 to 6000m (0 to 20 000ft) Reduce output power or ambient temperature

Altitude de-rating 60W/1000m or 5°C/1000m > 2000m (6500ft), see Fig. 16-2
Over-voltage category III IEC 62103, EN 50178, altitudes up to 2000m
II Altitudes from 2000m to 6000m
Degree of pollution 2 IEC 62103, EN 50178, not conductive

*) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
**) Do not energize while condensation is present

Fig. 16-1 Output current vs. ambient temp. Fig. 16-2 Output current vs. altitude

Allowed Output
Current at 24V

60A

50

40

30

20

10

0

Ambient Temperature

-25 0 20 40

*) -25°C to +70°C (-13°F to 158°F) reduce output power according Fig. 16-1

IEC 60068-2-6

2 hours / axis

IEC 60068-2-27

3 bumps / direction, 18 bumps in total

above 2000m sea level.

Allowed Output
Current at 24V

f

o

t

y

r

p

.

s

4

c

o

n

t

i

n

u

o

u

s

70°

60

60A

40

30

20

10

50

f

o

r

p

t

y

4

.

s

c

o

n

t

i

n

u

o

u

s

A

.

.

.

m

a

T

b

<

.

.

B

.

.

.

C

.

6

m

a

T

<

b

5

m

a

T

<

b

4

0

0 2000 4000

C

B

A

0

°

C

0

°

C

0

°

C

Altitude

6000m

15/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

17. PROTECTION FEATURES

Output protection Electronically protected against overload, no-load and short-circuits
Output over-voltage protection typ. 30Vdc

max. 32Vdc

Degree of protection IP 20 EN/IEC 60529
Penetration protection > 5mm e.g. screws, small parts
Over-temperature protection yes Output shut-down with automatic restart
Input transient protection MOV (Metal Oxide Varistor) and active transient filter
Internal input fuse 3x T6.3A H.B.C. not user replaceable

*) In case of a protection event, audible noise may occur.

In case of an internal power supply defect, a redundant
circuit limits the maximum output voltage. The output
shuts down and automatically attempts to restart.

*)

18. SAFETY FEATURES

Input / output separation
PELV IEC/EN 60204-1, EN 50178, IEC 62103, IEC 60364-4-41
Class of protection I PE (Protective Earth) connection required
Isolation resistance > 5MOhm Input to output, 500Vdc
PE resistance < 0.1Ohm
Touch current (leakage current) typ. 0.35mA 3x 400Vac, 50Hz, TN mains
typ. 0.45mA 3x 480Vac, 60Hz, TN mains
< 0.45mA 3x 440Vac, 50Hz, TN mains
< 0.60mA 3x 528Vac, 60Hz, TN mains

*) Double or reinforced insulation

*) SELV IEC/EN 60950-1

19. DIELECTRIC STRENGTH

The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by
the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies the
voltage with a slow ramp (2s up and 2s down). Connect all phase-terminals together as well as all output poles before
conducting the test. When testing, set the cut-off current settings to the value in the table below.

Fig. 19-1 Dielectric strength

Input DC-ok

L1
L2
L3

A

Earth

B

B

C

D

Output

Shut-down

-

+/-

Type test 60s 2500Vac 3000Vac 500Vac 500Vac

Factory test 5s 2500Vac 2500Vac 500Vac 500Vac

Field test 5s 2000Vac 2000Vac 500Vac 500Vac

Cut-off current setting > 10mA > 10mA > 80mA > 10mA

To fulfil the PELV requirements according to EN60204-1 § 6.4.1, we
recommend that either the + pole, the – pole or any other part of
the output circuit shall be connected to the protective earth
system. This helps to avoid situations in which a load starts
unexpectedly or can not be switched off when unnoticed earth
faults occur.

A B C D

16/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

20. APPROVALS

IEC 60950-1

UL 508

IND. CONT. EQ.

UL 60950-1

Class I Div 2
pending

The unit is suitable for use in Class I Division 2 Groups A, B, C, D locations.

Substitution of components may impair suitability for Class I Division 2 environment.
Do not disconnect equipment unless power has been switched off. Wiring must be
in accordance with Class I, Division 2 wiring methods of the National Electrical Code,
NFPA 70, and in accordance with other local or national codes.

Marine,
pending

SEMI F47

CB Scheme,
Information Technology Equipment

LISTED for use as Industrial Control Equipment;
U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E198865
Mains supply circuit: 3-wire + PE, star

Recognized for use as Information Technology Equipment,
Level 5; U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950);
E-File: E137006

Recognized for use in Hazardous Location Class I Div 2 Tx
Groups A,B,C,D systems; U.S.A. (ANSI / ISA 12.12.01-2007) and
Canada (C22.2 No. 213-M1987);
E-File: E246877

GL (Germanischer Lloyd) classified and
ABS (American Bureau for Shipping) PDA
Environmental category: C, EMC2

Marine and offshore applications
SEMI F47-0706

Ride-through compliance for the semiconductor industry.
Full SEMI range compliance
(Dips on two phases: 304Vac for 1000ms, 266Vac for 500ms
and 190Vac for 200ms, Pout < 960W)

21. FULFILLED STANDARDS

EN 61558-2-17 Safety of Power Transformers
EN/IEC 60204-1 Safety of Electrical Equipment of Machines
EN/IEC 61131-2 Programmable Controllers
EN 50178, IEC 62103 Electronic Equipment in Power Installations

17/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

22. USED SUBSTANCES

The unit does not release any silicone and is suitable for use in paint shops.
The unit conforms to the RoHS directive 2002/96/EC
Electrolytic capacitors included in this unit do not use electrolytes such as Quaternary Ammonium Salt Systems.
Plastic housings and other molded plastic materials are free of halogens, wires and cables are not PVC insulated.
The production material within our production does not include following toxic chemicals:

Polychlorized Biphenyl (PCB), Polychlorized Terphenyl (PCT), Pentachlorophenol (PCP), Polychlorinated naphthalene
(PCN), Polybrom Biphenyll (PBB), Polybrom Bipheny-oxyd (PBO), Polybrominated Diphenylether (PBDE), Polychlorinated
Diphenylether (PCDE), Polydibromphenyl Oxyd (PBDO), Cadmium, Asbestos, Mercury, Silicia

23. PHYSICAL DIMENSIONS AND WEIGHT

Weight 1500g / 3.31lb
DIN-Rail Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.

The DIN-rail height must be added to the unit depth (127mm) to calculate the total required
installation depth.

Installation Clearances See chapter 2

Fig. 23-1 Front view Fig. 23-2 Side view

18/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

24. ACCESSORIES

ZM2.WALL Wall mounting bracket
This bracket is used to mount specific DIMENSION units onto a flat surface without utilizing a DIN-Rail.

Fig. 24-1 ZM2.WALL Wall mounting bracket Fig. 24-2 Assembled wall mounting bracket

Buffer module UF20.241

This buffer unit is a supplementary device for DC 24V power supplies. It delivers power to bridge typical mains failures

or extends the hold-up time after turn-off of the AC power. In times when the
power supply provides sufficient voltages, the buffer unit stores energy in
integrated electrolytic capacitors. In case of mains voltage fault, this energy is
released again in a regulated process. One buffer module can deliver 20A. To buffer
the full output current of 40A, two buffer modules are needed in parallel.

The buffer unit does not require any control wiring. It can be added in parallel to
the load circuit at any given point. Buffer
units can be added in parallel to increase
the output ampacity or the hold-up time.

AC

Power
Supply

Buffer

Unit(s)

Load

DC

+

-

19/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

25. APPLICATION NOTES

25.1. REPETITIVE PULSE LOADING

Typically, a load current is not constant and varies over time. This power supply is designed to support loads with a
higher short-term power demand (=BonusPower
power manager and is available on a repeated basis. If the BonusPower® load lasts longer than the hardware
controller allows it, the output voltage will dip and the next BonusPower
time (see chapter 6) has elapsed.

To avoid this, the following rules must be met:

a) The power demand of the pulse must be below 150% of the nominal output power.
b) The duration of the pulse power must be shorter than the allowed BonusPower
c) The average (R.M.S.) output current must be below the specified continuous output current.

If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use the
maximum duty cycle curve (Fig. 25-2) to check if the average output current is below the nominal current.

d) The duty cycle must be below 0.75.

Fig. 25-1 Repetitive pulse loads, definitions Fig. 25-2 Max. duty cycle curve

P

max.

150%

100%

PEAKTPEAK

P

P

Base load (W)

0

Pulse load (above 100%)

P

PEAK

Duration between pulses (s)

T

0

Pulse duration (s)

T

PEAK

0

T

0

Example: A load is powered continuously with 480W (= 50% of the rated output load). From time to time a peak

power of 1440W (= 150% of the rated output load) is needed for 1 second.

The question: How often can this pulse be supplied without overloading the power supply?

- Make a vertical line at P

PEAK

curve. Read the max. duty cycle from the duty cycle-axis (= 0.37)

- Calculate the required pause (base load) length T

- Result: The required pause length = 1.7s

- Max. repetition rate = pulse +pause length = 2.7s

More examples for pulse load compatibility:

P

P

PEAK

T

0

PEAK

T0 P
1440W 960W 1s >25s 1440W 480W 0.1s >0.16s
1440W 0W 1s >1.3s 1440W 480W 1s >1.6s
1200W 480W 1s > 0.75s 1440W 480W 3s >4.9s

®

). The short-term duration is hardware controlled by an output

®

is available after the BonusPower® recovery

®

time. (see output section)

P

=

0

1

Duty Cycle

0.75

0.6

0.4

0.2

=

P0

0

1

%

0

0

110 120 130 140

T

T

peak -

=

peak

T

peak + T0

(D

utyCycle

D

utyCycle

x T

peak

)

D

utyCycle

T0 =

%

0

P

=

0

5

%

0

P

=

5

7

%

0

P

PEAK

150%100

= 150% and a horizontal line where the vertical line crosses the P0 = 50%

:

0

T

peak -

(D

utyCycle

x T

peak

)

1s - (0.37 x 1s)

==1.7s

0.37

P

PEAK

T

0

PEAK

T0=

T0

D

utyCycle

20/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

25.2. PEAK CURRENT CAPABILITY

Solenoids, contactors and pneumatic modules often have a steady state coil and a pick-up coil. The inrush current
demand of the pick-up coil is several times higher than the steady-state current and usually exceeds the nominal
output current (including the PowerBoost). The same situation applies when starting a capacitive load.

Branch circuits are often protected with circuit breakers or fuses. In case of a short or an overload in the branch circuit,
the fuse needs a certain amount of over-current to trip or to blow. The peak current capability ensures the safe
operation of subsequent circuit breakers.

Assuming the input voltage is turned on before such an event, the built-in large sized output capacitors inside the
power supply can deliver extra current. Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:

Fig. 25-3 Peak load 80A for 50ms, typ. Fig. 25-4 Peak load 200A for 5ms, typ.

24V

80A

Output
Voltage

19V

24V

200A

Output

Voltage

10V

Output
Current

0A

Peak load 80A (resistive) for 50ms
Output voltage dips from 24V to 19V.

10ms/DIV

Output
Current

0A

Peak load 200A (resistive) for 5ms
Output voltage dips from 24V to 10V.

1ms/DIV

25.3. BACK-FEEDING LOADS

Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (E

This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.
It does not matter whether the power supply is on or off.

The maximum allowed feed-back-voltage is 35Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 6.

lectro Magnetic Force).

25.4. EXTERNAL INPUT PROTECTION

The unit is tested and approved for branch circuits up to 30A (U.S.A.) and 32A (IEC). An external protection is only
required if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In
some countries local regulations might apply.

If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 6A B- or 6A C-Characteristic breaker should be used

21/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

25.5. CHARGING OF BATTERIES

The power supply can be used to charge lead-acid or maintenance free VRLA batteries. (Two 12V batteries in series)

Instructions for charging batteries:

a) Set jumper on the front of the unit into “Parallel Use”
b) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge

voltage.

End-of-charge voltage 27.8V 27.5V 27.15V 26.8V

Battery temperature 10°C 20°C 30°C 40°C

c) Use a 50A circuit breaker (or blocking diode) between the power supply and the battery.
d) Ensure that the output current of the power supply is below the allowed charging current of the battery.
e) Use only matched batteries when putting 12V types in series.
f) The return current to the power supply (battery discharge current) is typ. 35mA when the power supply is

switched off (except in case a blocking diode is utilized).

25.6. OUTPUT CIRCUIT BREAKERS

Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are without doubt, one of the most efficient
and economical ways to open circuits on faulty branches. Most of these breakers may also be used on 24V branches.

MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to
the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.

To avoid voltage dips and under-voltage situations in adjacent 24V branches which are supplied by the same source, a
fast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly to
the ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.
The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following
table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire cross
section and wire length.

Power Supply

AC

S1... Fault simulation switch

*) Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).

Fig. 25-5 Test circuit

MCB

+

-

DC

Wire length

Load

+

S1

-

Maximal wire length

C-2A
C-3A
C-4A
C-6A
C-8A
C-10A
B-6A
B-10A
B-13A
B-16A
B-20A

0.75mm² 1.0mm² 1.5mm² 2.5mm²

*)

for a magnetic (fast) tripping:

24m 34m 48m 74m
18m 31m 46m 72m
17m 23m 31m 53m
11m 16m 21m 37m

7m 10m 14m 21m

4m 6m 8m 11m
22m 24m 46m 73m
11m 14m 21m 30m

9m 11m 16m 24m

5m 6m 8m 13m

1m 2m 4m 5m

22/26

C

A

A

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

25.7. USING ONLY 2 LEGS OF A 3-PHASE SYSTEM

The power supply is allowed to run on two legs of a 3-phase system. No external
protection devices are required to protect against a phase-loss failure. However,
a permanent operation on two legs of a 3-phase system is not recommended for
this power class since the supplying 3-phase network can become unbalanced.

The output power must be reduced according to the curves below when
operation on only two legs of a 3-phase system. A long-term exceeding of these
limits will result in a thermal shut-down of the unit. A use below 340Vac with
more than 30A output current can also result in a thermal shut-down.

During power-on, some start-up attempts can occur until a permanent output power is available.
EMC performance, hold-up time, losses and output ripple differ from a three phase operation. Therefore, check

suitability of your individual application.
Such use is not included in the UL approval. Additional tests might be necessary when the complete system has to be

approved according to UL 508 or UL60950-1.
The screw of the terminal which remains unused must be securely tightened.

Output current vs. ambient temperature

Allowed Output Current for Use on only Two
Legs of a 3-Phase System

40A

30

20

10

A

.

.

.

B

.

.

.

C

.

.

.

0

-25 0 20

Fig. 25-6

2

6

x

4

0

o

t

5

5

V

2

a

2

x

4

3

0

t

m

x

a

.

0

6

Ambient Temperature

c

o

6

4

a

V

0

c

c

s

e

o

n

d

s

C

A

B

40 60

70°

Hold-up time vs. input voltage

Hold-up Time for Use on only Two Legs of a
Three Phase System

50ms

40

30

20

10

0

320 360 400 440 3x480Vac

Efficiency vs. output current at 24V

Efficiency for Use on only Two Legs of a 3­Phase System

96%

95

94

93

92

8 12162024283236

Fig. 25-8

2x480Vac

2x400Vac

Output Current

40

Losses vs. output current at 24V

Power Losses for Use on only Two Legs of a 3­Phase System

60W

50

40

30

20

10

02468101214 20

L1
L2
L3
PE

Fig. 25-7

24V, 20A, typ.

24V, 20A, min.

2

V

4

2

4

V

Input Voltage

Fig. 25-9

Output Current

,

4

,

A

0

t

y

,

,

4

0

A

m

i

2x400Vac

2x480Vac

16 18

p

n

open

.

.

Power Supply

AC

L1

L2

L3

DC

23/26

QT40.241

Q-Series

25.8. PARALLEL USE TO INCREASE OUTPUT POWER

Power supplies from the same series (Q-Series) can be paralleled to increase
the output power. The output voltage shall be adjusted to the same value
(±100mV) in “Single use” mode at with the same load conditions on all units,
or the units can be left with the factory settings. After the adjustments, the
jumper on the front of the unit shall be moved from “Single use” to
“Parallel use” mode in order to achieve load sharing. The “Parallel use”
mode regulates the output voltage in such a manner that the voltage at no
load is approx. 5% higher than at nominal load. If no jumper is plugged in,
the unit is in “Single use” mode. Factory setting is also “Single use” mode. A
fuse (or diode) on the output of each unit is only required if more than three
units are connected in parallel. Keep an installation clearance of 15mm (left / right) between two power supplies and
avoid installing the power supplies on top of each other. Do not use power supplies in parallel in mounting
orientations other than the standard mounting orientation (input and output terminals on the bottom of the unit) or
in any other condition where a derating of the output current is required (e.g. altitude, above 60°C, …). Pay attention
that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

24V, 40A, THREE PHASE INPUT

Unit A

AC

DC

Unit B

AC

DC

Fuse

+

-

Fuse

+

+

-

-

25.9. PARALLEL USE FOR REDUNDANCY

Load

Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a
certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is
automatically able to support the load current without any interruption. Redundant systems for a higher power
demand are usually built in a N+1 method. E.g. five power supplies, each rated for 40A are paralleled to build a 160A
redundant system. For N+1 redundancy the same restrictions apply as for increasing the output power, see also section

25.8.

Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in
the secondary side of the power supply. In such a case, the defective unit becomes a load for the other power supplies
and the output voltage can not be maintained any more. This can be avoided by utilizing decoupling diodes which are
included in the redundancy module SLR01.

Recommendations for building redundant power systems:

a) Use separate input fuses for each power supply.
b) Set the power supply into “Parallel Use” mode.
c) Monitor the individual power supply units. Therefore, use the DC-OK relay contact of the QT40 power supply.
d) It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.

24/26

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

25.10. DAISY CHAINING OF OUTPUTS

Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current
through one terminal pin does not exceed 54A. If the current is higher, use a separate distribution terminal block.

Fig. 25-10 Daisy chaining of outputs Fig. 25-11 Using distribution terminals

Distribution

- -

Terminals

Unit A

AC

DC

Unit B

AC

DC

Load

+

-

+

-

+

-

Earth
(see notes)

Power

Supply

- -

+ +

Output

Power

Supply

- -

+ +

Output

max 54A!

Load

+

Power

Supply

- -

-

+ +

Output

25.11. SERIES OPERATION

Power supplies of the same type can be connected in series for higher output
voltages. It is possible to connect as many units in series as needed, providing
the sum of the output voltage does not exceed 150Vdc. Voltages with a
potential above 60Vdc are not SELV any more and can be dangerous. Such
voltages must be installed with a protection against touching. Earthing of the
output is required when the sum of the output voltage is above 60Vdc. Avoid
return voltage (e.g. from a decelerating motor or battery) which is applied to
the output terminals. Keep an installation clearance of 15mm (left / right)
between two power supplies and avoid installing the power supplies on top of
each other. Pay attention that leakage current, EMI, inrush current, harmonics
will increase when using multiple power supplies.

Power
Supply

+ +

Output

+

Load

-

25.12. INDUCTIVE AND CAPACITIVE LOADS

The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.

25.13. USE IN A TIGHTLY SEALED ENCLOSURE

When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.

The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply is placed in the middle of the box, no other heat producing items are inside the box
Enclosure: Rittal Typ IP66 Box PK 9522 100, plastic, 250x180x165mm

Load: 24V, 32A; (=80%) load is placed outside the box
Input: 3x 400Vac
Temperature inside enclosure: 57.5°C (in the middle of the right side of the power supply with a distance of 2cm)
Temperature outside enclosure: 23.6°C
Temperature rise: 33.9K

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C

C

C

C

C

QT40.241

Q-Series

24V, 40A, THREE PHASE INPUT

25.14. MOUNTING ORIENTATIONS

Mounting orientations other than input terminals on the bottom and output on the top require a reduction in
continuous output power or a limitation in the max. allowed ambient temperature. The amount of reduction
influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous
operation can be found below:

Curve A1 Recommended output current.
Curve A2 Max allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 25-12
Mounting
Orientation A

(Standard
orientation)

Fig. 25-13

Mounting
Orientation B

(Upside down)

Power
Supply

OUTPUTINPUT

OUTPUTINPUT

Supply

Power

Fig. 25-14

Mounting
Orientation C

(Table-top
mounting)

Fig. 25-15

Mounting
Orientation D

(Horizontal cw)

OUTPUTINPUT

Supply

Power

Fig. 25-16

Mounting
Orientation E

(Horizontal ccw)

OUTPUTINPUT

Power

Supply

Output Current

40A

30

20

10

0

Ambient Temperature

10 20 30 40

Output Current

40A

30

20

10

0

Ambient Temperature

10 20 30 40

Output Current

40A

30

20

10

0

Ambient Temperature

10 20 30 40

Output Current

40A

30

20

10

0

Ambient Temperature

10 20 30 40

Output Current

40A

30

20

10

0

Ambient Temperature

10 20 30 40

A

1

60°

50

A

2

A

1

50

A

2

A

1

50

50

50

60°

60°

A

2

A

1

60°

A

2

A

1

60°

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