Rockwell Automation 1606-XLDF120E User manual

DC/DC Converter 24V, 5 A
Catalog Number 1606-XLDF120E
Reference Manual Original Instructions

2Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
DC/DC Converter 24V, 5 A Reference Manual
Important User Information
Read this document and the documents listed in the additional resources section about installation, configuration, and
operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize
themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.
Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to
be carried out by suitably trained personnel in accordance with applicable code of practice.
If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be
impaired.
In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use
or application of this equipment.
The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and
requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software
described in this manual.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
Labels may also be on or inside the equipment to provide specific precautions.
WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment,
which may lead to personal injury or death, property damage, or economic loss.
ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property
damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.
IMPORTANT Identifies information that is critical for successful application and understanding of the product.
SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous
voltage may be present.
BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may
reach dangerous temperatures.
ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to
potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL
Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 3
Table of Contents
Terminology and Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Catalog Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input Inrush Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Soft Start Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Peak Current Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Hold-up Time. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Efficiency and Power Losses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Front Side and User Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Terminals and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Lifetime Expectancy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Mean Time Between Failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electromagnetic Compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Protection Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Safety Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Dielectric Strength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Fulfilled Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Physical Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1606-XLB Wall Mounting Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1606-XLA-S37 Side Mount Bracket. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Peak Current Capability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Back-feeding Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Inductive and Capacitive Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Charging of Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
External Input Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Requirements for the Supplying Source . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Parallel Use to Increase Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Parallel Use for Redundancy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Daisy Chaining of Outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Series Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Use in a Tightly Sealed Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Mounting Orientations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Additional Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Notes:

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 5
Terminology and
Abbreviations
All values in this document are specified under the following conditions unless
otherwise noted:
• 24V, 5 A, 48V DC input voltage
• 25 °C (77 °F) ambient temperature
• after a 5 minutes run-in time
Product Overview
Product features:
•48VDCinput
•Isolated24VDCoutput
• Efficiency up to 90.3%
• Width only 32 mm (1.26 in.)
• 20% output power reserves
• Full power between -25…+60 °C (-13…+140 °F)
• Soft start function included
• Minimal inrush current surge
• Reverse input polarity protection
Terms Descriptions
PE The abbreviation for Protective Earth. PE has the same meaning as the symbol.
The symbol for Protective Earth.
Earth, Ground This document uses the term “earth” which is the same as the U.S. term “ground”.
DC 24V A value that is displayed with the AC or DC before the value represents a nominal voltage with standard tolerances included. For example, DC 12V describes a 12V battery
disregarding whether it is full (13.7V) or flat (10V).
24V DC A value with the unit (V AC or V DC) at the end is a momentary value without any
additional tolerances included.
nom Indicates a nominal value.
typ Indicates a typical value.
— (alone in table cell) A dash alone in a table cell indicates that there is no information to be included in that
cell.
Figure 1 - 1606-XLDF120E The 1606-XLDF120E is a DIN rail DC/DC
converter in the 92…120 W output power range
in a compact housing. This DC/DC converter can
run with a battery or similar sources. The
1606-XLDF120E converts a 48V voltage to a 24V
voltage.
The 1606-XLDF120E includes a power reserve of
20%. This extra power can be used continuously
up to 45 °C (113 °F).
The output is safely electrically isolated from the
input. The input is protected against reversed
voltages, and includes a soft start function.

6Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Specifications
Catalog Numbers
Attributes Values Notes
Output voltage DC 24V —
Adjustment range(1)
(1) Extended guaranteed adjustment range down to 23V.
24…28V —
Output current 5…4.3 A Ambient < 60 °C (140 °F)
6…5.2 A Ambient < 45 °C (113 °F)
Output power 120 W Ambient < 60 °C (140 °F)
144 W Ambient < 45 °C (113 °F)
Output ripple < 50 mVpp 20 Hz…20 MHz
Input voltage DC 48V —
Input voltage range 36…60V DC Full specified
30.5…36V DC With derating
Input current 2.75 A typ At 48V DC input
Input inrush current 0.6 A peak typ —
Efficiency 90.3% At 48V DC input
Losses 12.9 W At 48V DC input
Temperature range -25…+70 °C
(-13…+158 °F) Operational
Derating 3 W/1 °C
(3 W/1.8 °F) 60…70 °C (140…158 °F)
Hold-up time 5.6 ms typ At 48V DC input
Dimensions 32 x 124 x 102 mm
(1.26 x 4.88 x 4.02 in.) W x H x D
Weight 425 g (0.94 lb) —
Catalog Numbers Descriptions
1606-XLDF120E DC/DC Converter
1606-XLB Wall or panel mount bracket
1606-XLA-S37 Side mount bracket
1606-XLERED Redundancy module

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 7
Input Voltage
Attributes Values Notes
Input voltage Nom DC 48V —
Input voltage range
— 36.0…60.0V DC Full specified
— 30.5…36.0V DC Maximal 60 seconds or with derating see Figure 3
Max 63.0V DC Absolute max continuous input voltage with no
damage to the DC/DC converter
Allowed voltage between
input and earth Max 60V DC, or 42.2V AC In case the output voltage is not grounded
Allowed input ripple
voltage Max 5Vpp 47…500 Hz. The momentary input voltage must always be within the specified limits.
Turn-on voltage Typ 34.5V DC Steady-state value, see Figure 2
Shut-down voltage Typ 30.5V DC Steady-state value, see Figure 2
Typ 63.5V DC Steady-state value, see Figure 2
Input current Typ 2.75 A At 48V DC input and output 24V, 5 A, see Figure 5
Startup delay Typ 670 ms See Figure 4
Rise time Typ 80 ms 0 mF, 24V, constant current load 5 A, see Figure 4
Typ 150 ms 5 mF, 24V, constant current load 5 A, see Figure 4
Turn-on overshoot Max 500 mV See Figure 4
Input capacitance Typ 800 µF External capacitors on the input voltage bus are
allowed without any limitations.
Figure 2 - Input Voltage Range Figure 3 - Allowable Output Current Below 36V Input
Voltage
Turn-on
34.5V DC
V
IN
P
OUT
Shut-down
60.0V DC 30.5V DC 36.0V DC
Rated input range
63.5V DC
0
1
2
3
4
6 A
30 32 34 36 40V DC
Input Voltage
Output Current
5
38
(a)
(b)
(a) Ambient < 45 °C
(b) Ambient < 60 °C
Figure 4 - Turn-on Behavior, Definitions Figure 5 - Input Current Versus Output Load
Start-up
delay Rise Time
Overshoot
- 5%
Output
Voltage
Input
Voltage
6 A
11.5 2 3 4
0
1
2
3
4 A
5
Output Current
2.5 3.5 4.5 5.5
Input: 48V DC
Input
Current,
typ
Input: 36V DC

8Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Input Inrush Current An active inrush limitation circuit (inrush limiting resistor which is bypassed
by a relay contact) limits the input inrush current after turn-on of the input
voltage. The charging current into EMI suppression capacitors is disregarded
in the first microseconds after switch-on.
Soft Start Function After the DC/DC converter is turned on, the internal output current rises
slowly to its nominal value. This method charges the output capacitors
(internal and external capacitors) slowly and avoids high input currents
during turn-on. High input currents can produce a high voltage drop on the
input wiring (especially with long and thin cables) which reduces the terminal
voltage on the DC/DC converter. If the terminal voltage is below the shutdown
voltage, the DC/DC converter turns off and then makes a new startup attempt.
This effect is avoided with the integrated soft start function. Please note that
this function increases the rise time of the output voltage by a small amount.
Attributes Values Notes
Inrush current Max 0.8 Apeak -25…+70 °C (-13…+158 °F), input: 48V DC
Typ 0.6 Apeak -25…+70 °C (-13…+158 °F), input: 48V DC
Inrush energy Typ Negligible -25…+70 °C (-13…+158 °F), input: 48V DC
Figure 6 - Input Inrush Current, Typical Behavior
•Input:48VDC
• Output: 24V, 5 A, constant current load
• Ambient: 25 °C (77 °F)
• Input current: 1 A / DIV
• Input voltage: 50V / DIV
• Output voltage: 20V / DIV
• Time basis: 100 ms / DIV
Figure 7 - Soft Start Behavior
•Input:48VDC
• Output: 24V, 5 A, constant current load
• Ambient: 25 °C (77 °F)
• No additional external output capacitors
• Input current: 2 A / DIV
• Output voltage: 10V / DIV
• Time basis: 20 ms / DIV

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 9
Output
Peak Current Capability
The peak current capability lasts up to several milliseconds. The DC/DC
converter can deliver a peak current, which is higher than the specified
short-term current. This helps to start loads that have a high demand for
current, and operate subsequent circuit breakers safely.
The extra current is supplied by the output capacitors inside the DC/DC
converter. During this event, the capacitors are discharged and cause a voltage
dip on the output. Detailed curves can be found in Peak Current Capability on
page 20.
Attributes Values Notes
Output voltage Nom 24V —
Adjustment range Min 24…28V Extended guaranteed adjustment range down to 23V
Max 30V At clockwise end position of potentiometer
Factory setting — 24.1V ±0.2%, at full load, cold unit
Line regulation Max 25 mV Input voltage variations between 36…60V DC
Load regulation Max 100 mV Static value, 0 A 5 A
Ripple and noise voltage Max 50 mVpp 20 Hz…20 MHz, 50 Ω
Output capacitance Typ 2200 µF —
Output current
Nom 6 A At 24V, ambient < 45 °C (113 °F), see Figure 8
Nom 5 A At 24V, ambient < 60 °C (140 °F), see Figure 8
Nom 5.2 A At 28V, ambient < 45 °C (113 °F), see Figure 8
Nom 4.3 A At 28V, ambient < 60 °C (140 °F), see Figure 8
Output power Nom 144 W For ambient temperatures < 45 °C (113 °F)
Nom 120 W For ambient temperatures < 60 °C (140 °F)
Short-circuit current Min 7 A Continuous current, short circuit impedance 200 mΩ
Max 10 A Continuous current, short circuit impedance 200 mΩ
Figure 8 - Output Voltage Versus Output Current, at
48V DC Input Voltage, Typ
Figure 9 - Current Limitation Versus Input Voltage
(23V Constant Voltage Load), Typ
Output Voltage
0
048
4
8
12
28V
16
20
24
12
A
1062
Adjustment
Range
Output Current
Output Current
6.2
30 42 54
6.3
6.4
6.5
7.0 A
6.7
6.8
6.9
60V DC4836
6.6
Input Voltage
Attributes Values Notes
Peak current voltage dips
Typ 24V dips to 17.1V At 10 A for 50 ms, resistive load
Typ 24V dips to 15V At 20 A for 2 ms, resistive load
Typ 24V dips to 11V At 20 A for 5 ms, resistive load

10 Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Hold-up Time The input side of the DC/DC converter is equipped with a bulk capacitor. This
capacitor keeps the output voltage alive for a certain period of time when the
input voltage dips or is removed. The bulk capacitor can be discharged by
loading the DC/DC converter on the output side or through a load that is
parallel to the input. There is no protection in the DC/DC converter that
prevents current from flowing back to the input terminals. If the application
requires such prevention use an external diode. At no load, the hold-up time
can be up to several seconds. The green DC OK status indicator is also on
during this time.
Attributes Values Notes
Hold-up Time Typ 10.5 ms Input 48V DC, output: 24V DC, 2.5 A, see Figure 10
Typ 5.6 ms Input 48V DC, output: 24V DC, 5 A, see Figure 10
Figure 10 - Hold-up Time Versus Input Voltage Figure 11 - Shutdown Test Setup
0
2
4
6
8
12 ms
36 40 44 48 56V DC
Input Voltage
Hold-up Time
(a) 24V, 2.5 A, typ
(b) 24V, 2.5 A, min
(c) 24V, 5 A, typ
(d) 24V, 5 A, min
10
52
(a) (b)
(c) (d)
Load
+
-
DC/DC
Converter
DC
Source
+
-
Input
Output
+
-
S1
Figure 12 - Shutdown Behavior, Definitions
- 5%
Hold-up Time
Output
Voltage
Intput
Voltage
S1 opens

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 11
Efficiency and Power
Losses Attributes Values for
Input 48V DC Notes
Efficiency Typ 90.3% At 24V, 5 A
Power losses
Typ 0.9 W At no output load
Typ 6.9 W At 24V, 2.5 A
Typ 12.9 W At 24V, 5 A
Typ 16.4 W At 24V, 6 A
Figure 13 - Efficiency Versus Output Current at 24V
Output and 48V DC Input Voltage, Typ
Figure 14 - Losses Versus Output Current at 24V
Output and 48V DC Input Voltage, Typ
Eciency
1
86
88
90
85
91%
6 A245
3
87
89
Output Current
Power Losses
012 456A
0
3
9
15
18 W
6
3
12
Output Current
Figure 15 - Efficiency Versus Input Voltage at 24V, 5 A,
Typ
Figure 16 - Losses Versus Input Voltage at 24V, 5 A,
Typ
Eciency
36 40 44 52 56 60V DC
91%
88.5
89.5
90.5
90.0
89.0
88.0
48
Input Voltage
Power Losses
0
3
6
9
12
15
18 W
36 40 48 52 56 60V DC44
Input Voltage

12 Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Functional Diagram Figure 17 - Functional Diagram
Front Side and User
Elements
+
+
-
-
V
OUT
Input Fuse
&
Input Filter
Output
Voltage
Regulator
Power
Converter Output
Filter
DC
OK
Output
Over-
Voltage
Protection
Reverse
Polarity
Protection
&
Inrush
Limiter
Chassis
Ground
+
-
Over-
Temperature
Protection
Figure 18 - Front Side User Elements
1Outputterminals(screw terminals)
Dual terminals per pole, both pins are equal
+ Positive output
- Negative (return) output
2 Output voltage potentiometer
Open the flap to set the output voltage. Factory set: 24.1V
3DCOKstatusindicator(green)
On when the voltage on the output terminals is > 21V
4 Input terminals (screw terminals)
+ Positive input
- Negative (return) input
Chassis Ground: can be used to bond the Housing to PE
Ground this terminal to minimize high-frequency emissions.
1
2
3
4

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 13
Terminals and Wiring
Instructions:
• The external circuitry of all terminals must meet the safety requirements
stipulated by IEC/EN/UL 60950-1: SELV.
• Use appropriate copper cables that are designed for a minimum
operating temperature of:
- 60 °C (140 °F) for ambient up to 45 °C (113 °F)
- 75 °C (167 °F) for ambient up to 60 °C (140 °F)
• Follow national installation codes and installation regulations.
• Ensure that all strands of a stranded wire enter the terminal connection.
• Do not load the terminals with more than 25 A. See Daisy Chaining of
Outputs on page 23.
• Screws of unused terminal compartments should be securely tightened.
• Ferrules are allowed.
• Do not connect or disconnect the wires from the terminals below
-25 °C (-13 °F).
Lifetime Expectancy The lifetime expectancies the following table indicate the minimum operating
hours (service life) and are determined by the lifetime expectancy of the
built-in electrolytic capacitors. Lifetime expectancy is specified in operational
hours and is calculated according to the manufacturer specification of the
capacitor. The prediction model allows a calculation of up to 15 years (131,400
hr) from date of shipment.
Attributes Values
Input Output
Type Screw terminals Screw terminals
Solid wire 6 mm2max 6 mm2max
Stranded wire 4 mm2max 4 mm2max
American Wire Gauge 20…10 AWG 20…10 AWG
Wire stripping length 7 mm (0.28 in.) 7 mm (0.28 in.)
Screwdriver 3.5 mm (0.138 in.) slotted
or Pozidrive No 2 3.5 mm (0.138 in.) slotted or Pozidrive No 2
Recommended
tightening torque 1 N•m (9 lb•in) 1 N•m (9 lb•in)
Attribute Values for
Input 48V DC Notes
Lifetime expectancy
169,000 hr At 24V, 2.5 A and 40 °C (104 °F)
64,000 hr At 24V, 5 A and 40 °C (104 °F)
39,000 hr At 24V, 6 A and 40 °C (104 °F)
181,000 hr At 24V, 5 A and 25 °C (77 °F)

14 Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Mean Time Between Failure Mean Time Between Failure (MTBF) 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. An MTBF value of, for example, 1,000,000 hr
means that statistically one unit fails every 100 hours if 10,000 units are
installed in the field. However, it cannot be determined if the failed unit has
been running for 50,000 hr or only for 100 hr.
Electromagnetic
Compatibility
The DC/DC converter is suitable for applications in industrial, residential,
commercial, and light industrial environments without any restrictions.
Attribute Values for
Input 48V DC Notes
MTBF SN 29500, IEC 61709 951,000 hr At 24V, 5 A and 40 °C (104 °F)
1 560,000 hr At 24V, 5 A and 25 °C (77 °F)
MTBF MIL HDBK 217F 559,000 hr At 24V, 5 A and 40 °C (104 °F); Ground Benign GB40
749,000 hr At 24V, 5 A and 25 °C (77 °F); Ground Benign GB25
EMC Immunity According to Generic standards EN 61000-6-1 and EN 61000-6-2
Attributes Standards Values Criteria(1)
(1) Criterion A: DC/DC converter shows normal operation behavior within the defined limits.
Electrostatic discharge EN 61000-4-2 Contact discharge 8 kV Criterion A
Air discharge 15 kV Criterion A
Electromagnetic RF field EN 61000-4-3 80 MHz…2.7 GHz 10V/m Criterion A
Fast transients (Burst) EN 61000-4-4 Input lines 4 kV Criterion A
Output lines 2 kV Criterion A
Surge voltage on input EN 61000-4-5 + -1kVCriterionA
+/- chassis ground 2 kV Criterion A
Surge voltage on output EN 61000-4-5 + - 500V Criterion A
+ / -  chassis ground 1 kV Criterion A
Conducted disturbance EN 61000-4-6 0.15…80 MHz 10V Criterion A
EMC Emission According to Generic standards: EN 61000-6-3 and EN 61000-6-4
Attributes Standards Notes
Conducted emission on input IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 Limits for DC power ports according to EN 61000-6-3
fulfilled
Radiated emission EN 55011, EN 55022 Class B
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 Frequency
Attribute Values Notes
Main converter 90...140 kHz Dependent on output load and input
voltage (output current > 0.5 A)

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 15
Environment
Attributes Values Notes
Operational temperature(1)
(1) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2 cm (0.79 in.)
below the unit.
-25…+70 °C (-13…+158 °F) Reduce output power according to Figure 19
Storage temperature -40…+85 °C (-40…+185 °F) For storage and transportation
Output derating 1.6 W/1 °C (1.6 W/1.8 °F) Between 45…60 °C (113…140 °F)
3 W/1 °C (3 W/1.8 °F) Between 60…70 °C (140…158 °F)
Humidity(2)
(2) Do not energize while condensation is present.
5…95% r.H. IEC 60068-2-30
Vibration sinusoidal(3)
(3) Tested in combination with DIN rails according to EN 60715 with a height of 15 mm (0.59 in.) and a thickness of 1.3 mm
(0.05 in.) and standard orientation.
2…17.8 Hz: ±1.6 mm (0.063 in.)
17.8…500 Hz: 2 g
2 hours / axis IEC 60068-2-6
Shock 30 g 6 ms, 20 g 11 ms 3 bumps / direction,
18 bumps in total IEC 60068-2-27
Altitude 0…6000 m (0…20,000 ft) Reduce output power or ambient temperature in
applications 2000 m (6500 ft) above sea level
Altitude derating 7.5 W/1000 m (7.5 W/3280 ft), or
5 °C/1000 m (9 °F/3280 ft) Above 2000 m (6500 ft), see Figure 20
Overvoltage category III IEC 62477-1, EN 50178, altitudes up to 2000 m (6500 ft)
II Altitudes from 2000…6000 m (6500…20,000 ft)
Degree of pollution 2 IEC 62477-1, EN 50178, not conductive
LABS compatibility The unit does not release any silicone or other LABS-critical substances and is suitable for use
in paint shops.
Figure 19 - Output Current Versus Ambient Temp. Figure 20 - Output Current Versus Altitude at 24V
0
-25 0 20 40 70 °
C
1
2
3
4
5
6 A
60
Ambient Temperature
continuous
short
term
Allowable Output
Current at 24V
0
020004000
6000 m
1
2
3
4
5
6 A
Altitude
A: Tamb < 60 °C
B: Tamb < 50 °C
C: Tamb < 40 °C
C
B
A
short term
Allowable Output
Current at 24V

16 Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Protection Features
Safety Features The input must be powered from a SELV source (according to IEC 60950-1), a
PELV source (according to IEC 62477-1), or an Isolated Secondary Circuit
(according to UL 508). If these input requirements are met, the following
safety features apply.
Dielectric Strength The output voltage is floating and has no ohmic connection to the ground. The
manufacturer conducts type and factory tests. Field tests can be conducted in
the field using the appropriate test equipment, which applies the voltage with
a slow ramp (2 s up and 2 s down). Connect all input terminals together, and all
output poles before conducting the test. When testing, set the cutoff current
settings to the values in the following table.
Attributes Values Notes
Output protection Electronically protected against overload, no-load, and short-circuits(1)
(1) If there is a protection event, audible noise may occur.
Output overvoltage
protection 31V DC typ 32V DC max
If there is an internal DC/DC converter anomaly, a redundant
circuit limits the maximum output voltage. The output shuts
down and automatically attempts to restart.
Reverse input polarity
protection Included Unit does not start when input voltage is reversed
Output overcurrent
protection Electronically limited(1) See Figure 8 on page 9
Degree of protection IP 20 EN/IEC 60529
Penetration protection > 3.5 mm (0.138 in.) For example, screws, small parts
Over-temperature
protection Yes Output shutdown with automatic restart
Input transient protection MOV Metal Oxide Varistor
Internal input fuse Included Not user-replaceable
Attributes Values Notes
Classification of output
voltage
SELV IEC/EN 60950-1
PELV IEC/EN 60204-1, EN 50178, IEC 62477-1, IEC 60364-4-41
Class of protection III PE (Protective Earth) connection not required. A connection of the
“Chassis Ground” pin to earth is recommended for best EMI performance
Isolation resistance > 5 MΩ Input to output, 500V DC
PE resistance < 0.1 Ω Between housing and Chassis Ground terminal
Touch current
(leakage current)
The leakage current that is produced by the DC/DC converter itself depends on the
input voltage ripple and must be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100 µA.
Figure 21 - Dielectric Strength Test or Setting Time A B C
Type test 60 s 1500V AC 1500V AC 500V AC
Factory test 5 s 1500V AC 1500V AC 500V AC
Field test 5 s 1000V AC 1000V AC 500V AC
Cutoff current
setting — > 30 mA > 30 mA > 12 mA
To fulfill the PELV requirements according
to EN60204-1 § 6.4.1, we recommend that
you connect the protective earth system to
the + pole, the – pole, or any other part of
the output circuit. This helps to avoid
situations in which a load starts
unexpectedly or cannot be switched off
when unnoticed earth faults occur.
A
C
B
+
Input
Chassis
ground
Output
-
+
-

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 17
Approvals
Fulfilled Standards
Approval Names Approval Symbols Notes
EC Declaration of Conformity The CE marking indicates conformance with the following: –EMCDirective
– ATEX directive
IEC 60950-1
2nd Edition CB Scheme, Information Technology Equipment
UL 508 LISTED for use as Industrial Control Equipment; U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E56639
UL 60950-1 RECOGNIZED for the use as Information Technology Equipment, Level 3; U.S.A. (UL 60950-1) and Canada (C22.2
No. 60950-1); E-File: E168663
EN 60079-0, EN 60079-7
ATEX
Approval for use in hazardous locations Zone 2 Category 3G.
Number of ATEX certificate: EPS 08 ATEX 1 142 X
The device must be built-in, in an IP54 enclosure.
IEC 60079-0, IEC 60079-7 Suitable for use in Class 1 Zone 2 Groups IIa, IIb, and IIc
locations. Number of IECEx certificate: IECEx EPS 14.0001X
ANSI / ISA 12.12.01-2007
Class I Div 2
Recognized for use in Hazardous Location Class I Div 2 T4
Groups A,B,C,D systems; U.S.A. (ANSI / ISA 12.12.01) and
Canada (C22.2 No. 213-M1987)
Marine
GL (Germanischer Lloyd) classified and
ABS (American Bureau for Shipping) PDA
Environmental category: C, EMC2
Marine and offshore applications
EAC TR Registration Registration for the Eurasian Customs Union market (Russia,
Kazakhstan, Belarus)
IND. CONT. EQ.
II 3G Ex ec nC II T 4 Gc
IECEx
Standard Names Standard Symbols Notes
RoHS Directive Directive 2011/65/EU of the European Parliament and the Council of June 8, 2011 on the restriction of the use of certain hazardous
substances in electrical and electronic equipment.
REACH Directive Directive 1907/2006/EU of the European Parliament and the Council of June 1, 2007 regarding the Registration, Evaluation,
Authorization, and Restriction of Chemicals (REACH)

18 Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
Physical Dimensions and
Weight
The dimensions in the following figures are in millimeters.
Attributes Values and Descriptions
Width 32 mm (1.26 in.)
Height 124 mm (4.88 in.)
Depth 102 mm (4.02 in.)
Weight 425 g (0.94 lb)
DIN rail Use 35 mm (1.38 in.) DIN rails according to EN 60715 or EN 50022 with a height of 7.5 mm (0.30 in.) or 15 mm (0.59 in.). The DIN rail height must be added to the unit
depth to calculate the total required installation depth.
Installation
clearances
Keep the following installation clearances:
• 40 mm (1.57 in.) on top
• 20 mm (0.79 in.) on the bottom
• 5 mm (0.20 in.) on the left side and 5 mm (0.20 in.) on the right side are
recommended when the device is loaded permanently with more than 50% of
the rated power. If the adjacent device is a heat source, such as another DC/DC
converter, increase the side clearances from 5 mm (0.20 in.) to 15 mm (0.59 in.).
Figure 22 - Front View Figure 23 - Side View

Rockwell Automation Publication 1606-RM114A-EN-P - September 2020 19
Accessories This section provides information about devices that can be used with the
1606-XLDF120E DC/DC converter.
1606-XLB Wall Mounting Bracket
This bracket is used to mount the DC/DC converter onto a flat surface without
using a DIN rail. The two aluminum brackets and the black plastic slider of the
unit have to be removed, so that the two steel brackets can be mounted.
1606-XLA-S37 Side Mount Bracket
This bracket is used to mount the DC/DC converter sideways with or without a
DIN rail. The two aluminum brackets and the black plastic slider of the unit
have to be detached, so that the steel brackets can be mounted. For sideways
DIN rail mounting, the removed aluminum brackets and the black plastic
slider must be mounted on the steel bracket.
Figure 24 - Wall Mounting Bracket
Attached to DC/DC Converter(1)
(1) The drawing of the DC/DC converter is only intended to show mounting functionality.
Figure 25 - Wall Mounting Bracket
Figure 26 - Side Mounting
Without DIN Rail Brackets(1)
(1) The drawings of the DC/DC converter are only intended to show mounting functionality.
Figure 27 - Side Mounting With
DIN Rail Brackets(1)

20 Rockwell Automation Publication 1606-RM114A-EN-P - September 2020
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. If there is a
short or an overload in the branch circuit, the fuse needs a certain amount of
overcurrent to trip or to blow. The peak current capability helps ensure the safe
operation of subsequent circuit breakers.
If the input voltage is turned on before such an event, the built-in large sized
output capacitors inside the DC/DC converter can deliver extra current.
Discharging this capacitor causes a voltage dip on the output. The following
two examples show typical voltage dips:
Back-feeding Loads Loads such as decelerating motors and inductors can feed voltage back to the
DC/DC converter. This feature is also called return voltage immunity or
resistance against Back Electromagnetic Force (Back EMF).
This DC/DC converter 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 maximum allowed feedback-voltage is 30V DC. The absorbing energy can
be calculated according to the built-in large sized output capacitance, which is
specified in Output on page 9.
Figure 28 - Peak Loading with 2x the Nominal
Current for 50 ms, Typ
Figure 29 - Peak Loading with 4x the Nominal
Current for 5 ms, Typ
Peak load 10 A (resistive load) for 50 ms
Output voltage: 24V dips to 17.1V.
Peak load 20 A (resistive load) for 5 ms
Output voltage: 24V dips to 11V.