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SDN™ Series Redundant Options
The SDN Series standard options allow for operation in a
wide variety of applications. With the addition of an exter-
nal redundancy module, the SDN can also be used for true
redundant operation including 2N and N+x congurations.
All SDN units include built in current sharing for parallel and
redundant operation. All models ending in P also include
a DC OK status relay contact. The external modules
SDN 2.5-20RED and SDN 30/40RED increase the reliability
by isolating the supplies and adding more signal options.
Paralleling for increased power does not require the use of
these modules.
Module Compatibility
Two separate modules are available to provide the maximum
exibility in size, cost and signaling capability. Refer to the
chart below for information on which module can be used for
each SDN power supply.
Power Rating – A simple Yes or No indication that this module
can or cannot handle the power rating of that power supply.
Input/Output Signals – Yes indicates that each power supply
would have an independent relay contact to provide power
supply status, and the DC bus output from the redundant
module has it’s own DC OK relay contact. Output only
indicates that only the output of the redundant module
would have a DC OK relay contact.
Features
• DC OK Relay Contact
• True Isolation
• High availability
• SDN features and quality
EMC and
Low Volt.
Directive
Related Products
• SDN™ Series
• SFL Series
Applications
• Process Control
• Remote Location
• Critical Production
Redundancy Module Compatibility Chart
Single Phase SDN Series
SDN 2.5-24-100P* SDN 4-24-100P* SDN 5-24-100P SDN 10-24-100P SDN 20-24-100P
SDN 2.5-20RED Power Rating Yes Yes Yes Yes Yes
Input / Output Signals Yes Yes Yes Yes Yes
SDN 30/40RED Power Rating Yes Yes Yes Yes Yes
Input / Output Signals Yes Yes Yes Yes Yes
Three Phase SDN Series
SDN 5-24-480 SDN 10-24-480 SDN 20-24-480 SDN 30-24-480 SDN 40-24-480
SDN 2.5-20RED Power Rating Yes Yes Yes No No
Input / Output Signals Output Only Output Only Output Only N/A N/A
SDN 30/40RED Power Rating Yes Yes Yes Yes Yes
Input / Output Signals Yes Yes Yes Yes Yes
* Paralleling will violate Class 2 current limits.
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Power Supplies
SDN™ Redundant Series Specifications for SDN2.5-20RED and SDN 30/40RED
Catalog Number
Description SDN 2.5-20RED SDN 30/40RED
Concept
By means of a separate redundancy module, you can interconnect several identical SDN power supply units in a N+1 redundant mode. These external
modules decouple the power supply outputs from each other so that, in case of failure, one power supply unit cannot overload the other units. The
modules incorporate DC OK relay contacts. The switch on front of the SDN power supply should be placed in parallel mode (not single mode) when
power supplies are used with redundant module.
Electrical Characteristics
Voltage
-Nominal Value 24 Vdc
-Max. Rated 35 V
Voltage Drop
-Vin -> Vout Typ. 0.6 V
Current Handling Capacity
-Maximum Value 20 A 40 A
Inverse Battery Protection Yes
Connection Via captive screw terminals
-Connector size range
Solid: 16-10 AWG (1.5 - 6 mm2)
Stranded: 16-12 AWG (1.5 - 4 mm2)
Solid: 16-5 AWG (1.5 - 16 mm2)
Stranded: 16-8 AWG (1.5 - 10 mm2)
Note: GND must be connected to module for voltage monitor to operate properly.
See Connectors and Wiring diagrams on next page.
Relay Contacts
DC Okay Contacts (qty) description (1) Vout “OK” - N.O. & N.C. Contact (1) Vout “OK” - N.O. Contact
(2) Vin “OK” - N.O. Contact
-Voltage Set Point > 18 Vdc ±5%
-Contact Rating 30 Vdc @ 2A / 250 V @ 2A
DC OK LED Vout “OK” Green LED
-Voltage Set Point > 18 Vdc ±5%
Dimensions
H x W x D - inches (mm) 4.88 in x 1.97 in x 4.55 in
(124 mm x 50 mm x 116 mm)
4.88 in x 2.56 in x 4.55 in
(124 mm x 65 mm x 116 mm)
Free Space for Ventilation -
inches (mm)
Above/Below: 0.39 in. (10 mm) recommended
Left/Right: 0.39 in. (10 mm) recommended
Weight lbs (kg) 1.38 (625) 1.43 (646)
General
Ambient Temperature
Storage: -25°C...+85°C Operation: -10°C...+60°C full power with operation to 70°C possible with a
linear derating to half power from 60°C to 70°C (Convection cooling, no forced air required). Operation up
to 50% load permissible with sideways or front side up mounting orientation. The relative humidity is
< 90% RH, noncondensing.
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Power Supplies
Wiring Diagram for SDN 2.5-20RED
Single
Parallel
Single
Parallel
Notes:
1. The Common (marked “COM -“) connection to the module is required for voltage monitoring (DC OK Contacts), and is not meant to be
part of the current path from the power supply to the load.
2. Protective earth connection only provides protective ground to the metal case of the module. This connection is isolated from the
positive and common connections.
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Power Supplies
Wiring Diagram for SDN 30/40RED
Notes:
1. The Common (marked “COM -“) connection to the module is required for voltage monitoring (DC OK Contacts), and is not meant to be
part of the current path from the power supply to the load.
2. Protective earth connection only provides protective ground to the metal case of the module. This connection is isolated from the
positive and common connections.
Single
Parallel
Single
Parallel
