What to Look for
When Choosing a
Power Supply

www.asi-ez.com

877-650-5160

Automation Systems
Interconnect

Safety, reli...
One of the most
fundamental and
often overlooked
purposes of a power
supply is to provide
isolation and
therefore safety f...
Reliability
Q: What Affects the Reliability
of a Power Supply?
A: - Average load rate
- Vibration
- Ambient
Temperature
ww...
Key issue is the amount of
heat generated by the
internal components
ASI Power Supply
Designed with
Excellent
Ventilation ...
Mean Time Between Failure
(MTBF)
some manufacturers have developed
their own proprietary calculations for
MTBF that produc...
key
performance
element of a
power supply
is its power
factor

Power Factor Correction

www.asi-ez.com

877-650-5160

6
Power
Factor
Correction

There are two primary methods of power
factor correction (PFC). The first method
is the use of a ...
Power
Factor
Correction

“Active” PFC
Active PFC can produce a power factor
greater than 95% and is most useful in
larger ...
Power
Factor
Correction

Look for the power supply to
also meet the EN 55011-B
and EN55022-B specification
for electrical ...
Surge
Protection

This built-in feature
(up to 4 kV of protection)
saves valuable panel space
by not requiring an
external...
A good power supply is
one that offers a
minimum of 5%, and
ideally 10% of overload
protection
.

www.asi-ez.com

877-650-...
Short-circuit protection:
- For Safety Purposes
- Saves time in powering
up after a short circuit
has been detected

www.a...
Agency Approvals

UL, CSA, and CE
compliance marks are
evidence of passing
several safety and
electrical emissions
require...
Agency Approvals
The UL 508 listing offers the additional
benefit of not requiring a power supply
rated for twice the inte...
Contact ASI
For More
Power Supply Information:

asi-ez.com
877-650-5160
sales@asi-ez.com
www.asi-ez.com

877-650-5160

15
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How to select a DIN rail power supply

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www.asi-ez.com Selecting a DIN Rail mounted Power Supply can be tough. In this presentation,you will find suggestions on what to look for when selecting a power supply for your application.

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How to select a DIN rail power supply

  1. 1. What to Look for When Choosing a Power Supply www.asi-ez.com 877-650-5160 Automation Systems Interconnect Safety, reliability, and power factor correction are among the prime considerations 1
  2. 2. One of the most fundamental and often overlooked purposes of a power supply is to provide isolation and therefore safety from a high-voltage (or dangerous) supply line Safety First www.asi-ez.com 877-650-5160 2
  3. 3. Reliability Q: What Affects the Reliability of a Power Supply? A: - Average load rate - Vibration - Ambient Temperature www.asi-ez.com 877-650-5160 3
  4. 4. Key issue is the amount of heat generated by the internal components ASI Power Supply Designed with Excellent Ventilation to Avoid Overheating www.asi-ez.com 877-650-5160 4
  5. 5. Mean Time Between Failure (MTBF) some manufacturers have developed their own proprietary calculations for MTBF that produce higher values, it is best to compare only using the MTBF as defined in MIL-HDBK-217E www.asi-ez.com 877-650-5160 5
  6. 6. key performance element of a power supply is its power factor Power Factor Correction www.asi-ez.com 877-650-5160 6
  7. 7. Power Factor Correction There are two primary methods of power factor correction (PFC). The first method is the use of a simple coil at the input, and the second involves the use of a special electronic power-factor-correction circuit. The use of the coil is referred to as "passive" PFC and it typically produces a power factor of 0.7 to 0.8. The best use of the available energy with the least amount of conducted harmonics can be achieved with "active" PFC. www.asi-ez.com 877-650-5160 7
  8. 8. Power Factor Correction “Active” PFC Active PFC can produce a power factor greater than 95% and is most useful in larger power supplies, 24 Vdc at 10 A and higher, since the conducted harmonics are directly proportional to the current load. www.asi-ez.com 877-650-5160 8
  9. 9. Power Factor Correction Look for the power supply to also meet the EN 55011-B and EN55022-B specification for electrical emissions and EN 61000.3.2 regarding harmonic emissions conducted back on the main input lines. www.asi-ez.com 877-650-5160 9
  10. 10. Surge Protection This built-in feature (up to 4 kV of protection) saves valuable panel space by not requiring an external suppressor www.asi-ez.com 877-650-5160 10
  11. 11. A good power supply is one that offers a minimum of 5%, and ideally 10% of overload protection . www.asi-ez.com 877-650-5160 11
  12. 12. Short-circuit protection: - For Safety Purposes - Saves time in powering up after a short circuit has been detected www.asi-ez.com 877-650-5160 12
  13. 13. Agency Approvals UL, CSA, and CE compliance marks are evidence of passing several safety and electrical emissions requirements www.asi-ez.com 877-650-5160 13
  14. 14. Agency Approvals The UL 508 listing offers the additional benefit of not requiring a power supply rated for twice the intended use. Without UL 508, the power supply must be derated by 50% in order for the control cabinet to also be UL 508 compliant. www.asi-ez.com 877-650-5160 14
  15. 15. Contact ASI For More Power Supply Information: asi-ez.com 877-650-5160 sales@asi-ez.com www.asi-ez.com 877-650-5160 15
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