Information needed to specify the correct Dycon power supply

  1. What input voltage is needed? 230VAC or 110VAC
  2. What Output Voltage is needed? 5VDC or 12VDC or 15VAC or 24VDC or 48VDC or 24VAC
  3. What is the maximum output current or wattage required?
  4. Do you need battery back-up YES/NO? If YES what duration in hours?
  5. Do you need fault outputs YES/NO? If YES  which? Mains lost? PSU fault? low battery? Do you want a single opto-relay for all faults or 3 separate fault relays?
  6. Do you need a switchable output, i.e. an input that will stop the output voltage when triggered?
  7. Do you need compliance with any standard? i.e EN50131 or EN54-4?
  8. What size housing do you need or do you just want a PCB
  9. What add-on accessory options do you need? Anti-tamper switches, DIN-rail, output splitters, fire relays, or Universal relay output modules
  10. How many units do you need?


You now have ten metal housings, what are their dimensions?

  • 'AA' size = 110mm (wide) x 178mm (high) x 68mm (deep)   1.09kg (weight)
  • ‘A’ size   = 235mm (wide) x 170mm (high)  x 85mm (deep)  2.0kg (weight)
  • ‘B’ size   = 260mm (wide) x 320mm (high) x 90mm (deep)  3.5kg (weight)
  • 'XLB'     = 295mm (wide) x 415mm (high)  x 90mm (deep)  2.2kg (weight)
  • 'XLBD'  = 295mm (wide) x 415mm (high)  x 165mm (deep)  4.4kg (weight)
  • ‘C’ size   = 345mm (wide) x 430mm (high) x 90mm (deep)  4.5kg (weight)
  • 'E' size  = 405mm (wide) x 500mm (high) x 90mm (deep)   5.3kg (weight)
  • 'G' size  = 455mm (wide) x 690mm (high) x 116mm (deep)   7.7kg (weight)
  • EN-M7 = 294mm (wide) x 330mm (high) x  90mm (deep)   2.5kg (weight)
  • EN-L17 = 379mm (wide) x 395mm(high)  x  90mm (deep)   3.5kg (weight)

The 'XLBD', 'E', and 'G' size boxes are designed to be used in projects where additional space is required for 3rd Party modules, additional batteries or extra cabling. 

The EN-M7 and EN-L17 housings  also comply with EN54-4 for use in fire alarm systems

You also have two IP66 and an IP65 housings , what are their dimensions?

  • Small IP66 = 180mm (high) x 180mm (wide) x 90mm (deep) 0.3kg (weight)
  • Large IP66 = 254mm (high) x 180mm (wide) x 90mm (deep) 0.6kg (weight)
  • Medium IP65 = 240mm (high) x 190mm (wide) x 90mm (deep) 0.6kg (weight)

How many batteries can each housing accommodate?

  • Small size - ‘ A’ box 
    • 1 x 7/8Ah                                                             
  • ‘Medium size - 'B’ box
    • 3 x 7/8Ah (if 3 x 7Ah batteries are fitted there is no additional room left in the housing to fit any other device)          
    • or  1 x 17/18Ah  
  • Medium size - 'XLB' box
    • 3 x 7/8Ah  or 2 x 17/18Ah                                            
  • Large size -  ‘C’ box
    • 2 x 17/18Ah 
  • Extra Large size - ‘E’ & 'G' 
    • Depends on the type of PSU module fitted, please call for further information.                                                          
  • Medium size IP65 -  'W' box  
    • 1 x 7/8Ah
  • Small size IP66 - box
    • 1 x 7/8Ah                                                      
  • Large IP66 - box
    • 2 x 7/8Ah

What are the relays marked EPS and APS?

These relays are provided to enable external monitoring of the External Power Supply, i.e. mains power (EPS) and the Auxiliary Power Supply, i.e. the units output (APS).

What is the current rating of the Fault relay? Is it OC (open collector), volt-free etc.?

These are voltage-free relay outputs.

Is the battery short-circuit protected?

The battery/batteries and all electronic circuitry are protected against short-circuits and reverse polarity connection by self resetting electronic fuses. The batteries are also protected against deep discharge which will automatically be invoked when the battery terminal voltage has dropped to 10.5v

Why can I measure AC voltage (80v) between the Earth terminal and the –ve Terminal?

Part of the requisite EMC protection in this type of circuit to comply with the EN60950 Electrical Safety Standard uses a capacitor, this is the source of the voltage . It is perfectly safe as the current is extremely low.

Which Dycon power supplies have battery back-up?

All have battery back with the exception of the following ranges:-

  • D1573, D1575 12VDCunits
  • D1410  HiPower 12VDC units
  • D2401/2/3/5 24VDC units
  • D2904 24VAC unit
  • DR-60-12 12VDC integrated DIN-Rail mounted unit
  • DR-60-24 24VDC integrated DIN-Rail mounted unit
  • HS-600-12 12VDC High-Power (50A) unit
  • HS-600-24 24VDC High-P0wer (25A) unit

Why do you say that switched-mode units are better for access control systems than conventional linear units?

Dycon Power Solutions products are used extensively in the Access Control industry to reliably power locks, door-strikes, magnetic releases and controllers. All have built-in “Inductive Kickback Protection” which ensures they will operate correctly with electric lock solenoids, motors and high power magnetic releases

Do your products conform to the current safety standards?

Yes! Dycon Power Solutions products meet EN55022-2010 (conducted emissions) and EN 61204-3 (radiated emissions).

It should be noted that the permitted emission and noise levels in the ENs are lower than for the corresponding UL standards.

Do switched-mode units emit HF noise on their outputs?

All our switch mode power supplies have high frequency filtering on the output. This is to ensure our products meet EN55022-2010 (conducted emissions) and EN 61204-3 (radiated emissions).
Whilst it may well be true that cheap Far Eastern PSUs do not have the requisite filtering, all our products do.

Aren’t Dycon Power Solutions switched-mode units are affected by highly inductive loads?

Switch Mode Power Supplies will “switch off” when handling highly inductive loads. Excessive current draw (over 150% of the stated maximum load) will shut the switcher down (for safety) As Dycon Power Solutions Switchers are all battery backed up, the output will NOT switch off unless the current draw from the powered device exceeds the fuse rating of the output to the load. The fuses are electronic fuses and automatically reset when the overload is removed