Dycon EN54-Certified 24V 5A Power Supply Unit - Up to 17Ah Batteries (D2435-17)

The Dycon D2435-17 is a 5A, 24VDC switched-mode power supply for fire alarm systems, certified to EN 54-4 and the Construction Products Regulation. It supplies a nominal 27VDC and uses two separate 12V sealed lead-acid batteries (2 x 17Ah, not included) for standby when mains power is lost. The housing has space for both batteries.

Key features

• Certified to EN 54-4 and the Construction Products Regulation (CPR)
• Microprocessor monitored and controlled
• On-demand load sharing: spare output capacity is diverted to rapid battery charging
• Each 12V battery connected separately so its performance can be checked individually
• Constant battery impedance monitoring gives early warning of battery deterioration
• On-board or remote temperature sensing adjusts the charging rate (optional remote sensor D-TEMP-01)
• 3 opto-relay fault outputs: AC power fail, battery fault and PSU fault
• 2 independent, electronically fused, switched 24VDC outputs; automatic reconnection after a short circuit
• Over-voltage output protection; no user-serviceable fuses
• 1 external and 3 internal status LEDs
• UK-manufactured electronics and steel housing

Technical specifications

• Part number: D2435-17
• CPR number: 0359-CPR-00434
• Certification: EN 54-4:1997+A1:2002+A2:2006
• Input voltage: 230VAC +10% −15%, 50Hz ±15%
• Maximum AC input current: 1.5A
• Output voltage (mains): 26VDC minimum, 29.5VDC maximum
• Maximum output current: 5A
• Output ripple: <0.07V peak-to-peak at full rated output
• Battery charging: 27.6VDC, on-demand up to 5A
• Batteries required: 2 x 12VDC 17Ah, sealed lead-acid
• Standby output voltage: 21VDC minimum, 27.6VDC maximum
• PSU standby current: 32mA
• Over-voltage cut-out: 30VDC ±2%
• Low-voltage output fault: <22VDC ±2% (restores at >23VDC ±2%)
• Battery deep discharge limit: 21VDC ±2%
• Battery fuse: 6A PTC, non-replaceable
• Fault opto-relays: 3 x NC (or NO by jumper), 100mA at 60V, 16 ohms max ON-resistance, 1500VRMS isolation
• Operating temperature: −10°C to +40°C
• Humidity: 95% non-condensing
• Housing: large steel housing, 394 x 379 x 90 mm (H x W x D)