Elmdene 7422-sfg-g3f - Manual _verified_

Comprehensive Technical Manual for the Elmdene 7422-SFG-G3F

Chapter 8: Frequently Asked Questions (Manual Clarifications)

Q: Can I use this with a 12Ah battery? A (from manual): Yes, but only if the load is <2A average. The charge current (0.5A) will take over 24 hours to recharge a 12Ah battery. Also, the enclosure does not physically fit a 12Ah – you’d need an external battery box (EN 60950-1 compliant).

Q: Why is this called a “linear” supply? A: Unlike switch-mode supplies, linear units use a heavy iron transformer. The manual notes that linear supplies produce less electrical noise, making them superior for fire alarms and analogue access control readers. elmdene 7422-sfg-g3f manual

Q: Is the Elmdene 7422-SFG-G3F compliant with the latest fire standards? A: Yes – it is certified to EN 62368-1 (the successor to EN 60950-1). For fire alarm use, you must enable the “Fire Override” input as detailed in Appendix A of the manual. Mains Terminal Block (L, N, E): Screened with

Chapter 2: Unboxing and Physical Layout

The manual provides a detailed mechanical diagram. Here’s what you’ll find inside the steel enclosure: FS1 (Primary): Mains side

1. Mains Terminal Block (L, N, E): Screened with a clear plastic guard for safety.
2. Transformer: A heavy-duty toroidal or laminated transformer (linear, not switch-mode, hence the weight).
3. PCB (Rev G3): Fibreglass board with plated-through holes.
4. Fuse Holders:
   • FS1 (Primary): Mains side.
   • FS2 (Output): DC output to load.
   • FS3 (Battery): Battery charge/discharge path.
5. Battery Connection Leads: Red/Black flying leads (ring crimps).
6. DC Output Terminals: Marked +V (13.8V) and 0V.
7. Low Voltage Disconnect (LVD) Jumper: A critical jump link (more on this below).

7. Wiring Examples

10. Maintenance & Safety

• Periodic testing: Every 6 months, simulate input activation and verify output operation.
• Cleaning: Use dry anti-static cloth. Do not use solvents.
• Disposal: WEEE Directive compliant – recycle at authorised e-waste facility. Do not incinerate.
• Safety warning: Installation must be carried out by competent personnel only. Isolate power before opening the unit.

Key Technical Specifications (At a Glance)

Before diving into the manual details, it is critical to understand the unit's limits. Note: Always verify with the official datasheet, but the following are standard for this model range.

| Parameter | Specification | | :--- | :--- | | Input Voltage | 230V AC ±10%, 50/60Hz | | Output Voltage | 13.8V DC (nominal, regulated) | | Output Current | 2.5A continuous (3.5A peak) | | Battery Charging | 12V Sealed Lead Acid (7Ah or 12Ah typical) | | Battery Charge Current | 0.5A (constant current/constant voltage) | | Fault Relay Output | Volt-free changeover contacts (30V DC, 1A max) | | Operating Temperature | -10°C to +50°C | | Enclosure Rating | IP30 (Indoor use only) | | Terminal Type | Rising clamp screw terminals |

11. Ordering Information

• Model: 7422-SFG-G3F (standard)
• Accessories:
  • 7422-SFG-G3F-PSU (includes 24V DC 500mA PSU module)
  • EOL-RES-KIT (assorted resistors for monitoring)
  • REM-RES-BTN (external reset pushbutton station)

Problem 1: No DC Output (System Dead)

Symptoms: LEDs AC OK is ON, but DC OK is OFF. Solution:

1. Disconnect the load (security panel).
2. Measure voltage at the 0V/+12V terminals. If voltage returns (13.8V), the load had a short circuit.
3. If still 0V, the PSU is likely in "Hiccup mode" due to internal failure. Replace the unit.