Product Introduce
LME22.331C2 is an intermittent operation safety controller suitable for single/double-stage gas burners with small and medium capacity (≤350kW). The core is used for burner start and stop, flame monitoring and fault protection.
Parameter
| Parameter | Value |
|---|---|
| Supply Voltage | AC 230V, 50/60Hz |
| Power Consumption | ~3.5VA |
| Flame Supervision | Ionization probe / QRA/QRC flame detector |
| Protection Functions | Undervoltage detection, air pressure monitoring, limited restart cycles |
| Ambient Temp | -20°C to +60°C |
| Key Compliance | EN298 (combustion control), EN676 (forced draught burners) |
| Connection | Plug‑in base (standard LME mounting) |
Function
- Sequence Control: Automatically executes the complete process of pre-purge → ignition → flame detection → combustion → post-purge → shutdown. The dual-stage type supports high and low fire switching.
- Flame Safeguard: When ignition fails or flameout occurs during operation, the gas will be cut off immediately and the alarm will be locked, supporting remote reset.
- Safety Interlocks: Integrated air pressure switch, gas pressure monitoring, under-pressure detection, etc., and any interlock is triggered to cause shutdown protection.
- Status Indication: Multi-color indicator lights display operating/fault status for quick diagnosis.
FAQ:
1.What are the core conditions for triggering safety interlock shutdown of LME22.331C2?
| Core Interlock Condition | Trigger Mechanism | Protection Action |
|---|---|---|
| Flame failure (ignition or operation) | Ionization probe/QRA/QRC detector no flame signal; ignition window timeout (typically ~5s) | Cut off gas valve, lock alarm |
| Air pressure loss/interlock | Air pressure switch contact open (pre‑purge/operation phase) | Stop sequence, gas valve closed |
| Undervoltage/overvoltage | Supply voltage <180V AC or >260V AC (230V nominal) | Immediate shutdown, lockout |
| Emergency stop (E‑stop) | E‑stop button pressed, signal to controller safety input | Abort all sequences, gas isolation |
| Gas pressure anomaly | Gas pressure switch open (low/high limit triggered) | Shutdown before/after ignition |
| Exceeded restart cycles | >3 automatic restart attempts in a cycle | Lockout, require manual reset |
| Flame monitoring circuit fault | Open/short in ionization/flame detector wiring | Shutdown, fault indication |
| Pre‑purge/post‑purge timeout | Pre‑purge <10s (adjustable) or post‑purge incomplete | Stop ignition, gas valve closed |
2.What is the allowable fluctuation range of the AC 230V power supply voltage of LME22.331C2?
The AC 230V power supply voltage of LME22.331C2 allows the fluctuation range to be 187V ~ 253V AC (50/60Hz), corresponding to **-19% ~ +10%** of the rated voltage; the short-term peak value can withstand 176V ~ 264V. If the range is exceeded, the undervoltage/overvoltage protection will be triggered and the shutdown will be locked.
3.Can the upper limit of ambient temperature for long-term operation of LME22.331C2 exceed + 60℃?
No, the rated ambient temperature range of LME22.331C2 is – 20℃~+60℃, and the upper limit of long-term operating temperature is strictly limited to **+60℃. It is absolutely not recommended to exceed this value.
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