Function; Preconditions For Burner Startup; Undervoltage; Controlled Intermittent Operation - Siemens LME71 Series Basic Documentation

Smart Infrastructure
6

Function

6.1 Preconditions for burner startup



LME7 is reset

All contacts in the line are closed, there is a request for heat

No undervoltage

Air pressure switch or POC must be in its no-load position, or Dbr1 is connected to
terminal X2-02 (depending on program sequence)

Flame detector is darkened and there is no extraneous light

All contacts in the safety loop are closed

6.2 Undervoltage



Safety shutdown from the operating position takes place should mains voltage
drop below about AC 75 V (UN = AC 120 V)

Restart is initiated when mains voltage exceeds about AC 100 V (UN = AC 120
V)


Safety shutdown from the operating position takes place should mains voltage
drop below about AC 165 V (UN = AC 230 V)

Restart is initiated when mains voltage exceeds about AC 195 V (UN = AC 230
V)

6.3 Controlled intermittent operation

Depending on the PME7, refer to User Documentation A7105.x.
After no more than 24 hours of continuous operation, the LME7 initiates an automatic
controlled shutdown followed by a restart.
Basic Documentation LME7...
6 Function
43/116
CC1P7105enr
24.07.2020