Krom Schroder PFU 780

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Summary

1 Application

1.1 Examples of application

Main burner ON/OFF, pilot switches off automatically after main burner starts.

1.1.2 Stage-controlled main burner with permanent pilot burner

Main burner ON/OFF, pilot and main burners operate simultaneously.

1.1.3 Modulating-controlled burner

Continuous main burner control via air valve for capacity.

1.1.4 PFU 780..D: High temperature equipment

Flame control by temperature, standard monitoring below 750°C.

2 Certification

Certified pursuant to SIL

Compliance for systems up to SIL 3 per EN 61508.

EC type-tested and certified

Compliance with Gas Appliances, Low Voltage, and EMC directives.

3 Function

3.2 PFU 780 program sequence

Describes the normal start-up sequence of the PFU 780.

3.3 Program status and fault messages

Lists program statuses and corresponding fault messages.

4 Parameters

4.1 Scanning the parameters

How to view parameters using the unit's display and buttons.

4.2 Flame control

Details on flame detection, signal processing, and thresholds.

4.3 Pilot and main burner monitoring

Describes operating modes for pilot and main burner monitoring.

4.4 Behaviour in start-up position;standby

Unit behaviour during start-up and standby phases.

4.5 Behaviour during start-up

Details burner behaviour during various start-up steps.

4.6 Behaviour during operation

Describes unit behaviour during normal operation and fault conditions.

4.7 Air valve control PFU..L

Controls air valve functions for PFU..L models.

4.8 Manual operation

Procedures for setting and analysing faults in manual mode.

4.9 Password

Protects parameter settings with a password.

6 Project planning information

6.3 Minimum combustion time

6.4 Safety interlocks (Limits)

How safety interlocks affect operation and faults.

6.5 Emergency stop

Procedures for emergency stop situations.

6.6 Reset

6.8 Protecting the pilot burner from overload

6.12 Furnace control

6.15 Changing parameters

7 Flame control

7.1 With ionisation sensor

7.2 With UV sensor

7.3 Via the temperature in high temperature equipment

High temperature operation using DI input for indirect flame control.

9 Technical data

9.1 Safety-specific characteristic values

SIL rating, diagnostic coverage, failure probabilities, SFF.

9.2 Operating controls

11 Legend