Field Instruments

General

The microprocessor based control OBC 81A.12 offers stable and precise timings independent of variations in supply voltage and ambient temperature. The control is undervoltage protected in accordance with EN 298:2012. In case of undervoltage the control will prevent the burner from starting and simultaneously show a flash code. Besides this, up to five other fault types can be read out as flash codes when the control is in lockout. The design complies with the requirements of the RoHS and WEEE directive.

Features

• For 1 stage burners up to 30 kg/h
• For burners with or without preheater
• Precise and reproducible timings
• Limitation at 3 restarts by flame failure within the same operating period
• Limitation of 10 min. on preheating time
• Remote reset and alarm output
• Ignition out on terminal 6 and 7
• Indication of reason for lockout
• Indication of preheating and operation

Specifications

• Make: Danfoss
• Model: OBC 81A.12
• Order Code: 057H8706
• Rated voltage: 230 V~
• Operating range: 195-253 V~
• Frequency: 50-60 Hz ± 6%
• Consumption: 6 VA
• Reset: Immediately
• Reaction time on flame failure: Max. 1 s
• Undervoltage protection: < 170 V
• Protection class: II
• Pollution degree: 2
• Main fuse (terminal load, see electrial diagram) : Max. 10 A
• Cable connection:  Plate for 5 PG 11 screwed connections or plate with knockouts
• Ambient temperature:-20 to +60°C
• Installation: Any position
• Enclosure: IP40
• Flame monitoring: UV, LD or LDS
• Required flame signal: No flame / dark ≤5 μA Flame / light ≥65 μA
• Max. cable length between OBC and UV, LD/LDS: 20 m (installed separately)

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