KROHNE IFC 110 Converter - Manual (Page 7)

Part A System installation and start-up Sect. 1.2
05/2003 IFC 110 F 7
1.2 Power supply - connection
PLEASE NOTE !
• Type of enclosure IP 65 to IEC 529 / EN 60529 equivalent to NEMA 4/4X.
• Dimensioning: the flowmeter housing protecting the electronic equipment against dust and
moisture must always be kept closed. The selected clearances and creeping distances comply
with VDE 0110 and/or IEC 664 regulations for contamination grade 2. Supply circuits and
output circuits are designed to meet standards of overvoltage classes III and II, respectively.
• Fuse protection, disconnecting device: fuse protection for the feeding power circuit, and also a
disconnecting device (switch, circuit breaker) for isolating the signal converters must be
provided (see also Sect. 1.3.5 and 1.3.6).
100-230 V AC (tolerance range 85-255 V AC)
• Observe information on the instrument nameplate, power supply voltage and frequency.
• The protective conductor PE of the power supply must be connected to the separate
U-clamp terminal inside the terminal compartment of the signal converter.
• CAUTION: do not remove the internal connection (line) inside the terminal compartment of the
signal converter (yellow/green wire) between the U-clamp terminal and terminal 10 -
protective conductor (protection class I instrument).
• Connection diagrams I - IV for the power supply and for the electrical connection between
flow sensor and signal converter, see Sections 1.3.5 (Standard) and 1.3.6 (EEx).
24 V AC / DC (tolerance ranges: AC 20.4 - 26.4 V / DC 18 - 31.2 V)
• Observe information on the instrument nameplate, power supply voltage and frequency.
• For technical reasons concerning the measuring process, a functional grounding conductor
FE has to be connected to the separate U-clamp terminal inside the terminal compartment of
the signal converter.
• A facility providing a reliable electrical separation (PELV) has to be provided for connections
to functional extra-low voltages (24 V AC / DC) - (VDE 0100 / VDE 0106 and/or IEC 364 /
IEC 536 or equivalent national regulations).
• Connection diagrams I - IV for the power supply and for the electrical connection between
flow sensor and signal converter, see Sections 1.3.5 (Standard) and 1.3.6 (EEx).
IMPORTANT!
For EEx versions, also pay regard to all directions included in Sect. 6.1 and 13.
Only the EEx flow sensor may be installed in the hazardous area. The EEx
certified signal converter must be installed outside the hazardous area!
Warning: Instrument must be properly grounded to avoid personnel shock hazard.