Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 27)

• Depending on the configuration of the equipment, input power will be connected to
the mains input terminals or the input disconnect.
• Ground the cable in accordance with grounding instructions in Earth (Grounding)
Requirements.
• All frequency converters may be used with an isolated input source as well as with
ground reference power lines. When supplied from an isolated mains source (IT
mains or floating delta) or TT/TN-S mains with a grounded leg (grounded delta), set
14-50 RFI Filter to OFF. When off, the internal RFI filter capacitors between the chassis
and the intermediate circuit are isolated to avoid damage to the intermediate circuit
and to reduce earth capacity currents in accordance with IEC 61800-3.
Control wiring
• Isolate control wiring from high power components in the frequency converter.
• If the frequency converter is connected to a thermistor, for PELV isolation, optional
thermistor control wiring must be reinforced/double insulated. A 24 V DC supply
voltage is recommended.
Control wiring access
• Remove access cover plate with a screwdriver.
Figure 9: Control wiring access for A2, A3, B3, B4, C3, and C4 enclosures
• Remove front cover by loosening attaching screws.
Electrical Installation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 25