Phase Converter Rotary - Siemens SINUMERIK 840D Maintenance Manual

FADAL MACHINING CENTERS
3.3 PHASE
CONVERTER ROTARY
50
The normal Fadal VMC requires three phase-input power. Some customers prefer to
use rotary phase converters. However, Fadal does not recommend the use of rotary
phase converters.
Rotary phase converters input single-phase 208 to 230 VAC and output three phase
230 VAC. For a VMC close to a 5% voltage balance between legs and ground is
required, in reference to the voltage differences of each phase. Most CNC machines
would require the output power to be 1-1/2 to 2 times larger than the spindle motor (for
a Fadal output must be at or higher than the minimum of the required input; see
Specifications, Section 1.0, MAN-0126 R1). A Voltage Stabilizer may also be required.
The stabilizer's function is to maintain a consistent voltage level of the three phases
during light or no load conditions.
INSTALLATION PROCEDURE MAN-0126_R1