Summary of Contents for Larson Electronics 240 VOLT SERIES
- Page 1 ALL PURPOSE CNC/HEAVY DUTY Rotary Phase Converters 240 & 480 VOLT SERIES Smart Digital Phase Converter Operation & Installation Manual MTPC-DRB-208.240-1P-20HP-3P...
- Page 2 Make sure the idler motor is wired properly. For the Larson Electronics soft-start idler motor 240 Volts Input (1, 7, A), (2, 8, B), (3, 9, C), (4, 5, 6 bolted together and insulated). 480 Volts Input (1, A), (2, B), (3, C). The following bolted together and insulated: (4, 7), (5, 8), (6, 9) Do not use wire nuts or ground any of these connections.
- Page 3 The phase converter must be started before the transformer is connected electrically. This is done with a safety disconnect switch. Larson Electronics can provide these transformers and disconnect switches.
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Page 4: Physical Installation Environmental Considerations
*Note: Each phase converter comes standard with spare fuses for the ones already installed in the unit. 2.1 PHYSICAL INSTALLATION All Larson Electronics rotary phase converter units come standard in NEMA 1 indoor rated enclosures. NEMA Type 3R rainproof enclosures are available with the AI series converters. 2.1.1 PHYSICAL INSTALLATION ENVIRONMENTAL CONSIDERATIONS... - Page 5 The following diagram shows the electrical schematic for the rotary phase converter: Firmly snap in the green, yellow/white and red switch terminals into the pushbutton switch body. (In the image at right, a clear enclosure cover is used for clarity.) f.
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Page 6: General Wiring Considerations
IMPORTANT, as under sizing the wire may lead to a phase converter that does not start or work properly. To minimize voltage drop, Larson Electronics recommends increasing wire size one size for every 50 feet of run and rounding up. - Page 7 2.1.4 WIRE SIZING RECOMMENDATIONS FOR 240V: FOR 480V: *For all voltages: Conductors listed are minimum recommended based on largest hard starting & CNC amps. For combined HP’s greater than 50% of maximum total HP listed in the tables above, consult NEC & local codes for conductor sizing. The above charts do not replace or supersede any requirements by local, state, or national electric codes.
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Page 8: Checking Voltages
3.0 OPERATION & MAINTENANCE 3.1 STARTING & STOPPING Larson Electronics phase converters are started by turning the rotary switch to the start position. The starting sequence is automatic and the switch needs only to be turned to start and released. -
Page 9: General Maintenance
TEFC model as this prohibits proper cooling. 3.3.2 LUBRICATION Larson Electronics rotary phase converter idler/generators are custom made and come with pre- packed bearings using the lubricant specifically designed for this idler. DO NOT use Lithium based lubricants. These may cause premature bearing failure and will void any warranty.