RONK ROTO-CON Mark II Installation & Operation Instructions

RONK ELECTRICAL INDUSTRIES NOKOMIS, IL 62075
FIELD INSTALLATION & OPERATION INSTRUCTIONS
The Ronk ROTO-CON rotary converter consists of a rotary base unit and one or more
capacitor panels. For UL Listed units, the rotary base unit and capacitor panels must be used
together to maintain their listing.
This manual will answer most of the questions you may have about the basic installation
and operation of the converter. See Section 455 of the National Electric Code for more
information on phase converter installations. If you have any additional questions, contact our
Service Department at (217) 563-8333.
CONNECTION
All wiring should be done by a qualified electrician in accordance with all applicable
electrical codes. Diagram A shows the basic connections between the converter, the single-
phase power, and the three-phase load.
either 240 or 480 volt power but must be operated at the voltage rating of the capacitor panel(s).
Refer to Diagram B for the proper rotary lead connection (numbered leads) for either 240 or 480
volt operation. The capacitors in the #1 panel are connected across the "A" and "B" phases (See
Diagram A, Note #1). The incoming single-phase lines become the "B" and "C" phases of the
three-phase output ("A" phase is the manufactured phase).
Use the "B" and "C" phases for any controls and single-phase loads if they are being
powered from the converter. Do not connect control circuits, control transformers, or other
single-phase loads to the "A" phase (See Diagram A, Note #4). Doing so may damage their
components and/or result in improper operation. Refer to the load equipment information for
any single-phase connections.
1. Features may vary between ROTO-CON Types; check the wiring diagram in your unit's capacitor panel for wiring
information specific to your converter. Diagram A in this manual is general and shows the basic connections.
ROTARY OPERATION
The #1 capacitor panel provides the current to start your rotary base unit and operate
your three-phase load. The converter always must be fully up to speed (1-3 seconds) before
any load is applied. Diagram C is a check list for the converter's output voltages (at idle and
loaded conditions). It is a good idea to check and record these voltages, so you have a set of
reference voltages. When the ROTO-CON is running idle (three-phase load shut off), all the
capacitor current flows into the rotary base unit. That is why the rotary base unit gets warm to
the touch when it is idling. When a load operates, most of the capacitor current now flows to the
load instead, so the rotary base unit will actually cool down under load. Due to the heating
effect of the capacitor current, avoid operating the converter at idle for extended periods, if
possible. Because the capacitors' current flows into the rotary base unit at idle, any additional
capacitor panels must not be directly connected to the rotary base unit.
ROTO-CON
[1]
ROTO-CON rotary base units can operate from
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MAN5251