rotary converter – rt range installation & operating instructions
Contents
1. TRANSWAVE Sales Service and Support Tel 0121 7084522 Switchboard 0121 7082811 Fax 0121 7654054 E mail transwave powercapacitors co uk www powercapacitors co uk a Ee ROTARY CONVERTER RT RANGE INSTALLATION amp OPERATING INSTRUCTIONS Adequate overload protection for both the driven machinery and the supply circuit to the converter is the responsibility of the customer The customer should also ensure that the electricity system and cable supplying the converter is of sufficient capacity to allow the motor to start without causing undue supply disturbances as a consequence of voltage drop THE CUSTOMER MUST ENSURE THAT THE OUTPUT NEUTRAL FROM THE CONVERTER IS NOT CONNECTED TO THE ELECTRICITY PROVIDER S SUPPLY NEUTRAL OR THE SUPPLY NEUTRAL FROM A GENERATOR THE SINGLE PHASE SUPPLY NEUTRAL MUST BE KEPT ELECTRICALLY SEPARATE FROM THE CONVERTER OUTPUT NEUTRAL TO AVOID DAMAGING THE CONVERTER 1 Ensure that the details on the converter rating plate are compatible with the electricity supply system and the required motor loads 2 The incoming supply should be connected to the converter via an isolator and protection device i e Fuse or Type C motor rated circuit breaker Recommended fuse ratings and cable sizes are indicated below The output from the converter takes the form of a three phase neutral and earth socket Notation L L2 L3 and N All earth connections should be securely connected to a good earth point R2. ed before restarting NOTE The output from a TRANSWAVE Converter cannot be compared directly to a mains three phase electricity supply The TRANSWAVE Converter offers an artificial means by which a three phase motor or motors can be operated from a single phase electricity supply The TRANSWAVE Converter cannot be made to work equally on all motors even though the horsepower speed and voltage ratings are the same Motors of differing manufacture and motors designed for differing applications vary considerably in their electrical characteristics It is not always possible to make a universally applicable converter to operate a motor of given horsepower and rating TRANSWAVE Converters are not designed for use in conjunction with continuous duty applications Power Capacitors Limited 05 2002
3. emoval of the socket will compromise any warranty offered by the manufacturers ROTARY CONVERTER RATINGS SINGLE PHASE SUPPLY VOLTAGE CYCLIC LOAD 220 240 VOLT Fuse Maximum Load Maximum Load Circuit Minimum Load Single Motor Multi Motor Breaker Cable No minimum 3 00kW 04 0hp 3 00kW 04 0hp 25A 4 0mm No minimum 4 00kW 05 5hp 4 00kW 05 5hp 25A 4 0mm No minimum 5 50kW 07 5hp 5 50kW 07 5hp 30A 4 0mm No minimum 7 50kW 10 0hp 7 50kW 10 0hp 40A 6 0mm No minimum 11 0kW 15 0hp 11 0kW 15 0hp 60A 10 0mm No minimum 15 0kW 20 0hp 15 0kW 20 0hp 80A 16 0mm No minimum 15 0kW 20 0hp 18 5kW 25 0hp 100A 25 0mm No minimum 18 5kW 25 0hp 22 0kW 30 0hp 120A 25 0mm Minimum size for run of up to 20m For longer cable runs see current edition of BS7671 AS300 amendment 2 3 The RT converter incorporates a rotary transformer which establishes the artificial three phase output from the converter when energised 4 Before any machinery is connected to the output of the converter switch the converter on by using the ON button located on the converter The converter will automatically attain its full operating speed within a few seconds amp NRA Go IS09001 V A QUALITY ME K MAAGI 015 POWER CAPACITORS LIMITED 30 REDFERN ROAD TYSELEY BIRMINGHAM B11 2BH REGISTERED COMPANY BS EN ISO 9001 Certificate No 8174 The initial surge required to start the motor is provided by the boost circuit of
4. the L phase is used in conjunction with the output Neutral Multi motor applications should be supplied from the converter output via a three phase radial or similar Note that the output neutral is for control circuit loads only It should not be connected to any single phase inductive or resistive loads If the rotation of the driven machine motor is incorrect ensure that the converter phases marked L and L are changed for 415 volt phase phase control circuitry For 240 volt phase neutral control circuitry ensure that the phase neutral supply is maintained and the other two phases reversed The motor starting current is limited to approximately three times the full load current of the motor The starting characteristics of a three phase motor supplied by a converter are similar in nature to Star Delta starting on a three phase system Significant reductions in starting torque are experienced when compared with direct on line starting on a three phase supply For machinery supplied by a converter direct on line starting is recommended For machinery fitted with Star Delta starters the period in the star connection should be as short as possible to ensure a successful start 6 An over temperature sensor protects the converter If the converter trips out on over temperature the output supply lamp will go off The converter will not restart until it has sufficiently cooled Checks should be carried out to ascertain why the converter has overheat
5. the converter The boost on light indicates the circuit is energised The circuit is controlled automatically from within the converter switching on whenever a motor is starting against load and switching off once the motor has attained its full running speed If the boost light does not go out within a few seconds the converter should be switched off to avoid the possibility of electrical damage The reason for this condition should be checked and corrected before the converter is restarted 5 Note that if voltages were checked at this point phase to phase readings would be similar to those experienced on a mains three phase supply Note that the voltages do not relate to earth as they would on a mains three phase supply Switch the converter off and connect driven machines to the converter output socket Care should be taken with the connection of the machine to the output socket If the machine has a contactor starter the 400 415v control coil must be fed from the phases marked L and L2 If the control circuit is fed incorrectly i e connected to the phase marked L3 the contactor could chatter when operating Similarly a control transformer and or lighting transformer with a primary winding of 415v must be fed from the L and L phases Connection to the L phase could lead to premature ageing of the control transformer The RT converter can accommodate both a 415v control circuit as above and a single phase 240v control circuit provided
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