OPERATION AND INSTALLATION MANUAL STATIC PHASE CONVERTERS (MTPC-SCHD Series) WARNING: To reduce the risk of injury, the user must read and understand the operator’s manual before using this product.
MTPC-SCHD Series Thank you for your purchase of a Larson Electronics MTPC-SCHD series static phase converter. WARNING Standard Warning (General) WARNING: READ CAREFULLY BEFORE INSTALLING FIXTURE. RETAIN THESE INSTRUCTIONS FOR FUTURE REFERENCE. CRITICAL SAFETY INSTRUCTIONS: • • • • • INSTALLATION SHOULD ONLY BE CONDUCTED BY A QUALIFIED ELECTRICIAN IN ACCORDANCE WITH NEC AND ANY RELEVANT LOCAL BUILDING CODES. RISK OF FIRE OR ELECTRIC SHOCK.
MTPC-SCHD Series Introduction and Installation Notes HIGH VOLTAGE – Risk of Electrical Shock. This equipment is connected to line voltage that can create a potentially hazardous situation. • Always make certain power is off before servicing this equipment. • Do not connect control circuits to T3. • Do not connect a ground or neutral to T3. • Make sure static phase converter and equipment are properly grounded. • Wire recommendation is based on the use of copper wire.
Wiring and Connection Wiring Method #1 L1 L2 Single Phase Power L1 Three Phase L2 (Fused or Circuit Breaker Protected) T3 Three Phase Motor Load Motor Starter or Switch Static Phase Converter o Single phase power connects through L1 and L2. T3 is the generated phase. o Equipment with magnetic controls must operate from L1 and L2, the single phase lines. To identify these lines, connect the two (2) single phase lines to any input terminals/lines on the machine and press the start button.
Initial Start Up and Checking Voltage o Turn power on to the static converter. You may hear a clicking noise from the contactor pulling together. This is normal. o Check Voltage Voltage – Load “Off” L1 to L2 – 208 – 250 Volts L1 to L3 – 208 – 250 Volts (Same as L1 to L2) L2 to L3 – 0 Volts o Start load motor. The red indicator light will turn on and remain illuminated until the Off button is pressed. o If motor runs backwards, switch any two (2) motor leads.
STATIC PHASE CONVERTER INSTRUCTION SHEET CAUTION: Read the following carefully before attempting installation. Using the converter as in Method No. 1 will produce approximately 2/3 rated horsepower. Heavily loaded applications, such as compressors, blowers, water pumps, hydraulic pumps, etc., a 50% larger motor must be fitted. Otherwise, Method No. 2, shown on reverse side of this page, could be used. Or, use our full power Rotary Phase Converter.
STATIC PHASE CONVERTER INSTRUCTION SHEET OPERATION For multiple motor applications, the largest motor must always start first, and it must be at least 50% larger than any other motor starting on the same converter, or if they start simultaneously the combined horsepower of all the motors must fall within the rating of the converter. Always start a machine out of gear or in lowest spindle speed at initial hook-up to reduce load.
MTPC-SCHD Series TROUBLESHOOTING PROCEDURES As with any troubleshooting procedure, there is no substitute for a clear understanding of the installation procedures involved. The contents of this manual should be studied and THOROUGHLY UNDERSTOOD. Make absolutely certain that all factory installation procedures regarding physical mounting, protection from foreign material, wire sizing, fuse protection, etc., have been followed. Check all connections to be certain that they are tight.
b. Light does not come on. 1. You may have a bad connection or an open fuse. Check all fuses and connections. 2. You may have the wrong converter. Check to see that the motor you are attempting to start is within the horsepower range of your converter, i.e., a converter that is too large for your motor will not work. 2. Motor starts but will not come up to full RPM A. Motor slows down. Red light turns on. Motor RPM increases Red light turns off. Unit cycles as above. 1.
at the motor only. backwards. 5. Motor is running hot. A. Are your thermal overloads tripping? a. No. b. Yes. 1. Your motor is running within accepted NEMA specifications. 1. Your thermal overloads may be set too close to nominal. Check trip point and readjust if necessary. 2. You may have a loose connection. Check that all connections are tight. 3. You may have used insufficient wire size for the installation. 4. You may have insufficient motor ventilation.
7. Magnetic switch chatters or does not close. A. Chattering. 1. You may have a M3 (mfg leg) wired to your magnetic coil. M3 (mfg leg) must be used to power the motor only. 8. Excessive blowing of fuses, circuit breakers, or heaters. A. Instant blowing of fuses or circuit breakers. 1. You have a short circuit. Check circuit for broken or loose wires. Check motor for shorts. Check all connections. B. Nuisance tripping of fuses, circuit breakers, or heaters. 1. You have a bad connection.
