How to build a Combination Manual Motor Starter, Selecting Components
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we're building a combination manual motor starter using Fuji components offered by automation direct I'm Carrie Scheiber and this is part 2 selecting the components a combination motor starter is configured using four major components a manual motor starter for circuit protection and manual starting and stopping of the motor a contactor for switching the voltage to the motor a link module for connecting the manual motor starter and contactor together and a baseplate for mounting all of the components together step 1 determine the frame size we will use combination starter selection tables to help select our components these tables are available in the automationDirect catalog or in the technical support Fuji motor control selection guide on our website for motors from 1/2 to 10 horsepower at 240 volts or 3/4 to 20 horsepower at 480 volts we can use a 45 millimeter frame with four motors from 3 to 20 horsepower at 240 volts or 5 to 40 horsepower at 480 volts we can use a 55 millimeter frame you may have noticed that some of the motor horse powers are available in both the 45 millimeter and 55 millimeter frame sizes so how do you determine which one is right for your application if you are using other 55 millimeter frames in the larger horsepower range then you may want to use all 55 millimeter frames otherwise use a 45 millimeter frame which will save panel space and it costs less than a 55 millimeter frame we'll be using a 30 horsepower motor at 480 volts which means we will be using a 55 millimeter frame step 2 select a manual motor starter we will be using a 55 millimeter selection table let's start by finding the correct voltage and horsepower when looking at the selection table you will notice there are two choices for a 30 horsepower motor this is because there are different adjustable current overload ranges available for the 30 horsepower motor to determine which range to use we must look at the nameplate on the motor if the full load ampere 18 is 40 amps with a service factor of 1.15 then multiply 40 times 1.15 which equals 46 amps therefore we will select the MMS with a range of 35 to 50 amps which is part number bm3 VHB - 0 5 0 found in column a step 3 select a contactor now that we have the MMS we will follow across the table to column B column B lists a contactor available for the MMS there are two contactors shown but four are available the contactor is selected based on the coil voltage the coil voltage is determined by your control voltage for a 110 volt AC coils select part number s102 20 volt AC coil replace a 10 V AC with 220v AC the same for a 24 volt AC coil if using a 24 volt DC coil select part number c18145 we are using a 110 volt AC coil so we will select the part number s102 link module continue to follow across the table to the next column column see the link module part number is bz 0 lv e v 1a a step 5 select the base plate go to the last column column D and select the base plate the part number is bz 0 b pv e v 1 a step 6 using in a UL type ii application if using in a UL type ii application there must be a visible means of indicating which type of function has occurred there for a short circuit alarm contact block part number bz 0 TK UAB must be installed we are now ready to assemble the combination motor starter