Type
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LRS Startor
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Soft Startor
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VFD
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Maintanence |
High Maintanance required |
Low Maintanance required |
Low Maintanance Reqired |
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Low Skill required Like any Electrician |
Medium skill required like trend electrician |
High Skill required like Engineer |
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Starting Current |
3 times roughly of motor FLR |
3 times roughly of motor FLR |
1.2 times roughly of motor FLR |
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Starting Time |
No Control |
10 to 100 sec |
10 to 9999 sec programmable |
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Energy Saving |
Heavy energy loss |
Very small energy saving |
Heavy Energy Saving |
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(IF YOU can use drive some time for low speed operation then energy saving will be very high) |
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Power factor |
Poor as per motor nameplate |
Poor as per motor nameplate |
0.9 Power factor |
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No of start stop per hour |
limited to motor may be 4 to 5 |
maximum 6 start / hour |
No limit can give 20 or 30 start per |
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hour. |
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Motor Protections |
General MPR dependent |
General MPR dependent |
High Class semiconductor and microprocessor biased protections for Voltage , Current and Thermal protection. |
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Speed regulation |
Not possible to vary the motor speed |
Not possible to vary the motor speed |
Can control the motor speed from 0 rpm to rated rated, means 0 to 100% speed variation is possible. |
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Control room interface |
only hard wire |
only hard wire |
Both hard wire and communication interface possible with PLC / DCS System. |
