Type |
LRS Startor |
Soft Startor |
VFD |
|
Maintanence | High Maintanance required | Low Maintanance required | Low Maintanance Reqired | |
Low Skill required Like any Electrician | Medium skill required like trend electrician | High Skill required like Engineer | ||
Starting Current | 3 times roughly of motor FLR | 3 times roughly of motor FLR | 1.2 times roughly of motor FLR | |
Starting Time | No Control | 10 to 100 sec | 10 to 9999 sec programmable | |
Energy Saving | Heavy energy loss | Very small energy saving | Heavy Energy Saving | |
(IF YOU can use drive some time for low speed operation then energy saving will be very high) | ||||
Power factor | Poor as per motor nameplate | Poor as per motor nameplate | 0.9 Power factor | |
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 | |
hour. | ||||
Motor Protections | General MPR dependent | General MPR dependent | High Class semiconductor and microprocessor biased protections for Voltage , Current and Thermal protection. | |
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. | |
Control room interface | only hard wire | only hard wire | Both hard wire and communication interface possible with PLC / DCS System. |