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Drive PID action-
After checking the air pressure level at the outlet pipe, internal PID of the drive compares between the set pressure levels & presents pressure level, if present pressure level is below the set level it start increasing the RPM of the motor to increase the air pressure. The rate of change of motor RPM & amount by which with respect to the air pressure is controlled by PID parameter. The parameters are no.417, Speed PID Proportional Gain & Par, no 418 Speed PID integral Time.
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Automatic loading & unloading control:
Loading & unloading of compressor can control by using internal relay of
drive. Two different limit point (one for compressor loading & another
for unloading) can be set in parameter Par no.227 Warning feedback low &
Par. No 228 Warning feedback high & with reference to this parameter internal
relay can be programmed which will activate or deactivate as per the pressure
feedback. By using this relay valve can be operate which will block or pass
the airflow to the air tank.
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Safety features:
Motors parameters like current, frequency, output current; output frequencies, temperature
can control to the safety limit in VFD parameter. Two limits can program in drive for
each motor parameter that is prewarning limit & alarm limit. If output exceeds warning
limit VFD will generate & indicate warning on VFD display unit, if output will exceeds
the warning limit VFD will generate the Alarm & stop the drive. By using internal relay
output drive functions can control. Also same relay contact can used to indicate the
alarm fault on panel. The operator should rectify the fault first and then he can press
the reset switch provided on the panel.
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System status display-:
To give the online status information of outlet pressure & motor RPM
of to the operator, status indicators are provided on the panel. Also
to indicate the VFD status, VFD ON, VFD OFF & VFD TRIP, lamp indicators
are provided on panel.
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| Actual energy saving: |
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Watt-hour reading on Star-delta:
On star-delta loading unloading is 12 & 12hours.
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| On loading reading: |
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Sr. No. |
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Voltage |
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Current |
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Pressure |
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Motor RPM |
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1 |
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400 V |
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66 A |
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6.6 Bar |
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1500 RPM |
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| As the loading time is 12Hour in a day total power consumed is 493.25Kw |
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| No loading reading: |
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Sr. No. |
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Voltage |
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Current |
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Pressure |
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Motor RPM |
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1 |
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400 V |
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26 A |
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7.6 Bar |
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1500 RPM |
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| As the no loading time is 12 hour in a day total power consumed is 194.54Kw |
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| Total power consumed on star-delta in a day is = 687.79Kw. |
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