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8
DRIVE SPECIALIST
Table 8.2:
Torque X Power curve information for half rated speed
Load (%)
Efficiency
Mechanical power (kW)
Motor losses with drive (kW)
Electric power (kW)
50%
96,0%
93
8,87
101
75%
96,1%
139
12,95
152
100%
96,2%
185
16,81
202
8.2.2
Diagnostic
The Diagnostic page presents a health analysis of the inverter (
Figure 8.3
),evaluating the risk of its shutdown due
to the conditions of the AC power supply and the fans that cool the power semiconductors.
As for the fans, an estimate of the remaining days of operation is also shown, when the end of their expected
service life will be reached.
General health
Critical
3 minutes ago
Critical
Supply
Healthy
Cooling
Diagnostic
Thresholds
3 minutes ago
3 minutes ago
Figure 8.3:
Example of inverter health information flagged on the Diagnostic tab
1. Power supply:
The quality of the AC power supply is assessed through the reading of the inverter DC link voltage. The
average voltage of the DC link is directly related to the amplitude of the AC power supply (effective value).
During braking moments, that is, when the motor connected to the inverter output works as a generator, the
DC link voltage is no longer defined by the AC power supply.
Figure 8.4:
Indication of the power supply quality in relation to the effective AC power supply
The amplitude of the voltage ripple, especially the amplitude of the second harmonic (100 Hz for 50 Hz
AC power supply and 120 Hz for 60 Hz AC power supply), is directly related to the phase balance of the
three-phase supply voltages (
Figure 8.5
). In addition to the risk of the inverter going into fault mode due to
high voltage ripple (F006 Imbalance Phase Loss in the AC Power Supply), operation for a long time under
conditions of greater voltage imbalance may bring the following undesired effects:
a) Reduced service life of the DC link capacitors and inductors due to higher ripple current;
Low Voltage Devices | 8-3
Summary of Contents for Drive Scan
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Page 4: ...Summary of reviews Version Revision Description 1 0X 00 First edition...
Page 11: ...2 INSTALLATION RECOMMENDATIONS Low Voltage Devices 2 2...
Page 59: ...6 SETTING THE DRIVE SCAN ON THE MFM Low Voltage Devices 6 14...
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