Mitsubishi Electric FR-D720S SC EC Instruction Manual page 19

6.21 Setting for the parameter unit and operation panel . . . . . . . . . . . . . . . . . . . .6-282
6.21.1 RUN key rotation direction selection (Pr. 40) . . . . . . . . . . . . . . . . . .6-282
6.21.2 PU display language selection (Pr. 145) . . . . . . . . . . . . . . . . . . . . . .6-282
6.21.3 Operation panel frequency setting/key lock operation selection
6.21.4 Magnitude of frequency change setting (Pr. 295) . . . . . . . . . . . . . . .6-284
6.21.5 Buzzer control (Pr. 990) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-285
6.21.6 PU contrast adjustment (Pr. 991) . . . . . . . . . . . . . . . . . . . . . . . . . . .6-285
7 Troubleshooting
7.1 List of alarm display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-2
7.2 Causes and corrective actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4
7.3 Reset method of protective function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-17
7.4 LED display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-18
7.5 Check and clear of the fault history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-19
7.6 Check first when you have troubles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-21
7.6.1
7.6.2
7.6.3
7.6.4
7.6.5
7.6.6
7.6.7
7.6.8
7.6.9
7.6.10 Operation panel display is not operating . . . . . . . . . . . . . . . . . . . . . . .7-27
7.6.11 Motor current is too large . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-28
7.6.12 Speed does not accelerate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-29
7.6.13 Unable to write parameter setting . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-30
7.7 Meters and measuring methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-31
7.7.1
7.7.2
7.7.3
7.7.4
7.7.5
7.7.6
FR-D700 SC EC
(Pr. 161) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-283
Motor does not start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-21
Motor or machine generates abnormal noise . . . . . . . . . . . . . . . . . . .7-23
Inverter generates abnormal noise . . . . . . . . . . . . . . . . . . . . . . . . . . .7-23
Motor generates heat abnormally . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-24
Motor rotates in opposite direction . . . . . . . . . . . . . . . . . . . . . . . . . . .7-24
Speed greatly differs from the setting . . . . . . . . . . . . . . . . . . . . . . . . .7-24
Acceleration/deceleration is not smooth . . . . . . . . . . . . . . . . . . . . . . .7-25
Speed varies during operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-26
Operation mode is not changed properly . . . . . . . . . . . . . . . . . . . . . .7-27
Measurement of powers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-32
Measurement of voltages and use of PT . . . . . . . . . . . . . . . . . . . . . .7-33
Measurement of currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-33
Use of CT and transducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-34
Measurement of inverter input power factor . . . . . . . . . . . . . . . . . . . .7-34
Measurement of converter output voltage
(across terminals P/+ and N/-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-34
Contents
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