Veichi AC310, Service Manual

Page: 40 / 63

39
AC310 Universal AC Drive Service Manual
frequency).
⚫ Test the output current: DIP switch to A01 or AO2 current ON terminal, at this time, parameter
setting F03.37=1 or 2, F03.38=1, check C00.20 or C00.21, then press the start button, there will be a
current from 4-20mA or 0-20mA. (After the parameter setting is done, or c10V to GND with
500Ω resistances, measure the voltage at both ends of resistances with DC gear of multimeter, the
operation will be from 0V to 10V, then it is qualified; or directly use the current gear of multimeter to
measure the current value). (After the parameters are set, or use 500Ω resistances to connect +10V and
GND, and measure the voltage at both ends of the resistances with the DC gear of the multimeter, and
the operation will be from 0V to 10V, then it is qualified; or use the current gear of the multimeter to
measure the current value directly). As shown in Fig. 4 (running to the maximum frequency)
⚫ Test the output frequency: DIP switch to A01 or AO2 frequency ON terminal, at this
time the parameter setting F03.37 = 3, F03.38 = 1, check C00.20 or C00.21, then press the start
button, there will be a frequency from 0.2Khz-50Khz.
⚫
(After setting the parameters, measure the output frequency with an oscilloscope), as
shown in Fig. 5 (running to the maximum frequency).
Figure 4 Figure 5
1. Type of fault
Terminal output signal is not normal, signal command action is abnormal
2. Inspection Methods
In the AO analogue output, it is easy to appear is the damage of op-amp U12, as well as
the damage of transistor T3, T4, according to the static maintenance method, the first detection
of the above devices whether there is any abnormality, there is anomaly replacement devices;
there is no abnormality and then go to test other resistors and capacitors.
3. IC Pin Voltage
Note 1: In the measurement of IC pin voltage, are to GND measurement, it is best to use
an oscilloscope to measure (multimeter will be less accurate, using a multimeter in the
measurement of voltage, easy to touch other pins), such as the use of a voltmeter to
measure, there will be a difference
Figure 3