SIMULATION MODE

When it comes to diagnostics I find the master drive to have a very good feature called as SIMULATION mode. In this mode we can test the drive at a very low voltage say 24v. This is a very important test when it comes to fault finding in masterdrive and I think every user of masterdrives should know this.

This test should be done on a drive which has all the power devices ok. i.e. the i/p rectifier bridge and the o/p inverter bridge components ok. This can be tested with a multimeter in resistance mode.

First switch off the source of the incoming AC / DC supply. This is very important. Next remove the X9 connector if any. Connect only 24 volt +ve to pin 1 and –ve to the pin 2 of the X9 connector of the drive. No other wires should be connected to the X9 connector.

Now connect the +ve of the 24v to the C (L+) terminal and the –ve to the D(L-) terminal of the drive. The same 24v source can be used which we connected at the X9 conn.

Switch on the 24v source and the display will come.

I will recommend a spare cuvc card to be used for this testing so that we do not disturb the parameterization of the existing card. You can even use the existing card if you have the parameter backup with you and you can reload your parameters back after the test.

First do a factory reseting of the parameters by P60= 2 and then P970 = 0

Now make P372 = 1 By this now we have enabled the SIMULATION mode of the masterdrive. Now give an “ON” command to the drive from the pmu and increase the frequency to the max say 50hz. Now you can check the o/p pulses of the drive on a oscilloscope. You will see the PWM waveform. All the 3 phases should have the same waveform which will tell us that the CUVC , IVI , IGD and the IGBT’s of the drive functioning ok. Also the powersupplies are ok. Also you can check the o/p voltage with a true rms multimeter and will be approximately 18V in all the 3 phases.

Dear Diwa,/Abdelal,

May I suggest you to bring all this information(different threads on informations) under one roof by just extending your original thread on the subject and just adding the reply’s.

All such threads can be mark as highest tip and keep on the top. I fear that All separate topic will get lost in such big forum.

Hope moderator take the similar actions on these tips.

hi , this information as been very useful to me. Thank you.

Dear Diwa,

I tested the drive by  the way you said, but the pins  5 and 6 of socket X9 needed to be connect to each other.