Hi, this is Craig Hartman for VFDs.com. Today we are going to learn how to program the Mitsubishi A700 Series of variable frequency drives. This is the Mitsubishi A700 drive. This is an advanced, high-performance drive. If you are looking for something simple, for fans or pumps, you might want to check out the F700.
This is the standard keypad on the A700, we are going to remove this keypad and replace it with an advanced keypad. The advanced keypad is easier to program, gives you more information, and gives you diagnostics and other high-performance features at a very nominal price. This particular drive is a 200 volt drive, and we have our three phase power coming into the input terminals of the drive.
The first thing we want to do to program it is to push this “HAND” button. It may say “HAND” or “PU”. We are going to show you only the minimum functions that you are going to need to program this drive – they are called parameters. The way you find a parameter is you get it in “HAND” mode, you press “Parameter Set” (“PrSET”), and then you press the parameter number.
In this case, we will start with number 1. Parameter number 1 is the maximum frequency. We are going to program the maximum frequency for 60 Hertz. We simply type in 60, and then “WRITE”, and it will program that for 60 Hertz.
The next thing we are going to program is “parameter set”, “2”, “READ”, and that is your minimum frequency. The minimum frequency can be set to zero for many applications. For most fans, we tend to set this about 12 Hertz. For pumps, you want to make sure that this is high enough so that you don’t deadhead the pump. Let’s program that for 12 Hertz, that will by “1-2” and then “WRITE”. You can see when it completes it says “completed” here, and the new value flashes.
Next, let’s go to parameter 7 with “parameter set”, “7”, “READ”, and this is your acceleration time. Your acceleration time will depend upon the load that you have. The higher the inertia, the longer the acceleration time. Let’s program this for 10 seconds. 10 seconds and “WRITE”.
Next, parameter 8 – “parameter set”, “8”, and “READ”. This is your deceleration time, how long it takes to slow down. Let’s make this 10 as well. We will type in “1-0” and then “WRITE”.
Next, we have our overload relay. You need to protect the motor from overload, so we need to program the overload relay for the rated full load amps on the nameplate of the motor. “Parameter set”, “9”, “READ”. Let’s say that our motor is rated for 3 amps. We will put in “3” and then “WRITE”.
We need to program two more things. We need to program the volts per Hertz. It is very important that these be set accurately for the motor. Our Hertz is parameter 3. “Parameter Set”, “3”, “READ”, and you can see the Hertz is 60. Since that is already correct, I am not going to change it. This will be on the motor nameplate. The next thing we’ll do is set our motor voltage, “parameter set”, “19”, and “READ”, and that gives us our motor voltage. In this case, we have a 230 volt motor, so we will type in “2-3-0” and then “WRITE”. Now we have the motor voltage and the motor frequency.
One last parameter is parameter 14. This tells you whether you are going to have a variable torque load or a constant torque load. In general, this means fans and pumps would be variable torque load, most other drives are going to be constant torque. In this case, we are going to type “parameter set”, “1-4”, and “READ”. If we have a constant torque load, we’ll program it for 0. If we have a variable torque load, we’ll program it for 1. So in this case, let’s assume that it’s constant torque. We type “0” and then “WRITE”.
There are many other parameters here, but these are the minimum that you need to setup any drive and start it running. If we want to run this from the keypad, we simply push “HAND”, we type in the speed that we want it to run – let’s say 52 Hertz, “WRITE” – and then push “forward” (“FWD”). You can see that the drive turns on, the frequency ramps up to 52 Hertz, and then it will stop. If we want to stop it, we push “STOP” and it will ramp down from 52 Hertz to 0 in the 10 seconds that we programmed and it will stop.
That is how to program the basic parameters on a Mitsubishi A700 series drive using the advanced keypad.
Craig is the Vice President of Engineering at Energy Management Corporation. He is a Professional Engineer (PE) and carries over 30 years of experience in the world of electrical automation. Besides amassing an impressive amount of knowledge in his magnificent brain, he is also a Master Scuba Diver (MSD), a performing magician, and a professional DJ. Truly a man of many talents.