DC590P, STANDSTILL and PRESET TORQUE

Hello Dusan,

So when you're trying to control current at standstill that isn't quite possible with STANDSTILL LOGIC enabled as you don't have the drive enabled to control current. All the SCR's turn off.

"Another request is that drive holds the load tight while speed reference is set to zero"

• You can't do this with STANDSTILL LOGIC enabled (see below snippet from the help file). At zero speed with this in place, everything disables so that the tension inherent in the system takes over to begin pulling. Once detected to be going greater than 2% speed setpoint, it then allows you to start controlling again.

"why did we have unlimited current increase in situation when drive started the motor with zero speed, while the brake is still applied "

• You had your brake applied when you started it is that right? When you tell the drive to run at a certain speed, it will attempt to do so with all of its current unless you implement current limiting. The opposite is true in torque mode when it tries to run up to a certain torque with all of it's speed capabilities unless speed limiting is implemented. You only control one or the other at any given time. That is a principle of servo control. What it sounds like you were doing was telling it to run, but the brake was engaged, and thus it continued to dump current across the armature.

You can still  control torque at zero speed, it sounds like that's what you're trying to do. Do you have any feedback present in the system? We are capable of doing this, we have several premade winder applications that can operate at zero speed; that seem very similar to what you're trying to do. You can check them out in DSE under File -> New -> 590P -> Apps -> [Any V8 template]. We advise to take a look at the SPW winders as the CPW are normally niche used and require a great deal of setup.

In the future if you would like a very fast response please email us at emn_support@parker.com to get in contact with Parker Applications for EMN products.

Hello Dusan,

So when you're trying to control current at standstill that isn't quite possible with STANDSTILL LOGIC enabled as you don't have the drive enabled to control current. All the SCR's turn off.

"Another request is that drive holds the load tight while speed reference is set to zero"

• You can't do this with STANDSTILL LOGIC enabled (see below snippet from the help file). At zero speed with this in place, everything disables so that the tension inherent in the system takes over to begin pulling. Once detected to be going greater than 2% speed setpoint, it then allows you to start controlling again.

"why did we have unlimited current increase in situation when drive started the motor with zero speed, while the brake is still applied "

• You had your brake applied when you started it is that right? When you tell the drive to run at a certain speed, it will attempt to do so with all of its current unless you implement current limiting. The opposite is true in torque mode when it tries to run up to a certain torque with all of it's speed capabilities unless speed limiting is implemented. You only control one or the other at any given time. That is a principle of servo control. What it sounds like you were doing was telling it to run, but the brake was engaged, and thus it continued to dump current across the armature.

You can still  control torque at zero speed, it sounds like that's what you're trying to do. Do you have any feedback present in the system? We are capable of doing this, we have several premade winder applications that can operate at zero speed; that seem very similar to what you're trying to do. You can check them out in DSE under File -> New -> 590P -> Apps -> [Any V8 template]. We advise to take a look at the SPW winders as the CPW are normally niche used and require a great deal of setup.

In the future if you would like a very fast response please email us at emn_support@parker.com to get in contact with Parker Applications for EMN products.