METSO PDP601 Voltage monitoring module

When an error or a stop condition occurs, requiring the motor to be stopped, parameter P21 determines the way the drive is de-energised and braking is applied. An error situation is treated in a different manner to a stop situation, consequently a stop will override error stop settings. In a stop situation dynamic braking may be used to bring the motor to rest as quickly as possible. The dynamic brake is controlled via the standby contact (PLC O/P A1), depending upon the state of P37. When P37=‘5’ A1 will be set to ‘0’ by a stop condition, which can be used to apply the dynamic brake. Parameter P21 modifies the way the standby contact opens.

The stiffness setting required depends upon

 how quickly you need the drive to respond to programmed speed changes. The greater the stiffness of a drive the quicker and more accurate is the speed regulation. Too much stiffness will cause the closed loop control system to oscillate whilst too little will result in poor speed regulation. The default setting is 100% which should be ‘tuned’ to suit the target application.

Damping determines

 the nature of the response to a transient speed change. Too much damping produces a sluggish response, whilst too little results in overshoot and oscillations. It is usual to adjust for ‘critical damping’ which gives the fastest response without overshoot. The response may be monitored using an oscilloscope connected to X8/10. The default setting is 100% which should be ‘tuned’ to suit the target application.Frequency compensation is used to suppress mechanical resonance in the system. The default setting is 450Hz.Bandwidth refers to the bandwidth of the tach filter used to limit wide frequency variations in the resolver feedback signal. The default setting is 400Hz.

Common problem

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