Nidec E300 Series - Brake control optimization

To Next Page

To Previous Page

Safety

information

Product

information

Mechanical

installation

Electrical

installation

Getting

started

User Menu A Commissioning

Advanced

Parameters

Diagnostics

Optimization CT MODBUS RTU Technical Data

Installation and System Design Guide 301

Issue Number: 1

10.7 Brake control optimization

Optimization of the brake control can be carried out adjusting the brake release apply times along with the current and frequency thresholds.

The brake release and apply times will vary dependant upon the time taken for the motor energise and dependant upon the brakes mechanical

arrangement and operating times.

Table 10-8 Brake control optimization parameters

Brake Control Adjustmen

Optimise the brake control to achieve a smooth start where the Motors brake is opened on-time, not too early, or too late for both generating torque at

the Motor and lifting the Motor brakes without a jerk and roll back. Using the drives adjustable brake control delay times the brake operation can be

optimised. The target is to have a continuous and fast transition from standstill to travel and onto stop without any jerk impacting on the ride quality.

Start

• Adjust the Brake Release Frequency D08 > Motor rated slip where maximum torque can be generated. Setting D08 < Motor rated slip will result

in limited torque on brake release

• Optimise Brake Control Release Delay A47 (D04) to ensure a smooth start

• Motor Magnetised D01 = On (1)

• Torque Producing Current J24 is generated to overcome Lift system load

• Ensure brake control release delay is not excessive as this can lead to a jerk on brake release where tension builds against the brake

Ensure Start Optimizer Speed G46 > Brake Release Frequency

Motor torque ramp down time

Stop

• Adjust the Brake Apply Frequency D09 > Motor rated slip where maximum torque is available to bring the Motor to stop with the car at floor.

Setting D08 < Motor rated slip will result in limited torque and roll back or overshooting the floor level

• Optimise Brake Control Apply Delay A48 (D05) to ensure a smooth stop

• Adjust Lower Current Threshold D07 to ensure sufficient torque during Motor brake apply

• Ensure brake control apply delay is not excessive as this can lead to roll back or overshooting the floor level due to insufficient Torque Producing

Current J24 nearing zero speed

Motor brake mechanical noise

In addition to the brake control release and apply delays above there is an additional parameter which defines the time taken to build torque during

the start (prior to brake release), and release torque during the stop (following brake apply). The torque ramps manage the transfer of load between

the Motor and mechanical brakes preventing mechanical acoustic noise during operation.

Overcoming roll back during brake release (RFC-A, RFC-S)

Jerk and movement of the Motor sheave when the Motor brakes open

• Increase A57 / I20 Start Lock P Gain for faster response during brake release until control noise / instability appears where A51 / I05 Start current

loop gain can be adjusted, increased to overcome Motor noise.

• Increase A50 / I02 Start Speed Loop Ki for stiffer control and maintaining zero speed during and following brake release.

If Jerk and movement of the Motor sheave is still present

• Increase A57 / I20 Start Lock P Gain further along with A56 / I21 Start Lock P Gain Speed Clamp for the Start locking position control.

• When vibrations start to occur with the higher gain setting reduce A57 / I20 Start Lock P Gain in steps of 1.00 from the current setting.

Parameter Setting

Brake Control Release Delay

(D04)

This is the time taken for the brake to fully open during the start prior to starting the travel.

Recommended = 400 to 500 ms

Brake Control: Upper Current

Threshold (D06)