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Diagnostics Optimization CT MODBUS RTU Technical Data
E300 Design Guide 247
Issue Number: 1
This sets the time delay in ms for the brake to be physically applied. This is used during stopping to determine if the brake can be considered fully
closed and the control sequence can be completed i.e. prior to ramping the motor torque down and disabling the drive.
The Current Magnitude, Total Output Current (J22) is compared to an upper and lower threshold by a comparator with hysteresis to give torque
present and drive output open detection functions respectively. Brake Control: Lower Current Threshold (D07) and Brake Control: Upper Current
Threshold (D06) are given as a percentage of Motor Rated Current (B02). Brake Control: Upper Current Threshold (D06) should be set to the current
level that indicates that there is magnetizing current and sufficient torque producing current in the motor to deliver the required amount of torque when
the brake is released. The output of the comparator remains active after this level has been reached unless the current subsequently falls below
Brake Control: Lower Current Threshold (D07) which should be set to the required level to detect the condition where the motor has been
disconnected from the drive. If Brake Control: Lower Current Threshold (D07) ≥ Brake Control: Upper Current Threshold (D06) then the upper
threshold applies with a hysteresis band of 0. If Brake Control: Lower Current Threshold (D07) = Brake Control: Upper Current Threshold (D06) = 0
then the output of the comparator is always one.
The Current Magnitude, Total Output Current (J22) is compared to an upper and lower threshold by a comparator with hysteresis to give torque
present and drive output open detection functions respectively. Brake Control: Lower Current Threshold (D07) and Brake Control: Upper Current
Threshold (D06) are given as a percentage of Motor Rated Current (B02). Brake Control: Upper Current Threshold (D06) should be set to the current
level that indicates that there is magnetising current and sufficient torque producing current in the motor to deliver the required amount of torque when
the brake is released. The output of the comparator remains active after this level has been reached unless the current subsequently falls below
Brake Control: Lower Current Threshold (D07) which should be set to the required level to detect the condition where the motor has been
disconnected from the drive. If Brake Control: Lower Current Threshold (D07) ≥ B
rake Control: U
pper Current Threshold (D06) then the upper
threshold applies with a hysteresis band of 0. If Brake Control: Lower Current Threshold (D07) = Brake Control: Upper Current Threshold (D06) = 0
then the output of the comparator is always one.
Open-Loop
The frequency comparator is used on starting, to detect when the motor frequency has reached a level where the motor can produce the required
amount of torque to ensure that the motor rotates in the demanded direction when the brake is released. Brake Control: Brake Release Frequency
(D08) should be set to a level slightly above the motor slip frequency that is likely to occur under the highest expected load that is applied to the motor
when the brake is released.
The brake apply frequency threshold is used to ensure that the brake is applied before the motor frequency reaches zero and to prevent the motor
rotating (in the reverse direction due to an overhauling load for example) during the brake apply time. If the frequency falls below Brake Control: Brake
D05 Brake Control Apply Delay
Mode Open-Loop, RFC-A, RFC-S
Minimum 0 Maximum 10000
Default 500 Units ms
Type 16 Bit User Save Update Rate Background
Display Format Standard Decimal Places 0
Coding RW
D06 Brake Control: Upper Current Threshold
Mode Open-Loop
Minimum 0 Maximum 200
Default 10 Units %
Type 8 Bit User Save Update Rate 4 ms read
Display Format Standard Decimal Places 0
Coding RW, BU
D07 Brake Control: Lower Current Threshold
Mode Open-Loop RFC-A, RFC-S
Minimum 0 Maximum 200
Default 10 Units %
Type 8 Bit User Save Update Rate 4 ms read
Display Format Standard Decimal Places 0
Coding RW, BU
D08 Brake Control: Brake Release Frequency
Mode Open-Loop RFC-A, RFC-S
Minimum 0.0 Maximum Open-Loop: 20.0
Default Open-Loop: 1.0 Units Hz
Type 8 Bit User Save Update Rate 4 ms read
Display Format Standard Decimal Places 1
Coding RW, BU
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