Specifications

YASKAWA Inverter Drive A1000 – Crane Software Application Manual
38
(1) When a RUN Command is entered (FWD or REV), the drive will accelerate up to the Brake Delay Frequency BF
with the brake clamped shut. If Torque Compensation is enabled, it will be applied at this time.
(2) After ALL three conditions listed below are met, the Brake Release Command BR relay will close. The drive
expects that in a time frame shorter than the S1-18 parameter a Brake Release Check BX feedback signal will be
received from external circuitry to confirm that the brake has been opened, or a brake sequence fault will be
triggered.
Conditions that must be met before the Brake Release Command BR relay will close and the brake opens (AND Conditions)
Drive Output Frequency ≥ Brake Release Frequency FRF (RRF)
Drive Output Current ≥ Brake Release Current IF (IR)
Drive Internal Torque Reference ≥ Brake Release Torque TF (TR) *
* This condition must only be met in vector control modes.
If these conditions are not met in a time frame shorter than S1-17, a brake sequence fault (SE2) will be triggered. If SE2
is disabled, the drive will hold at the Brake Delay Frequency BF indefinitely waiting for the conditions to be met and the
brake will remain clamped shut.
(1) Once the Brake Release Check BX signal has been received, the drive will hold output frequency at the Brake
Delay Frequency BF until the Brake Delay Time BT expires. Then the drive will accelerate to the main frequency
reference. If BT is set to zero, then the drive will ramp directly to the main frequency reference.
Note: Brake Release Frequency, Current, and Torque values can be set individually for FWD and REV directions.