YASKAWA CR700

3.10 Crane Application Setup Procedure
200 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
■ V/f Control Mode
S1-01 - Brake Release Frequency(FWD)
S1-02 - Brake Release Frequency(REV)
S1-03 - Brake Delay Frequency
S1-04 - Brake Delay Time
S1-05 - Brake Release Current (FWD)
S1-06 - Brake Release Current (REV)
S1-07 - Brake Release Torque (FWD)
S1-08 - Brake Release Torque (REV)
S1-12 - Brake Hold Frequency (FWD)
S1-13 - Brake Hold Frequency (REV)
S1-14 - Slip Prevention Frequency
S1-15 - Slip Prevention Time
b2-01 - DC Injection/Zero SpeedThreshold
E1-09 - Minimum Output Frequency
■ Sequence at Startup
To prevent the load from suspension drops at startup, the brake is released only after checking that enough torque
is generated to hold the load in place.
Description of Operation
1. Once the Run command is input (either the Forward run command or the Reverse run command is switched
ON), the drive will accelerate the motor up to S1-03 [Brake Delay Frequency], with the brake still clamped
shut. At this time, the amount of torque compensation (or the amount of torque forcing) is input that
corresponds to the setting value.
Note:
In Open Loop Vector, the drive uses torque forcing instead of torque compensation.
2. After verifying that all of the following conditions have been satisfied, the drive switches ON the Brake
Release command (BR). Once the Brake Release command is ON, the Brake Release Check (BX) switches
ON through an external sequence.
• Output frequency after a soft start ≥ S1-01, S1-02 [Brake Release Frequency]
• Drive output current > S1-05, S1-06 [Brake Release Current]
• In Vector control, the drive torque reference ≥ S1-07, S1-08 [Brake Release Torque]
Note:
The brake release frequency, brake release current, brake release torque, and the brake close frequency all need to be set separately for
forward and reverse operation.
3. After accelerating up to S1-03 [Brake Delay Frequency], the drive will operate at that frequency for the time
set in S1-04 [Brake Delay Time]. Once the time in S1-04 passes, the drive accelerates up to the frequency set
to terminal A1. When S1-04 = 0, the drive will not stop acceleration at the value set in S1-03.
■ Stop Sequence
To prevent the load from slipping when the motor is stopped, enough torque needs to be generated to hold the load
in place until the brake is fully closed.