YASKAWA CR700

3.10 Crane Application Setup Procedure
196 YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
■ Related Parameters
Table 3.13 Parameters for the Brake Sequence
No. Name Adjustment Method
S1-01 Brake Release Frequency(FWD)
Set a value that is lower than S1-03, but higher than b2-01 [DC Injection/Zero SpeedThreshold] and E1-
09 [Minimum Output Frequency].
• Closed Loop Vector Control
Usually, used at 0 Hz.
If slipping occurs when starting to hoist the load in a crane that does not use a counterweight, then set
a high value in S1-09.
• Open Loop Vector Control Method
Set a value that is 1.0 to 1.5 times the motor rated slip.
• V/f Control Mode
Because it is difficult to ensure enough torque in V/f Control, set a value that is 1.5 to 2.0 times the
motor rated slip.
S1-02 Brake Release Frequency(REV)
S1-03 Brake Delay Frequency
Set a value that is equal to S1-01 and S1-02, or a value that is higher than S1-01 and S1-02.
• Closed Loop Vector Control
Usually, used at 0 Hz.
However, if the 1-notch reference is 1 Hz or less, then SE2 [Brake Sequence Fault 2 (SE2)] may occur
due to the lack of current flowing through the motor at start. In such cases, decrease the setting as low
as 0.5 Hz.
• OLV Control, V/f Control
Set with the target value as the motor rated slip plus 1 Hz.
Note:
If the setting value is too high, shock will likely occur during startup. If the setting value is too low,
then SE2 [Brake Sequence Fault 2 (SE2)] may occur due to the lack of current flowing through the
motor at start.
S1-04
Brake Delay Time
Sets a delay time from when the Brake release command is issued until the brake is actually released.
S1-05 Brake Release Current (FWD)
• CLV Control, OLV Control
Set E2-03 [Motor No-Load Current] × 100 / E2-01 [Motor Rated Current].
• V/f Control Mode
For hoisting, set S1-05 = 100%, S1-06 = 50%. For traveling, set 50%.
Note:
• If the load differs when operating forwards and in reverse, then change the setting appropriately to
match the load.
• If the setting value is too low for hoisting the load, then load slips will likely occur at start.
• If the setting value is too high, then SE2 [Brake Sequence Fault 2 (SE2)] may occur, and the brake
may slip just before it is released.
S1-06
Brake Release Current (REV)
S1-07
*1
Brake Release Torque (FWD)
For hoisting, set S1-07 = 100%, S1-08 = 0%. For traveling, set 50%. (If the load differs when operating
forwards and in reverse, then change the setting appropriately to match the load.)
Note:
• If there is fair amount of lurching out, set 70 - 80% for hoisting the load.
• If the setting value is too low, then load slips will likely occur at start.
• If the setting value is too high, then SE2 [Brake Sequence Fault 2 (SE2)] may occur, and the brake
may slip just before it is released.
S1-08
Brake Release Torque (REV)
S1-09
*2
Torque Compensation (FWD)
• Closed Loop Vector Control
Usually, set to S1-09 = 0, S1-10 = 0. Refer to the descriptions for S1-01 and S1-02. If the drive is too
slow in outputting the Brake release command or slipping occurs at start, then set a high value.
• Open Loop Vector Control Method
Here, the drive does not use torque compensation, but instead uses torque forcing. If the drive is too
slow in outputting the Brake release command, then set a high value. Lower this setting if machine
shock occurs at start. If the load slips when starting to hoist it, then set S1-09 to a high value. However,
be sure to also set L7-01 [Forward Torque Limit] to the upper limit.
S1-10
*2
Torque Compensation (REV)
S1-11
*2
Torque Compensation Delay Time
Usually, set to 50 ms. Sets the time for torque compensation to build up until the brake is actually
released.
S1-12 Brake Hold Frequency (FWD)
Usually, set to the value of S1-14 + 3 to 4 Hz. For a higher degree of precision, set this parameter using
the following formula.
S1-12 and S1-13 = (Delay time until the brake is actually released) × (Maximum output frequency /
Deceleration time)
S1-13 Brake Hold Frequency (REV)
S1-14 Slip Prevention Frequency
Usually, set to the same value as S1-03.
S1-15 Slip Prevention Time
Sets a delay time until the brake is actually closed after the Brake close command is ON.
S1-16 Sequence Fault SE1 Detect Time -
S1-17 Sequence Fault SE2 Detect Time -
S1-18 Sequence Fault SE3 Detect Time -
S1-19 Sequence Fault SE4 Detect Time -
S1-20
*3
Operation in Reverse
If oscillation occurs when lowering in a hoist/lowering crane without a counterweight, set S1-20 = 1.
Note:
If used with the motor alone (without the load attached), then shock will occur. There should be
problem if set so that S1-20 = 0.
S1-22
DB Phase Fix -
S1-54 Brake Sequence Selection
Enables and disables the brake sequence.
0: Disabled
1: Enabled