Despite Measures To Increase Flux, Brake Operation Is Slow And Peak Current At Start Take Too Long; Excessive Current Flow When Starting To Hoist Immediately After Stopping; Lowering; Brake Slips At Start - YASKAWA CIPR-CR70A Series Technical Manual

3 Startup Procedure and Test Run
■
Despite Measures to Increase Flux, Brake Operation Is Slow and Peak Current at Start
Take Too Long
Causes
S1-04 = 0.00 [Brake Delay Time = 0.00 s].
The setting value of S1-07 [Brake Release Torque (FWD)]
is too low while using Open Loop Vector Control, Closed
Loop Vector Control, or Advanced Open Loop Vector
Control.
The V/f setting is too high.
■
Excessive Current Flow When Starting to Hoist Immediately After Stopping Lowering
Causes
Depends on motor characteristics.
■

Brake Slips at Start

Causes
S1-04 = 0.00 [Brake Delay Time = 0.00 s].
The setting values of S1-05 [Brake Release Current
(FWD)], S1-06 [Brake Release Current (REV)], S1-07
[Brake Release Torque (FWD)], and S1-08 [Brake Release
Torque (REV)] are too high.
The V/f setting is too high.
■

Brake Grinding Occurs at Stop

Causes
The setting values of S1-12 and S1-13 [Brake Hold
Frequency] are too high.
The setting value of S1-14 [Slip Prevention Frequency] is
too high.
The setting value of S1-15 [Slip Prevention Time] is too
high.
The setting value of b2-04 [DC Inject Braking Time at
Stop] is too high.
■

Impact Stop Is Not Available After the Motor Stops

Causes
The setting values of S3-03 [Impact Stop Detect Torque
(FWD)] and S3-04 [Impact Stop Detect Torque (REV)] are
too low.
The value set in S3-05 [Impact Stop Detection Time] is too
low.
212
Possible Solutions
Set S1-04 ≒ 0.30 to 0.70.
Set S1-07 ≒ 70 to 80.
Decrease the V/f setting.
Possible Solutions
Use the following formula to set S2-03 [Run Cmd Delay Timer (REV/
FWD)].
Note:
Refer to the following parameters to get the information required for the
necessary calculations.
• E2-01 [Motor Rated Current (FLA)]
• E2-02 [Motor Rated Slip]
• E2-03 [Motor No-Load Current]
Possible Solutions
Set S1-04 ≒ 0.30 to 0.70.
Decrease the setting values of S1-05 to S1-08. Set S1-07 ≒ 70 to 80.
Decrease the V/f setting.
Possible Solutions
Decrease the setting values of S1-12 and S1-13.
Decrease the setting value of S1-14.
Decrease the setting value of S1-15.
Set b2-04 < 0.5 [DC Inject Braking Time at Stop < 0.50 s].
Possible Solutions
Increase the setting value of S3-03 and S3-04.
Increase the setting value of S3-05.
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual