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3 Startup Procedure and Test Run
Note:
If the speed reference entered from terminal A1 slowly changes, then the following operation will be executed after the Brake release
command is switched OFF.
• For forward run, the drive operate at the speed reference from S1-01 [Brake Release Frequency(FWD)] and S1-12 [Brake Hold
Frequency (FWD)], whichever is larger, until the Run command is switched OFF.
• For reverse run, the drive operate at the speed reference from S1-02 [Brake Release Frequency(REV)] and S1-13 [Brake Hold
Frequency (REV)], whichever is larger, until the Run command is switched OFF.
• Even after the brake is engaged, because the drive will continue to run the motor until the Run command is switched OFF, makes sure
that the speed reference input from terminal A1 drops to 0 within 100 ms before the output frequency reaches S1-12, S1-13. Failing to
make this setting can cause the brake to slip.
Sequence Fault Monitoring Function
If a brake sequence error is detected, then the drive will switch OFF the brake release command, perform
baseblock, and trigger a fault relay output. Refer to the parameters used to set up the detection time, and to the
chapter on Troubleshooting for details.
Code
Name
SE1
Brake Sequence
A forward and a reverse command were
Fault 1 (SE1)
input simultaneously.
SE2
Brake Sequence
The motor is not connected and the
Fault 2 (SE2)
current does not flow. The break release
command (BR) does not turn ON.
The brake release current and torque
setting value is too high.
Brake grinding occurs and it does not
reach the brake release torque.
SE3
Brake Sequence
Sequence Error of the Brake Circuit.
Fault 3 (SE3)
The response (scan) of the Sequence
circuit is slow.
Loose connection or disconnection of the
relay, electromagnetic contactor and
brake.
SE4
Brake Sequence
The break release check (BX) turns ON
Fault 4 (SE4)
when the break release command (BR) is
OFF.
Loose connection or disconnection of the
relay, electromagnetic contactor and
brake.
Note:
The following settings will keep the drive from detecting a sequence error. The function for detecting sequence errors should usually be
enabled to ensure that the brake operates properly.
• If none of the MFDIs are set to the Brake release check signal, then the drive will detect an SE3 or SE4 error.
• No sequence error detection will occur if the detection times in parameters S1-16 to S1-19 are set to 0.00.
■
Adjusting the Run Command
Run Command Minimum On Time Function
If the input time for the Run command is shorter than the settings in S2-01 [Run Cmd Minimum On Time (FWD)],
S2-02 [Run Cmd Minimum On Time (REV)], then the drive will hold the Run command only for the time set in
S2-01 and S2-02.
Related Parameters
No.
Name
S2-01
Run Cmd Minimum On Time (FWD)
S2-02
Run Cmd Minimum On Time (REV)
Description of Operation
The following is a description of the operation performed when S2-01 ≠ 0, S2-02 ≠ 0.
180
Table 3.14 Sequence Fault Table
Cause
Examine the forward and reverse
command sequence circuit.
Examine the motor circuit.
Decrease the parameter setting values
appropriately for the load.
Examine the brake torque.
Examine the sequence circuit of brake
release check signal (BX).
Examine the relay, electromagnetic
contactor and brake.
Examine the sequence circuit of brake
release check signal (BX).
Examine the relays, electromagnetic
contactor, and brake, as well as the
wiring.
Increase this value if the drive control and brake operation do not operate as
expected during extremely quick inching operation and the load slips.
Increase the value if movement is unstable during extremely quick inching
operation.
YASKAWA ELECTRIC SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
Parameters for
Solution
Detection Time
Adjustment Method
S1-16
S1-17
S1-18
S1-19
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