Light-Load Acceleration 1 Function - YASKAWA CR700 Technical Manual

Description of Operation
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S3-01 - Impact Stop Creep Frequency
S3-02 - Impact Stop Creep Time
S3-03 - Impact Stop Detect Torque (FWD)
S3-04 - Impact Stop Detect Torque (REV)
S3-05 - Impact Stop Detection Time
In the situations listed below, the output frequency is the value set in S3-01, and the run time is the value set in S3-02.
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• When the drive torque reference is less than S3-03 or S3-04 (in OLV control)
• When the drive torque reference is less than S3-03 or S3-04 (in V/f control)
1. If the Impact Stop Enable command (H1-xx = 35) is switched ON and the output frequency is greater than or
equal to S3-01, then once the Stop command is entered (meaning that the Forward run command or Reverse
run command is switched OFF), then the drive will decelerate to the value set in S3-01.
2. The motor will decelerate if the torque reference (the output frequency in V/f Control) is lower than or equal
to the value set in S3-03 (or the value set in S3-04 if operating in reverse) for the time set in S3-05 or longer
while operating at the speed set in S3-01. Consequently, once the output frequency reference reaches the value
set in S1-01 [Brake Release Frequency(FWD)] (in reverse, S1-02 [Brake Release Frequency(REV)]), then the
terminal set to H2-xx = 21 [Brake Release Command] will shut OFF from an external circuit. Once the Brake
release command (BR) turns OFF, then the terminal set to H1-xx = 0 [Brake Release Check] turns OFF from
an external circuit.
3. If both of the above 2 conditions are not met and the time set in S3-02 passes, then the Brake Release
Command (BR) will switch OFF. Once the Brake Release Command (BR) turns OFF, then the terminal set to
the Brake Release Check (BX) will turns OFF using an external sequence.
4. If the Impact Stop Enable command is switched OFF during Impact Stop operation, then the drive will
interrupt the Impact Stop function, and switch OFF the Brake Release Command (BR). Once the Brake
Release Command (BR) turns OFF, then the terminal set to the Brake Release Check (BX) will turns OFF
using an external sequence.

Light-load Acceleration 1 Function

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This function monitors how high the drive torque reference and output current get. If the drive detects that the
load is light, then it will increase the frequency reference. This shortens the operation time.
This function allows the drive to accelerate up to the frequency reference given when the drive detects that it is
working with a light load. Even with a light load, the drive will not accelerate above the frequency reference input
to the drive.
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
3.10 Crane Application Setup Procedure
S1-12 - Brake Hold Frequency (FWD)
S1-13 - Brake Hold Frequency (REV)
S1-14 - Slip Prevention Frequency
S1-15 - Slip Prevention Time
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