Overload Detection - YASKAWA CR700 Technical Manual

Type
If Light-load Acceleration 2 is enabled, when the frequency reference exceeds S4-08, the acceleration times = S4-17 × C1-01, C1-03, C1-05,
C1-07 [Acceleration Times], and the drive will monitor output power.
If the output power ≥ S4-09 then the drive will make acceleration even more gradual, and start the counter for the limit timer set in S4-13.
The drive will stop accelerating the motor if any of the following conditions arise, regardless of how much it has smoothed out acceleration
Motoring
already.
• Output power reached the level set in S4-10.
• The counter for Light-load Acceleration 2 reaches the value set for the limit timer in S4-13.
If the counter reaches the value set for the limit timer in S4-13 and acceleration is stopped, then the drive will not accelerate again until after
the motor has stopped.
If Light-load Acceleration 2 is enabled, then once the frequency reference exceeds S4-08, the acceleration times = S4-17 × C1-01, C1-03, C1-
05, C1-07, and the drive will monitor output power.
If the output power ≥ S4-11 then the drive will make acceleration even more gradual, and start the counter for the limit timer set in S4-13.
The drive will stop accelerating the motor if any of the following conditions arise, regardless of how much it has smoothed out acceleration
Regenerative operation
already.
• Output power reached the level set in S4-12.
• The counter for Light-load Acceleration 2 reaches the value set for the limit timer in S4-13.
If the counter reaches the value set for the limit timer in S4-13 and acceleration is stopped, then the drive will not accelerate again until after
the motor has stopped.
Note:
• The counter for the limit timer will be cleared once the output power falls below S4-09.
• Set S4-18 = 1 [L-L 2 Select during Regeneration = Enabled] to enable operation during regeneration.
• The following fault detection will occur if the output frequency > S4-08. The drive detects oL6 [Light-load Accel 2 Fault (oL6)] if the
output power is equal to or greater than the fault level set in S4-15 for the time set in S4-16 or longer. After the fault detection, the drive
follows the protective operation set in S4-14.
S4-14 Setting
Ramp to stop
0
1 Coast to stop
Emergency stop
2
Acceleration prohibited
3
Frequency deceleration
Decreases the output frequency only by the frequency set in S4-21. This
4
operation will repeat at the interval set by S4-16 for as long as the output
power ≥ S4-15.
*1 The keypad will display oL6 until the fault is reset.
*2 The keypad will flash oL6 until the Run command is switched OFF, and the motor stops. The keypad will continue to flash oL6 even
if you perform a fault reset.

Overload Detection

◆
This function limits drive operation depending on how high the drive torque reference or the output current is in
order to ensure safety. If the drive detects an overload situation, then it displays oL5 [Overload Detection (oL5)]
on the keypad. You can set 2 levels for overload detection, and 2 types of action to take after detecting overtorque.
Note:
1. The overload detection function is enabled only when the brake is released.
2. The overload detection function is disabled when the Run command source is set to the keypad.
Related Parameters
■
No.
S5-01 OverL Detect Operation Select 1
S5-04 OverL Detect Operation Select 2
S5-02 OverL Detect Operation Select 1
S5-05 Overload Detection Torque 2
S5-03 Overload Detection Time 1
S5-06 Overload Detection Time 2
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual
Operation after Detection
Table 3.20 Overload Detection Parameters
Name
Enables overload detection, and sets the conditions for detection as well as the operation to
perform after an overload situation is detected.
Sets the level to trigger an overload.
• V/f Control Mode
Sets the amount of current to detect overload as the motor rated current is 100%.
• OLV Control
Sets the amount of torque to detect overload as the motor rated torque is 100%.
If the motor current and motor torque exceed the value set in S5-02 for longer than the time set in
this parameter, then an overload will be detected.
If the motor current and motor torque exceed the value set in S5-05 for longer than the time set in
this parameter, then an overload will be detected.
3.10 Crane Application Setup Procedure
Operation
Mode
*1
Fault (triggers a fault relay output)
*2
Minor fault
-
Description
3
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