YASKAWA CIMR-ZU A Series Programming Manual page 124

1 8 L Protection Functions
Settin Disabled
No carrier frequency reduction at high current.
Settin 1 Enabled or Output Fre uencies belo
The carrier frequency is reduced at speeds below 6 Hz when the current exceeds 100% of the drive rated current. The drive
returns to the normal carrier frequency when the current falls below 88% or the output frequency exceeds 7 Hz.
Settin 2 Enabled or Entire Fre uency an e
The carrier frequency is reduced at the following speeds:
• Below 6 Hz when the current exceeds 100% of the drive rated current.
• Above 7 Hz when the current exceeds 112% of the drive rated current.
The drive uses the delay time set in parameter L8-40 and a hysteresis of 12% when switching the carrier frequency back to
the set value.
L8 Carrier Fre uency eduction O Delay ime
Sets a hold time before returning to the original carrier frequency setting after the carrier frequency has been temporarily
derated as determined by L8-38. The carrier frequency reduction function is disabled when this value is 0.00 s.
No
L8-40
L8 1 i Current Alarm Selection
Triggers a high current alarm (HCA) when the output current exceeds 150% of the drive rated current.
No
L8-41
Settin Disabled
No alarm is detected.
Settin 1 Enabled
An alarm is triggered when the output current exceeds 150% of the drive rated current. A digital output set for an alarm
(H2- = 10) will close.
L8 7 Carrier Fre uency eduction ate durin o Pre Alarm
Derates the carrier frequency to the level set to L8-39 during oH pre-alarm.
No
L8-97 Carrier Frequency Reduction Rate during oH Pre-Alarm
Settin Disabled
Settin 1 Enabled
12
Name
Carrier Frequency Reduction Off-Delay Time
Name
High Current Alarm Selection
Name
Settin an e
0.00 to 2.00 s
Settin an e
0, 1
Settin an e
0, 1
De ault
0.50 s
De ault
0
De ault
0