Yaskawa UL4 fault code meaning
Yaskawa / UL4
Series: A1000, FP60B, GA500, GA700, H1000, L1000A, T1000V, U1000, V1000
Insufficient torque detection 2
drive
Meaning:
Possible causes
Source: A1000 Series Quick Start Guide P108; FP60B Technical Manual P197; GA500 Technical Manual P310; GA700 Technical Manual P379; H1000 Series Technical Manual P320; L1000A Series Quick Start Guide P118; T1000V Series Technical Manual P237; U1000 Series Technical Manual P356; V1000 Series Technical Manual P247
Series: ES700
Undertorque detection 2
drive
Meaning:
Possible causes
Source: ES700 Technical Manual P320
Series: L7
Insufficient torque detection 2
drive
Meaning: The drive output current (V/f control) or output torque (vector control) remains below the setting (L6-05) for longer than the specified time (L6-06); detection is performed when L6-04 is set to 7 or 8; insufficient motor torque
Possible causes
Source: Yaskawa L7 Series Elevator Drive User Manual, Fault Diagnosis P262