What causes Yaskawa GA500 fault oL1?

1. Load too large: Measure output current and compare with the motor nameplate; decrease the load. 2. Motor rated current or base frequency set wrong: Set E2-01 [Motor Rated Current (FLA)] and E1-06 [Base Frequency] to the motor nameplate values. 3. Low-speed operation of a self-cooled motor: Increase speed or reduce load at low speed, or use a drive-dedicated motor with L1-01 set to match. 4. Acceleration/deceleration or cycle times too short: Review cycle times and increase C1-01 to C1-08. 5. V/f pattern voltage too high: Adjust E1-04 to E1-10; the manual notes lowering E1-08 and E1-10 too far reduces low-speed overload tolerance. 6. One drive running several motors: Set L1-01 = 0 and fit a thermal overload relay to each motor, per the manual.

Yaskawa GA500 oL1 Motor Overload: Causes and Checks

Technical review pending. This guide is based on the cited manufacturer documentation; check it against the manual for your exact model and firmware before acting.

Fault oL1 on a Yaskawa GA500 is Motor Overload: the drive’s electronic thermal motor protection tripped. It can only be reset once U4-16 [Motor oL1 Level] is below 100. Yaskawa lists high load, short cycle times, low-speed running, a wrong L1-01 setting, a V/f pattern that does not suit the motor and a wrong base frequency.

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When it happens

Constant speed under sustained heavy load
Frequent starts and stops
Long running at low speed on a general-purpose motor

Likely causes and checks

1Load too large

Points to it: Trips after running a while; output current above motor FLA.
Check: Measure output current and compare with the motor nameplate; decrease the load.

2Motor rated current or base frequency set wrong

Points to it: Trips at normal load after commissioning.
Check: Set E2-01 [Motor Rated Current (FLA)] and E1-06 [Base Frequency] to the motor nameplate values.

3Low-speed operation of a self-cooled motor

Points to it: Trips only during long low-speed running.
Check: Increase speed or reduce load at low speed, or use a drive-dedicated motor with L1-01 set to match.

4Acceleration/deceleration or cycle times too short

Points to it: Trips on machines that start and stop frequently.
Check: Review cycle times and increase C1-01 to C1-08.

5V/f pattern voltage too high

Points to it: High current at low speed with light load in V/f control.
Check: Adjust E1-04 to E1-10; the manual notes lowering E1-08 and E1-10 too far reduces low-speed overload tolerance.

6One drive running several motors

Points to it: Multiple motors on one drive output.
Check: Set L1-01 = 0 and fit a thermal overload relay to each motor, per the manual.

Telling it apart

oL1 is the motor’s time-based overload. oL2 is the drive’s overload. oC is the instant overcurrent. oH3/oH4 come from a motor PTC thermistor input.
V1000 equivalence: the V1000 manual lists oL1 Motor Overload with the same reset condition (U4-16 below 100) and the same L1-01, E2-01, E1-06 and V/f checks.

Relevant parameters

Parameter	Name	Why it matters
E2-01	Motor Rated Current (FLA)	Set from the motor nameplate.
L1-01	Motor Overload (oL1) Protection	Selects the motor type; 0 disables (only with external relays).
U4-16	Motor oL1 Level	Must be below 100 before oL1 can be reset.
E1-06	Base Frequency	Set to the motor rated frequency.

Evidence to collect

U2-05 output current at fault and U4-16
E2-01, E1-06 and L1-01 settings against the nameplate
Duty cycle and running speed
Motor temperature and cooling

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Yaskawa GA500 fault oL1: Motor Overload