B&C Technologies SA Series Industrial - Manual (Page 75)

TROUBLE SHOOTING
7-15
11. “OLU” Overload protection
Problem Temperature inside inverter rose abnormally.
Possible Causes What to Check and Suggested Measures
1. Temperature around the
inverter exceeded that of
inverter specifications.
Measure the temperature around the inverter.
→ Lower the temperature (e.g., ventilate the enclosure well).
→ Lighten the load.
2. The service life of the
cooling fan has expired or
the cooling fan
malfunctioned.
Check the accumulated running time of cooling fan (E52 = 2).
Refer to “Reading Maintenance Information”.
→ Replace the cooling fan.
Visually check that the cooling fan rotates normally.
→ Replace the cooling fan.
3. Air vent is blocked.
Check if there is sufficient clearance around the inverter.
→ Increase the clearance.
Check if the heat sink is clogged.
→ Clean the heat sink.
4. Load was too heavy.
Measure the output current.
→ Lighten the load (e.g. lighten the load before overload occurs
using the overload early warning (E34).
→ Decrease the carrier frequency (F26).
→ Enable overload protection control (H70).
5. The acceleration /
deceleration time was too
short.
Recalculate the required acceleration / deceleration torque and time
from the moment of inertia for the load and the deceleration time.
→ Increase the acceleration / deceleration time (F07, F08, E10,
E11 and H54).
6. The wires to the motor are
too long and caused a
large amount of current to
leak from them. Measure the leak current.
→ Connect an output circuit filter (OFL).
12. “Er1” Memory error
Problem Error occurred in writing the data to the memory in the inverter.
Possible Causes What to Check and Suggested Measures
1. The power supply was
turned off when the
inverter was writing data
(especially initializing
data), and the remaining
control circuit voltage was
not high enough to enable
writing of data.
Check if pressing the PRG / RESET key resets the alarm after the
function code data are initialized by setting the data of H03 to 1.
→ Return the initialized function code data to their previous
settings, then restart the operation.