Sourcetronic ST600 - Page 261

Frequency Inverter ST600 Series High-Performance Multifunction VFD Troubleshooting
-254-
protection
OV1
[7] Overvoltage during
acceleration
Deceleration time is too short;
Exception occurred to input
voltage;
Large energy feedback;
Lack of brake units;
Dynamic brake is not enabled, and
the deceleration time is too short.
Check input power;
Check whether load
deceleration time is too short;
or the motor starts during
rotating;
Install dynamic brake units;
Check the setup of related
function codes
OV2
[8] Overvoltage during
deceleration
OV3
[9] Overvoltage during
constant speed running
OC1
[4] Overcurrent during
acceleration
Acceleration is too fast;
Grid voltage is too low;
VFD power is too small;
Load transient or exception
occurred;
To-ground short circuit or output
phase loss occur;
Strong external interference
sources;
Overvoltage stall protection is not
enabled
Increase ACC/DEC time;
Check input power;
Select the VFD with larger
power;
Check if the load is short
circuited (to-ground short
circuit or line-to-line short
circuit) or the rotation is not
smooth;
Check the output wiring;
Check if there is strong
interference;
Check the setup of related
function codes.
OC2
[5] Overcurrent during
deceleration
OC3
[6] Overcurrent during
constant speed running
UV
[10] Bus undervoltage
fault
Grid voltage is too low;
Overvoltage stall protection is not
enabled
Check grid input power;
Check the setup of related
function codes
OL1
[11] Motor overload
Grid voltage is too low;
Rated motor current is set
improperly;
Motor stall or load jumps violently
Check grid voltage;
Reset rated motor current;
Check the load and adjust
torque boost
OL2
[12] VFD overload
Acceleration is too fast;
The motor in rotating is restarted;
Grid voltage is too low;
Load is too large;
Power is too small;
Increase acceleration time;
Avoid restart after stop;
Check grid voltage;
Select the VFD with larger
power;
Select proper motor
SPI
[13] Phase loss on input
side
Phase loss or violent fluctuation
occurred to R, S and T input
Check the input power;
Check installation wiring
SPO
[14] Phase loss on output
side
Phase loss occurred to U, V, W
output (or the three phases of
motor is asymmetrical)
Check the output wiring;
Check the motor and cable
OH1
[15] Overheat of rectifier
module
Air duct is blocked or fan is
damaged;
Ambient temperature is too high;
Long-time overload running
Ventilate the air duct or
replace the fan;
Lower the ambient
temperature
OH2
[16] Overheat of inverter
module