LSIS S100 User Manual

Troubleshooting
235
7.2 Troubleshooting Fault Trips
When a fault trip or warning occurs due to a protection function, refer to the following table for
possible causes and remedies.
Type
Cause
Remedy
Over Load
The load is greater than the motor’s rated
capacity.
Ensure that the motor and inverter have
appropriate capacity ratings.
The set value for the overload trip level
(PRT-21) is too low.
Increase the set value for the overload
trip level.
Under Load
There is a motor-load connection problem.
Replace the motor and inverter with
models with lower capacity.
The set value for underload level (PRT-29,
PRT-30) is less than the system’s minimum
load.
Reduce the set value for the underload
level.
Over Current1
Acc/Dec time is too short, compared to load
inertia (GD2).
Increase Acc/Dec time.
The inverter load is greater than the rated
capacity.
Replace the inverter with a model that
has increased capacity.
The inverter supplied an output while the
motor was idling.
Operate the inverter after the motor has
stopped or use the speed search
function (CON-60).
The mechanical brake of the motor is
operating too fast.
Check the mechanical brake.
Over Voltage
Deceleration time is too short for the load
inertia (GD2).
Increase the acceleration time.
A generative load occurs at the inverter
output.
Use the braking unit.
The input voltage is too high.
Determine if the input voltage is above
the specified value.
Low Voltage
The input voltage is too low.
Determine if the input voltage is below
the specificed value.
A load greater than the power capacity is
connected to the system (e.g., a welder,
direct motor connection, etc.)
Increase the power capacity.
The magnetic contactor connected to the
power source has a faulty connection.
Replace the magnetic contactor.
Low Voltage2
The input voltage has decreased during the
operation.
Determine if the input voltage is above
the specified value.
An input phase-loss has occurred. Check the input wiring.
The power supply magnetic contactor is
faulty.
Replace the magnetic contractor.
Ground Trip
A ground fault has occurred in the inverter
output wiring.
Check the output wiring.
The motor insulation is damaged. Replace the motor.

LSIS S100 Specifications

General

Brand	LSIS
Model	S100
Category	DC Drives
Language	English