CHINT NVF2G-S Series User Manual

Possible causes of damage: bearing wear, blade aging.
Judgment criteria: Whether there are cracks in the fan blades, etc., and whether there is abnormal vibration
sound when the machine is turned on.
(2) filter electrolytic capacitor
Possible damage reasons: high ambient temperature, frequent load jumps cause increased pulsating current,
and electrolyte aging.
Judgment criteria: whether there is liquid leakage, whether the safety valve has protruded, the measurement
of electrostatic capacitance, and the measurement of insulation resistance.
(3) Relay
Possible causes of damage: corrosion, frequent movement.
Judgment criteria: open and close failure.
10.6 Troubleshooting
The possible fault types of the inverter are summarized in Table 10.3. Before seeking service, users can
conduct self-examination according to the prompts in the table, and record the fault phenomenon in detail.
When seeking service, please contact the seller.
Table 10.3 Fault types
Choose a frequency converter with a
large power rating
error code
Fault type
Possible cause of failure
Countermeasures
E.OC1
Inverter
acceleration
running
over-current
1. The grid voltage is low
Check input power
2. Direct and quick start during motor
rotation
Start the motor after stopping
3. Acceleration time is too short Extend acceleration time
4. Motor parameters are not accurate
Carry out parameter auto-tuning on
the motor
5. When PG is running, the code disc is
faulty
Check code wheel and its wiring
6. The inverter power is too small
Choose a frequency converter with a
large power rating
7. The V/F curve is not suitable
Adjust the V/F curve setting, adjust
the manual torque boost
E.OC2
Inverter
deceleration
running
over-current
1. The grid voltage is low
Check input power
2. The deceleration time is too short Extend deceleration time
3. Potential energy load or load inertia
torque is large
plus suitable dynamic braking
components
4. When PG is running, the encoder is faulty
Check the encoder and its wiring
5. The inverter power is too small
E.OC3
Inverter
running at
constant speed
over-current
1. The acceleration and deceleration time
setting is too short
Appropriately extend the acceleration
and deceleration time
2. Load mutation or abnormality
Do a load check
3. The grid voltage is low
Check input power
4. When PG is running, the encoder is faulty
Check the encoder and its wiring
5. The inverter power is too small
Choose a frequency converter with a
large power rating
E.OV1
Inverter
acceleration
operation
overvoltage
1. Motor short circuit to ground
Check motor connection
2. Abnormal input voltage
Check input power
3. The motor starts quickly again during
high-speed rotation
Start the motor after stopping
4. Acceleration time is too short Extend acceleration time
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NVF2G-S Series Inverter User's Guide

CHINT NVF2G-S Series Specifications

General

Brand	CHINT
Model	NVF2G-S Series
Category	Inverter
Language	English