KITO ER2 Series User Manual

108
Troubleshooting (continued)
VFD
Symptom Cause Remedy Main factor Countermeasure
Electric chain hoist
does not operate.
VFD failure Reset the VFD by pressing Emergency
Stop button. It the VFD still does not
operate, check it.
VFD failure Check the error code
indicated by VFD
referring to the “VFD
Manual”.
Motor overheat Stop by motor thermal relay function of
the VFD
Motor resumes operation when the VFD
is reset by pressing the Emergency Stop
after cool down.
Operation exceeding
short time rating or
intermittent rating
Check the short time
rating and intermittent
rating. Use the electric
chain hoist within these
ratings.
VFD overheat Stop by overheat preventive function of
the VFD
Motor resumes operation when the VFD
is reset by pressing the Emergency Stop
after cool down.
Operation exceeding
short time rating or
intermittent rating
Check the short time
rating and intermittent
rating. Use the electric
chain hoist within these
ratings.
Expired service
life of the VFD
(capacitor)
Refer to the “VFD Manual”. Operation exceeding
short time rating or
intermittent rating
Check the short time
rating and intermittent
rating. Use the electric
chain hoist within these
ratings.
Interface Board
Symptom Cause Remedy Main factor Countermeasure
Electric chain hoist
does not operate.
Damaged circuit
component
Press the Push Button to check whether
LED on the board lights or not. If LED
does not light, replace the board.
* This test is carried out with energizing
the VFD. Be careful about electric shock.
Over current, over
voltage, service life
expiry
Operate the electric
chain hoist at the rated
voltage.
Replace the Interface
Board.
Contact failure of
connector
Check the conduction of the connector.
Replace the connector if it has no
conduction.
Defective assembling
of the connector
Crimp and insert
the connector pins
securely.
Braking Resistor
Symptom Cause Remedy Main factor Countermeasure
Electric chain hoist
does not operate.
Resistor breakage Measure the resistance of the resistor.
Replace the resistor if the resistance is
infinity.
Operation exceeding
short time rating or
intermittent rating, over
load
Use the electric chain
hoist within the ratings.
Chapter 3 Troubleshooting
3
VFD / Interface Board / Braking Resistor Troubleshooting

KITO ER2 Series Specifications

General

Control Voltage	24V
Duty Cycle	40% ED
Protection Class	IP55
Temperature Range	-20°C to +40°C
Type	Electric Chain Hoist
Frequency	50/60 Hz
Motor Insulation	Class F
Brake Type	Electromagnetic
Load Chain Grade	Grade 80
Ambient Temperature	-20°C to +40°C
Power Supply	3-phase
Lift Height	3 to 30 meters
Chain Falls	1 or 2
Voltage	200-240V, 380-480V