Hitachi L300P Series service manual Trouble Shooting, Inverter trip contents, remedy, advice

2. TROUBLE SHOOTING

2.1 Inverter trip contents, remedy, advice

Trip

contents

Digital operator display

Remedy, advice

It’s

one of

INV

failure

by locked

While

constant

Load changed rapidly.

motor,

fast

ACC/DEC because big

Short circuit or earth contact (ground

current will be flown.

speed

fault) in the motor or the motor cable.

By over current detection, INV will

shut the output by the hardware.

This detection will be done by AC

While

If fast deceleration is happening

Over

current

detection

at

CT.

deceleration

preset Decel time longer

Over current will be detected about

If fast acceleration is happening

output stage

200% of rated level on SJ300.

While

preset Accel time longer

Over current will be detected about

acceleration

Any motor locked, check the wires

150% of rated level on L300P.

High preset torque boost, reduce the

value

others

Is the preset DC injection brake level

high

Any CT malfunction, any noise

INV is monitoring the output current, if the connected

motor

was overload conditions,

INV will detect

the

overload, if the level was exceeded preset level, INV

will shut the output.

(E-thermal characteristic has deleting characteristic by

Too heavy load

Over

load

detection

at

the output freq. If the freq. Is less than 5Hz, it has more

Thermal level proper ?

chance to have the trip.

Perform above adjustment referring

output stage(with motor)

Over current will be detected about 200% of rated level

to d104, to reduce the electronic

on SJ300.

thermal level.

If the load has big inertia moment, while ACC, there is a

possibility to disturb the ACC by the detection.

In this case, adjust torque boost if v/f control is

selected.

This

detection

is

over

voltage

detection,

but

the

Any fast decel

condition is different from the normal over voltage trip.

Over

voltage detection

Busy running cycle

The

difference

is

below. If the

preset BRD %ED

Preset BRD%ED proper ? low ?

after BRD %ED was run

level(d090) was run out, BRD circuit can not work and if

Perform above adjustment referring

out

DC bus voltage will detect the over voltage level, INV

to d103, to reduce the BRD usage

will shut the output.

ratio.

If DC bus voltage is exceeded specific level by

Any fast decel

generating energy from the connected motor, high

Earth contact (ground fault) in the

Over voltage detection (DC

incoming AC voltage, INV will shut the output.

motor or the motor cable.

The DC bus voltage level is

Any back energy from the load

bus voltage)

About 400VDC (200V class)

Perform above adjustment referring

About 800VDC (400V class)

to d102, so that the DC bus voltage

does not exceed the trip level.

INV uses EEPROM to preset parameters, if the

EEPROM

was

affected

by external

noise,

abnormal

Any big noise near the INV

EEPROM (contradiction)

heat, micro processor will detect the contradiction such

Ambient temp. is too high.

as sum check , INV will shut the output.

If DC bus voltage is low, INV can’t work properly

Any incoming AC V drop

Under

voltage(DC bus

especially control circuit, in this case,

INV will shut the

Sufficient power capacity

output.

Any thyristor failure

voltage)

The DC bus voltage level is

Perform above adjustment referring

About 200VDC or less(200V class)

to d102, so that the DC bus voltage

About 400VDC or less(400V class)

does not exceed the trip level.

INV uses CT to detect motor current, if the CT outputs

CT offset

unusual offset level while INV stop, INV will shut the

Any high offset signal of the CT

output.

The voltage level is about 0.6V or more.

CPU(micro processor mis-			If built in Micro processor works improper, if it detects	Any big noise near the INV
			failure, INV will shut the output.
operation)				Micro processor failure
			If the intelligent terminal detects the input signal from
External(customer’s
			external devices, INV will shut the output. This	Check	the	configuration,	signal,
selection)			function/trip is customer ’s selection. If EXT function is	wiring, conditions
			not selected, there is no chance to have the trip.
USP(US version default or			If INV is ready to start at power on, INV will shut the
			output. This function/trip is customer’s selection. If USP	Check the configuration,signal, wiring,
customer’s selection)			function is not selected, there is no chance to have the	conditions
			trip.
Ground default at power on			Only at power on, INV will detect ground fault between	Earth	contact	(ground fault)	in the
			INV and the connected motor, INV will shut the output. If
				motor or the motor cable. ,			IGBT
at output stage			the motor remaining voltage exists, this detection
				failure
			doesn’t work.
			If DC bus voltage is continuously exceeding specific	Any high incoming voltage			except
Incoming	over	voltage	level more than 30 sec, INV will shut the output.
			The DC bus voltage level is	deceleration
detection
			About 380VDC or above (200V class)	implement input ACL

About 760VDC or above (400V class)

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