Yaskawa AC Drive Z1000 Bypass Technical Manual Manual do Utilizador descarregar pdf (Página 244)

The motor is short-circuited

• Check the motor power cable, relay terminals and motor terminal box for short circuits.

• Correct grounding shorts and turn the power back on.

Ground current has overcharged the main circuit

capacitors via the drive input power

Noise interference causes the drive to operate

incorrectly

• Review possible solutions for handling noise interference.

• Review section on handling noise interference and check control circuit lines, main circuit lines

and ground wiring.

• If the magnetic contactor is identified as a source of noise, install a surge protector to the MC coil.

Set number of fault restarts (L5-01) to a value other than 0.

HOA Keypad Display Minor Fault Name

PASS MEMOBUS/Modbus Comm. Test Mode Complete

Cause Possible Solutions

MEMOBUS/Modbus test has finished normally This verifies that the test was successful.

HOA Keypad Display Minor Fault Name

SAFE

Customer Safety

Customer Safeties mult-function input is open. This alarm has display priority over the Interlock Open

(inTLK).

Cause Possible Solutions

External contact from customer wiring is open. Check the cause of the open safety.

HOA Keypad Display Minor Fault Name

SE MEMOBUS/Modbus Communication Test Mode Error

Cause Possible Solutions

A digital input set to 67H (MEMOBUS/Modbus

test) was closed while the drive was running

Stop the drive and run the test again.

HOA Keypad Display Minor Fault Name

TrPC

IGBT Maintenance Time (90%)

IGBTs have reached 90% of their expected performance life.

Cause Possible Solutions

IGBTs have reached 90% of their expected

performance life

Replace the drive.

HOA Keypad Display Minor Fault Name

UL3

Undertorque Detection 1

Drive output current less than L6-02 for longer than L6-03 time.

Cause Possible Solutions

Inappropriate parameter settings Check parameters L6-02 and L6-03.

Load has dropped or decreased significantly Check for broken parts in the transmission system.

HOA Keypad Display Minor Fault Name

UL6 Undertorque Detection 6

Cause Possible Solutions

The load has dropped or decreased under the motor

underload curve

Check parameters L6-13 and L6-14.

HOA Keypad Display Minor Fault Name

Undervoltage

One of the following conditions was true when the drive was stopped and a Run command was

entered:

• DC bus voltage dropped below the level specified in L2-05.

• Contactor to suppress inrush current in the drive was opened.

• Low voltage in the control drive input power. This alarm outputs only if L2-01 is not 0 and DC

bus voltage is under L2-05.

Cause Possible Solutions

Phase loss in the drive input power Check for wiring errors in the main circuit drive input power. Correct the wiring.

6.5 Alarm Detection

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