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Eq5 ac drive operations manual, 7) external thermal relay tripped, 8) inverter unit overload and motor overload – HP Anab EQ5 User Manual

Page 98

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EQ5 AC Drive Operations Manual

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TECO – Westinghouse Motor Company Trouble Shooting Chart 92

YES

YES

NO

Is PTC operating?

Incorrect motor load or
inadequate cooling.
Check the motor side.

External thermal relay tripped

OH2

Is PTC level
H27 set correctly?

Is PTC MODE
H26 enabled?

YES

NO

NO

Change to regular
external circuit.

Is the external circuit
(including constants)

regular?

Set to correct

value.

NO

YES

(7) External thermal relay tripped

YES

NO

Connect a thermal
O/L relay externally.

Is the electronic thermal
O/L relay setting correct?

Set to the correct level

Is the load excessive?

Inverter unit

overload OLU

Motor overload

OL1, OL2

Do the characteristics
of the electronic thermal
O/L relay and motor
overload match?

NO

NO

YES

YES

Reduce the load or
increase inverter

capacity

(8) Inverter unit overload and motor overload

NO

YES

NO

NO

Is the load excessive?

Reduce the load.

Is the cooling
fan rotating?

Replace the cooling fan.

Check the temperature of
the heatsink using the alarm
information displayed
on the keypad panel.

Remove obstacles.

Overtemperature

at inside air OH3

Does the heatsink
temperature indicate

-10Ž or lower?

YES

YES

YES

YES

Is the ambient
temperature within
the specification?

Arrange peripheral
conditions to meet
the specification.

Overheating

at heatsink OH1

NO

NO

Is the cooling air
passage blocked?

(6) Overtemperature at inside air
and overheating at heatsink.

YES

Connect the alarm
signal contact.

Is the alarm function
of the external
equipment operating

correctly?

YES

Remove the cause
of alarm function

activation.

NO

NO

Is data input to
the control terminals
THR-X1 to X9?

Are alarm signals from
external equipment
input to the terminals

and the CM?

Faulty inverter or error
due to noise, etc.
Contact TWMC.

Faulty inverter or error
due to noise, etc.
Contact TWMC.

Faulty inverter or error
due to noise, etc.
Contact TWMC.

Faulty inverter or error
due to noise, etc.
Contact TWMC.

Faulty detection
circuit on PCB.
Contact TWMC.

NO

YES

YES (30HP/CT, 40HP/VT

or less)

NO

YES

YES

NO

YES

NO

NO

YES

YES

NO

NO

YES

NO

NO

YES

Overtemperature at inside air

OH3

Overheating at

heatsink OH1

Is between the control
terminals 13-11 closed?

Check the temperature of
the heatsink using the alarm
information displayed
on the keypad panel.

Remove the short circuit.

Check the keypad panel
display.
Display limit or not?
30HP or less: 20 degrees C.

Is the cooling fan
for mixing inside air
rotating? (40HP/CT,
50HP/VT or more)

Is the peripheral
temperature of the
inverter –10 degrees C
or less ?

Is between the control
terminals 13-11 closed?

Faulty detection
circuit on PCB.
Contact TWMC

Make peripheral
temperature of the
inverter to meet
the specification.

Is the load

Reduce the load.

Replace the cooling
fan.

Is the cooling
fan rotating?

Replace the cooling
fan for mixing inside
air.

Is the cooling fan for mixing
inside air rotating?
(40HP/CT, 50HP/VT or more)

Remove obstacles.

Is the cooling air
passage blocked?

Faulty inverter or error
due to noise, etc.
Contract TWMC.

Is the ambient
temperature within
the specification ?

Arrange peripheral
conditions to meet the
specification.

(6) Overtemperature at inside air
and overheating at heatsink.

YES (30HP/CT, 40HP/VT or less)

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