Yaskawa VS-626 MC5 User Manual

Page 247

9.1Protective and Diagnostic Functions

- 3

Corrective Actions

Probable Causes

Meaning

Fault Display

Input Pha Loss

Main Circuit Voltage Fault

The main circuit DC voltage oscil-
lates unusually (not when regenerat-
ing).

This fault is detected when L8-05 is
set to “Enabled.”

S An open-phase occurred in the in-

put power supply.

S A momentary power loss occurred.
S The wiring terminals for the input

power supply are loose.

S The voltage fluctuations in the input

power supply are too large.

S The

voltage

balance

between

phases is bad.

Reset the fault after correcting its
cause.

Output Pha Loss

Output Open-phase

An open-phase occurred at the In-
verter output.

This fault is detected when L8-07 is
set to “Enabled.”

S There is a broken wire in the output

cable.

S There is a broken wire in the motor-

winding.

S The output terminals are loose.

Reset the fault after correcting its
cause.

Output

a oss

The motor being used has a capacity
less than 5% of the Inverter’s maxi-
mum motor capacity.

Check the motor and Inverter capac-
ity.

Cooling Fin Overheating

The ambient temperature is too high.

Install a cooling unit.

OH OH1

The temperature of the Inverter’s
cooling fins exceeded the setting in

There is a heat source nearby.

Remove the heat source.

Heatsink Over tmp

cooling fins exceeded the setting in
L8-02 or 105

qC.

The Inverter’s cooling fan has
stopped.

Replace the cooling fan. (Contact

Inverter internal cooling fan stopped
(18.5kW or more)

Inverter internal cooling fan has
stopped (18.5kW or more).

Replace the cooling fan. (Contact
your Yaskawa representative.)

Dyn Brk Resistor

Installed Braking Resistor Over-
heating

The braking resistor is overheated
and the protection function set with
L8-01 has operated.

The deceleration time is too short and
the regenerative energy from the mo-
tor is too large.

S Reduce the load, increase the decel-

eration time, or reduce the motor
speed.

S Change to a Braking Resistor Unit.

Dyn Brk Transistr

Internal Braking Transistor Fault

The braking transistor is not operat-
ing properly.

-- --

S Try turning the power supply off

and on.

S Replace the Inverter if the fault con-

tinues to occur.

OL1

Motor Overload

The motor overload protection func-
tion has operated based on the inter-

l l

The load is too heavy. The accelera-
tion time, deceleration time, and cycle
time are too short.

Check the size of the load and the
length of the acceleration, decelera-
tion, and cycle times.

OL1

Motor Overloaded

tion has operated based on the inter
nal electronic thermal value.

The V/f characteristics voltage is too
high.

Check the V/f characteristics.

The motor’s rated current setting
(E2-01) is incorrect.

Check the motor’s rated current set-
ting (E2-01).

OL2

Inverter Overload

The Inverter overload protection
function has operated based on the
i

l l

The load is too heavy. The accelera-
tion time, deceleration time and cycle
time are too short.

Check the size of the load and the
length of the acceleration, decelera-
tion, and cycle times.

OL2

Inv Overloaded

function has operated based on the
internal electronic thermal value.

The V/f characteristics voltage is too
high.

Check the V/f characteristics.

The Inverter capacity is too low.

Replace the Inverter with one that has
a larger capacity.

OL3

Overtorque Det 1

Overtorque 1

There has been a current greater than
the setting in L6-02 for longer than
the setting in L6-03.

-- --

S Make sure that the settings in L6-02

and L6-03 are appropriate.

S Check the mechanical system and

correct the cause of the overtorque.

OL4

Overtorque det 2

Overtorque 2

There has been a current greater than
the setting in L6-05 for longer than
the setting in L6-06.

-- --

S Make sure that the current setting in

L6-05 and time setting in L6-06 are
appropriate.

S Check the mechanical system and

correct the cause of the overtorque.

Overspeed

The speed has been greater than the

i F1 08 f

Overshooting/Undershooting are oc-
curring.

Adjust the gain again.

Over speed

e speed as bee g eate t a t e

setting in F1-08 for longer than the
setting in F1-09.

The reference speed is too high.

Check the reference circuit and refer-
ence gain.

O e speed

The settings in F1-08 and F1-09
aren’t appropriate.

Check the settings in F1-08 and
F1-09.

PG Disconnection Detected

There is a break in the PG wiring.

Fix the broken/disconnected wiring.

PGO

The PG is disconnected.
The Inverter is outputting a frequen-

The PG is wired incorrectly.

Fix the wiring.

PGO

PG open

The Inverter is outputting a frequen-
cy, but PG pulses aren’t being input.

Power isn’t being supplied to the PG.

Supply power to the PG properly.

PG open

-- --

Check for open circuit when using
brake (motor).