Mitsubishi Electric Freqrol-A100 Instruction Manual page 165

5.1 ERRORS
' l f any fault has occurred in the inverter, the corresponding protective functio2
is activated to bring the inverter to an alarm stop and automatically give the
corresponding error (alarm) indication on the PU display and inverter LED.
When the protective function is activated, reset the inverter in accordance with
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page.
5.1.1 Errors (Alarms)
-
4larm
Code
ay
Inverter LED
-
- -
Description
Dis
Parameter Unit
Alarm
o u t p u t
[Across
8-C)
provided
[Open)
Name
During
~ c e l e r a t i o n
If the inverter output current reaches or exceeds
150% of the rated current, the protective circuit is
activated to stop the inverter. When any main cir-
cuit device is overheated, the protective circuit is
also activated to stop the output of the inverter.
I C During Acc
tedy Spd Oc
Ic During Dec
During constant
speed
During
jeceleration
During stop
During
acceleration
Iv During Acc
If the converter output voltage is excessive due to
the regenerative energy from the motor, the protec-
tive circuit is activated to stop the transistor out-
put.
This may also be activated by a surge voltage gen-
erated in the power supply system.
'rovided
[Open)
During constant
speed
tedy Spd Ov
Iv During Dec
During
deceleration
During stop
The electronic overcurrent protection in the in-
verter detects inverter overload or motor overheat
and activates the protective circuit to stop the in-
verter output. When a multi-pde motor or more
than one motor is driven, for example, the motor(s)
cannot be protected by the electronic overcurrent
protection. Provide a thermal relay in the inverter
output circuit. In this case, setting the electronic
overcurrent protection value to O A activates the in-
verter protection only. (Activated at a current
120% or more of the rated current.)
otor
Overload
Provided
(Open)
(Motor protection) Overload shut-off
(electronic overcurrent
protection)
~ v . Overload
(Inverter protection)
If an instantaneous power failure has occurred in
excess of 15msec (this applies also to inverter in-
put power shut-off), this function is activated to
stop the inverter output. (If the power failure is
within lSmsec, the control circuit operates without
fault. If the power failure persists for more than
about IOOmsec, the protective circuit is reset.)
If the inverter power supply voltage has reduced,
the control circuit cannot operate properly, result-
ing in the decrease in motor torque and/or the in-
crease in heat generation. To prevent this, if the
power supply voltage reduces below about 300V,
this function stops the inverter output.
When there is no jumper or DC reactor connected
across terminals P and P l , the U n d e ~ o l t a g e
protection is also activated.
If a ground fault current has flown due to a ground
fault occurring in the output (load) side of the in-
verter, this function stops the inverter output. A
ground fault occurring at low ground resistance
may activate the overcurrent protection (OCI to
Instantaneous power
lailure protection
Provided
(Open)
1st. Pwr. Loss
Provided
(Open)
lnder Voltage
Output side ground fault
overcurrent protection
Provided
(Open)
iround Fault
If
the external thermal relay for motor overheat pro-
tection or the internally mounted temperature relay
in the motor has been switched on (relay contacts
open), this function stops the inverter output and
keeps it stopped. This protection is only provided
when " I " , '3', "5" or
"7"
has been set in Pr. 17 "ex-
ternal thermal relay input function".
External thermal relay
operation
Provided
(Open)
)H Fault