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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 189

Transistorized inverter, high function & low acoustic noise.
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Operation
Parameter
Panel
Unit
Display
(FR-PU04)
(FR-DU04)
Ground
Output side ground fault
E. GF
Fault
overcurrent protection
External thermal relay
E.OHT
OH Fault
operation (Note 3)
E.OLT
During acceleration
(When
stall
prevention
operation
Stll Prev
has
STP
During constant-speed
reduced
(OL shown
operation
the
during stall
running
prevention
frequency
operation)
to 0. OL
during stall
During deceleration
prevention
operation)
Option
E.OPT
Option alarm
Fault
Option slot
E.OP1 to
alarm
Option slot alarm
OP3
1 to 3
Corrupt
E. PE
Parameter error
Memry
PU Leave
PU disconnection
E.PUE
Out
occurrence
Retry No
E.RET
Retry count exceeded
Over
Open output phase

E.LF
protection
E.CPU
CPU Fault
CPU error
E.E6
CPU error
CPU error
E.E7
CPU error
CPU error
24VDC power output short

E.P24
circuit
Operation panel power short

E.CTE
circuit
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Name
This function stops the inverter output if a ground fault current flows due
to a ground fault occurring in the inverter's output (load) side when
starting the inverter. A ground fault occurring at low ground resistance
may activate the overcurrent protection (OC1 to OC3).
If the external thermal relay designed for motor overheat protection or the
internally mounted temperature relay in the motor switches on (relay
contacts "open"), the inverter output can be stopped if those contacts
had been entered into the inverter. If the relay contacts are reset
automatically, the inverter will not restart unless it is reset.
If a current more than 150% (Note 4) of the rated inverter current flows in
the motor, this function lowers the frequency until the load current
reduces to prevent the inverter from resulting in overcurrent shut-off.
When the load current has reduced below 150%, this function increases
the frequency again to accelerate and operate the inverter up to the set
frequency.
If a current more than 150% (Note 4) of the rated inverter current flows in
the motor, this function lowers the frequency until the load current reduces
to prevent overcurrent shut-off. When the load current has reduced below
150%, this function increases the frequency up to the set value.
If the regenerative energy of the motor has increased above the brake
capability, this function increases the frequency to prevent overvoltage
shut-off. If a current more than 150% (Note 4) of the rated inverter
current flows in the motor, this function increases the frequency until the
load current reduces to prevent the inverter from resulting in overcurrent
shut-off. When the load current has reduced below 150%, this function
decreases the frequency again.
•Stops the inverter output if the dedicated inboard option used in the
inverter results in setting error or connection (connector) fault.
•When the high power factor converter connection is selected, this alarm
is displayed if AC power is connected to R, S, T 〈L
Stops the inverter output if a functional fault (such as communication
error of the communication option) occurs in the inboard option loaded in
any slot.
Stops the output if a fault occurs in the E
settings.
This function stops the inverter output if communication between inverter
and PU is suspended, e.g. the operation panel or parameter unit is
disconnected, when "2", "3", "16" or "17" is set in Pr. 75 "reset
selection/PU disconnection detection/PU stop selection". This function
stops the inverter output if the number of successive communication
errors is greater than the number of permissible retries when Pr. 121
value is "9999" for RS-485 communication from PU connector.
This function stops the inverter output if communication is broken for a
period of time set in Pr. 122.
If operation cannot be resumed within the number of retries set, this
function stops the inverter output.
This function stops the inverter output when any of the three phases (U,
V, W) on the inverter's output side (load side) opens.
If the arithmetic operation of the built-in CPU does not end within a
predetermined period, the inverter self-determines it has an alarm and
stops the output.
If the arithmetic operation of the peripheral circuit of the built-in CPU
does not end within a predetermined period, the inverter self-determines
it as an alarm and stops the output.
The inverter output is stopped if a data error occurs in the peripheral
circuit of the built-in CPU.
When 24VDC power output from the PC terminal is shorted, this function
shuts off the power output. At this time, all external contact inputs switch
off. The inverter cannot be reset by entering the RES signal. To reset,
use the operation panel or switch power off, then on again.
When the operation panel power (P5S of the PU connector) is shorted,
this function shuts off the power output. At this time, the operation panel
(parameter unit) cannot be used and RS-485 communication from the
PU connector cannot be made. To reset, enter the RES signal or switch
power off, then on again.
175
PROTECTIVE FUNCTIONS
Description
〉.
, L
, L
1
2
3
2
PROM which stores parameter

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