Mitsubishi Electric FR-A700 Technical Manual page 105

Name
If the heatsink overheats, the temperature
Fin overheat sensor is actuated to stop the inverter
output.
If a power failure occurs for longer than
15ms (this also applies to inverter input
shut-off), the instantaneous power failure
protective function is activated to trip the
inverter in order to prevent the control circuit
from malfunctioning. If a power failure
persists for longer than 100ms, the fault
Instantaneous output is not provided, and the inverter
power failure restarts if the start signal is ON upon power
restoration. (The inverter continues
operating if an instantaneous power failure
is within 15ms.) In some operating status
(load magnitude, acceleration/deceleration
time setting, etc.), overcurrent or other
protection may be activated upon power
restoration.
If the power supply voltage of the inverter
decreases, the control circuit will not
perform normal functions. In addition, the
motor torque will be insufficient and/or heat
generation will increase. To prevent this, if
the power supply voltage decreases below
Undervoltage
approx. 150VAC (approx. 300V for the 400V
class or less), this function stops the inverter
output.
When a jumper is not connected across P/+
and P1, the undervoltage protective function
is activated.
This fault is output when function valid
setting ( = 1) is set in [Pr. 872 Input phase loss
protection selection] and one phase of the
three phase power input is lost.
Input
This fault is also output when phase-to-
phase voltage of the three-phase power
input becomes unbalanced by large in
E700 D700
Because [ Pr.251 Output phase failure
protection selection ] is set valid (=1), this
Output function stops the inverter output if one of
the three phases (U, V, W) on the inverter's
output side (load side) is lost.
If the output frequency has fallen to 0.5Hz
by stall prevention operation and remains
for 3s, the inverter trips. (OL appears while
stall prevention is being activated.)
For
A700
by Real sensorless vector control or vector
Stall prevention
control, the inverter output is stopped if
frequency drops to the [Pr. 865 Low speed
detection] (initial value is 1.5Hz) setting by
torque limit operation and the output torque
exceeds [Pr. 874 OLT level setting] (initial
value is 150%) and remains for more than
3s.
Description
.
, when speed control is performed
Indication
Operation Parameter unit
panel FR-PU04 FR-PU07
H/Sink O/Temp
(E.FIN)
Inst. Pwr. Loss
(E.IPF)
Under Voltage
(E.UVT)
Input
Fault 14 phase
(E.ILF)
loss
E.LF
(E.LF)
Stll Prev STP
(E.OLT)
98
SPECIFICATIONS
Available Inverters
A700 F700 E700 D700
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