Precautions For Operation/Selection; Precautions For Use Of The Inverter; Operation; Power Supply - Mitsubishi Electric FR-A700 Manual

Precautions for Operation/Selection

Precautions for use of the inverter

Safety Precautions
To operate the inverter correctly and safely, be sure to read the
"instruction manual" before starting operation.
This product has not been designed or manufactured for use with
any equipment or system
conditions.
Please contact our sales office when you are considering using this
product in special applications such as passenger mobile, medical,
aerospace, nuclear, power or undersea relay equipment or system.
Although this product is manufactured under strict quality control,
safety devices should be installed when a serious accident or loss
is expected by a failure of this product.
The load used should be a three-phase induction motor only.

Operation

A magnetic contactor (MC) provided on the input side should not be
used to make frequent starts and stops. It could cause the inverter
to fail.
However, at this time, the motor cannot be brought to a sudden
stop. Hence, provide a mechanical stopping/holding mechanism for
the machine/equipment which requires an emergency stop.
It will take time for the capacitor to discharge after shutoff of the
inverter power supply. When accessing the inverter for inspection,
wait for at least 10 minutes after the power supply has been
switched off, and check to make sure that there are no residual
voltage using a tester or the like.
Wiring
Application of power to the output terminals (U, V, W) of the inverter
will damage the inverter. Therefore, fully check the wiring and
sequence to ensure that wiring is correct, etc. before powering on.
The terminals P/+, P1, N/- are provided for connection of a
dedicated option. Connect only a dedicated option. Do not short the
frequency setting power supply terminal 10 and common terminal 5
or the terminal PC and terminal SD.

Power supply

When the inverter is connected under a large-capacity power
transformer (1000kVA or more transformer) or when a power
capacitor is to be switched over, an excessive peak current may
flow in the power input circuit, damaging the inverter. To prevent
this, always install an optional AC reactor (FR-HEL).
(kVA)
5300
5000
Capacities requiring
installation of
4000
power coordination
3000 reactor
2000
1000
If a surge voltage occurs in the power supply system, this surge
energy may flow into the inverter, causing the inverter to display
overvoltage protection (E.OV ) and come to an alarm stop. To
prevent this, always install an optional AC reactor (FR-HAL).
89
operated under life-threatening
110165 247 330 420 550 kVA
Inverter capacity
Installation
Avoid hostile environment where oil mist, fluff, dust particles, etc.
are suspended in the air, and install the inverter in a clean place or
put it in an ingress-protected "enclosed" enclosure. When placing
the inverter in an enclosure, determine the cooling system and
enclosure dimensions so that the ambient temperature of the
inverter is within the permissble value. (refer to page 10 for the
specified value)
Do not install the inverter on wood or other combustible material as
it will be hot locally.
Install the inverter in the vertical orientation.
Setting
The inverter can be operated as fast as a maximum of 400Hz by
parameter setting. Therefore, incorrect setting can cause a danger.
Set the upper limit using the maximum frequency limit setting
function.
A setting higher than the initial value of DC injection brake
operation voltage or operation time can cause motor overheat
(electronic thermal relay trip).
Real sensorless vector control
Make sure to perform offline auto tuning before performing real
sensorless vector control.
The carrier frequencies are selectable from among 2k, 6k, 10k,
14kHz for real sensorless vector control.
Torque control can not be performed in the low speed region and at
a low speed with light load. Choose vector control.
Performing pre-excitation (LX signal and X13 signal) under torque
control may start the motor running at a low speed even when the
start command (STF or STR) is not input. The motor may run also
at a low speed when the speed limit value=0 with a start command
input. Perform pre-excitation after making sure that there will be no
problem in safety if the motor runs.
Do not switch between the STF (forward rotation command) and
STR (reverse rotation command) during operation under torque
control. Overcurrent shut-off error (E.OC ) or opposite rotation
deceleration error (E.11) occurs.
For the 0.4K to 3.7K, the speed deviation may become large at
20Hz or less and torque may become insufficient in the low speed
region under 1Hz during continuous operation under real
sensorless vector control. In such case, stop operation once and
reaccelerate to improve the problems.
When the inverter is likely to start during motor coasting under real
sensorless vector control, set to make frequency search of
automatic restart after instantaneous power failure valid (Pr. 57 ≠
"9999", Pr. 162 = "10").
The 22K does not comply with the 2nd environment of the EMC
Directive.