Mitsubishi Electric FR-F700PJ Series Manual page 72

Connection with machine
Direct connection
 When installing, align the motor shaft center and the machine shaft.
Insert a liner underneath the motor or the machine legs as required
to make a perfect alignment.
Level meter
1
A
Good

Use a feeler gauge to check the gaps in a few places, and make sure that all
the gap sizes are the same (3/100mm or less difference except the gap A).

Unevenness shown in B is unacceptable (3/100mm or smaller difference)
NOTE

When a fan or blower is directly connected to the
motor shaft or to the machine, the machine side may
become unbalanced. When the unbalanced degree
becomes larger, the motor vibration becomes larger
and may result in a damage of the bearing or other
area. The balance quality with the machine should
meet the class G2.5 or lower of JISB0905 (the
Balance Quality Requirements of Rigid Rotors).
Connected by belt
 When installing, place the motor shaft and the machine shaft in
parallel, and mount them to a position where their pulley centers are
aligned. Their pulley centers should also have a right angle to each
shaft.
 An excessively stretched belt may damage the bearing and break
the shafts. A loose belt may slip off and easily deteriorate. A flat belt
should be rotated lightly when it is pulled by one hand. For details,
refer to the Instruction Manual of the motor.
Connected by gear couplings
 Place the motor and machine shafts in parallel, and engage the gear
teeth properly.
Permissible vibration of the motor
 Bearing is subjected to fretting while
the motor is stopped. Suppress the
vibration to about the half of the
permissible value.
Amplitude at each vibration
condition is as shown right.
Permissible load of the shaft
MM-EFS1M(4)
L [mm] 
Permissible radial load
[N] 
Permissible thrust load
[N] 

For the symbols used in the table, refer
to the diagram at right.

The permissible radial load and the
permissible thrust load are the
permissible values when they are
applied individually.
72
2
Level meter
Bad Bad
200
100
80
60
50
40
30
[ m]
20
500 1000 1500 20002250
Rotation speed [r/min]
7 15 22 37 55 75 11K
40 50 60 80
535 585 830 1070 1710
470 500 695 900 1420
L
Radial load
Thrust load
Precautions for selection
Inverter capacity selection
 When operating a special motor or more than one motor in parallel
with a single inverter, select the inverter capacity so that 1.05 times
the total rated motor current is less than the rated output current of
the inverter.
 Multiple IPM motors cannot be connected to an inverter.
Starting torque of the motor
 The start and acceleration characteristics of the motor driven by the
inverter are restricted by the overload current rating of that inverter.
Generally the torque characteristic is less than when the motor is
started by a commercial power supply. When torque boost
adjustment or simple magnetic flux vector cannot provide enough
starting torque, select the inverter of one rank higher capacity or
increase the capacities of both the motor and inverter.
Acceleration and deceleration times
 The acceleration/deceleration time of the motor depends on the
motor-generated torque, load torque and moment of inertia of the
2
load (GD ).
 When the stall prevention function is activated during acceleration/
deceleration, increase the acceleration/deceleration time as the
actual time may become longer.
 When shorter acceleration/deceleration time is required, increase
the torque boost value (setting too large value may cause activation
of the stall prevention function, resulting in longer acceleration time),
apply General-purpose magnetic flux control, or increase the motor
capacity. To shorten the deceleration time, additional use of options
such as a brake resistor (MRS type, MYS type or FR-ABR), brake
unit (FR-BU2) to absorb the braking energy, or power regeneration
common converter (FR-CV) is required.
Power transfer mechanism
(gear, belt, chain, etc.)
 When an oil-lubricated gear box, speed change gear or similar
device is used in the power transfer system, note that continuous
operation at low decelerated speed only may deteriorate oil
lubrication, causing seizure. When performing fast operation at
higher than 60Hz, fully note that such operation will cause strength
shortage due to the noise, life or centrifugal force of the power
transfer mechanism.
Instructions for overload operation
 When performing operation of frequent start/stop of the inverter, rise/
fall in the temperature of the transistor element of the inverter will
repeat due to a continuous flow of large current, shortening the life
from thermal fatigue. Since thermal fatigue is related to the amount of
current, the life can be increased by reducing bound current, starting
15K
current, etc. Since thermal fatigue is related to the amount of current,
110
the life can be increased by reducing current. However, decreasing
current will result in insufficient toque and the inverter may not start. A
2150
counter action for this to raise the permissible current level by
1810 increasing the inverter capacity when using a general-purpose motor,
and by increasing the inverter and IPM capacities when using an IPM
motor.