Selection Of Regenerative Resistor; Limits For Hs-Mf23; Approximate Calculation Of Positioning Frequency; Calculation Of Regenerative Energy - Mitsubishi MELDAS HS Series Specifications And Instruction Manual

11-4 Selection of regenerative resistor

The intelligent servomotor series does not have the optional regenerative resistor. (Only the standard
built-in resistor is provided.) Thus, when selecting the motor, make sure that the regenerative energy
does not exceed the capacity of the built-in regenerative resistor.

11-4-1 Limits for HS-MF23

The HS-MF23 does not have a built-in
regenerative resistor. Thus, there are limits
to the instantaneous regeneration capacity.
Avoid use in which the regeneration occurs
continuously, such as with a vertical axis.
When using the motor in the left range of
the graph on the right, there are no limits to
the regeneration frequency. When used in
the right range, an overvoltage alarm could
occur, so avoid using in this range.

11-4-2 Approximate calculation of positioning frequency

The tolerable positioning frequency for the HS-FR/HS-SF type can be approximately calculated with
expression (11-5).
To obtain the detailed value, refer to section "11-4-3 Calculating the regenerative energy" and section
"11-4-4 Calculating the positioning frequency", and calculate.
Tolerable frequency =
Type
Tolerable frequency for
independent motor

11-4-3 Calculation of regenerative energy

(1) For horizontal axis
For the horizontal axis, the regenerative energy E
calculated with the expression (11-6). If the E
absorbed by the capacitor on the amplifier, and the energy consumption is zero (E
= 5.48 × 10
E
R
η : Motor reverse effect
J : Motor inertia
L
J : Load inertia
M
N : Motor speed
Ec : Amplifier charging energy
Chapter 11 Selection
Tolerable frequency for independent motor
(m + 1)
m =
RF43 RF73
360 195
· η · (J
–7 2
+ J ) · N
L M
300
200
[%]
100
10
Load moment of inertia rate GDL
×
Continuous rotation speed
J
/J
L M .........................................................................
SF52 SF53
220 100
consumed by the regenerative resistor can be
R
value is negative, all of the regenerative energy is
R
– Ec (J) ................................................. (11-6)
–4
(× 10
–4
(× 10
(r/min)
(J)
11–10
Input power voltage
−− 200VAC
−− 230VAC
20 30
2 2
/GDm
Rated rotation speed
SF102 SF103
110 50
= 0).
R
2
kg· cm )
2
kg· cm )
40
2
(11-5)
SF202
50