sh030106u.pdf - 第413页

11. OPTI ONS AND P ERI PHER AL E QUIP MENT 11 - 92 11.15 Ear th-leak age cur rent br eaker (1) Selecti on method High-freque ncy chopper c urrents controlled by puls e width modulati on flow in the AC serv o circuits . L…

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11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 91
(f)
Varistor for input power supply (recommended)
Varistors are effective to prevent exogenous noise and lightning surge from entering the serv
o
amplifier. When using a varistor, connect it between each phase of the input power supply of the
equipment. For varistors, the TND20V-431K, TND20V-471K and TND20V-102K, manufactured by
NIPPON CHEMI-CON, are recommended. For detailed specification and usage of the varistors, refer
to the manufacturer catalog.
Power
supply
voltage
Varistor
Maximum rating
Maximum
limit
voltage
Static
capacity
(reference
value)
Varistor voltage rating
(range)
V1 mA
Permissible circuit
voltage
Surge
current
immunity
Energy
immunity
Rated pulse
power
[A] [V]
AC [Vrms] DC [V] 8/20 µs [A] 2 ms [J] [W] [pF] [V]
200 V
class/
100 V
class
TND20V-431K 275 350
10000/1
times
195
1.0 100
710 1300 430 (387 to 473)
TND20V-471K 300 385
7000/2
times
215 775 1200 470 (423 to 517)
400 V
class
TND20V-102K 625 825
7500/1
time
6500/2
times
400 1.0 100 1650 560 1000 (900 to 1100)
[Unit: mm]
WE
H
D
L
T
φd
Model
D
Max.
H
Max.
T
Max.
E
±1.0
L
Min.
(Note)
φd
±0.05
W
±1.0
TND20V-431K
21.5 24.5
6.4 3.3
20 0.8 10.0
TND20V-471K 6.6 3.5
TND20V-102K 22.5 25.5 9.5 6.4 20 0.8 10.0
Note. For special purpose items for lead len
g
th
(
L
)
, contact the manufacturer.
11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 92
11.15 Earth-leakage current breaker
(1) Selection method
High-frequency chopper currents controlled by pulse width modulation flow in the AC servo circuits.
Leakage currents containing harmonic contents are larger than those of the motor which is run with a
commercial power supply.
Select an earth-leakage current breaker according to the following formula, and ground the servo
amplifier, servo motor, etc. securely.
To minimize leakage currents, make the input and output wires as short as possible, and keep a
distance of 30 cm or longer between the wires and ground.
Rated sensitivity current ≥ 10 • {Ig1 + Ign + Iga + K • (Ig2 + Igm)} [mA] ···································· (11.1)
Ign
Noise filter
Wire
Ig1 Iga Ig2 Igm
M
Servo
amplifier
NV
Wire
Earth-leakage current breaker
K
Type
Mitsubishi
Electric
products
Models provided with
harmonic and surge
reduction techniques
NV-SP
NV-SW
NV-CP
NV-CW
NV-HW
1
General models
BV-C1
NFB
NV-L
3
Ig1: Leakage current on the electric channel from the earth-leakage current breaker to the input
terminals of the servo amplifier (Found from Fig. 11.15.)
Ig2: Leakage current on the electric channel from the output terminals of the servo amplifier to the servo
motor (Found from Fig. 11.15.)
Ign: Leakage current when a filter is connected to the input side (4.4 mA per one FR-BIF(-H))
Iga: Leakage current of the servo amplifier (Found from table 11.5.)
Igm: Leakage current of the servo motor (Found from table 11.4.)
Leakage current [mA]
Cable size [mm ]
2
120
100
80
60
40
20
0
2 5.5 14
3.5 8
38100
22
30
60150
80
120
100
80
60
40
20
0
2
3.5
5.5
8
14
22
38
80
150
30
60
100
Leakage current [mA]
Cable size [mm ]
2
200 V class/100 V class (Note) 400 V class
Note. "I
g
1" of 100 V class servo amplifiers will be 1/2 of 200 V class servo amplifiers.
Fig. 11.15 Example of leakage current per km (lg1, lg2) for CV cable run in metal conduit
11. OPTIONS AND PERIPHERAL EQUIPMENT
11 - 93
Table
11.4 Servo motor leakage current example (lgm)
Servo motor power [kW] Leakage current [mA]
0.05 to 1 0.1
1.2 to 2 0.2
3 to 3.5 0.3
4.2 to 5 0.5
6 to 7 0.7
8 to 11 1.0
12 to 15 1.3
20 to 25 2.3
Table
11.5 Servo amplifier leakage current example (Iga)
Servo amplifier capacity [kW] Leakage current [mA]
0.1 to 0.6 0.1
0.75 to 3.5 0.15
5/7 2
11/15 5.5
22 7
Table
11.6 Earth-leakage current breaker selection example
Servo amplifier
Rated sensitivity current of earth-leakage
current breaker [mA]
MR-J4-10B(-RJ) to MR-J4-350B(-RJ)
MR-J4-60B4(-RJ) to MR-J4-350B4(-RJ)
MR-J4-10B1(-RJ) to MR-J4-40B1(-RJ)
15
MR-J4-500B(-RJ)
MR-J4-500B4(-RJ)
30
MR-J4-700B(-RJ)
MR-J4-700B4(-RJ)
50
MR-J4-11KB(-RJ) to MR-J4-22KB(-RJ)
MR-J4-11KB4(-RJ) to MR-J4-22KB4(-RJ)
100