Mitsubishi Electric MELDAS MDS-B-SVJ2 Series, Specifications And Instruction Manual

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Chapter 7 Peripheral Devices
7-7
7-4-3 Surge absorber
When controlling a magnetic brake of a servomotor in DC OFF circuit, a surge absorber must be
installed to protect the relay contacts and brakes. Commonly a varistor is used.
(1) Selection of varistor
When a varistor is installed in parallel with the coil, the surge voltage can be adsorbed as heat to
protect a circuit. Commonly a 120V product is applied. When the brake operation time is delayed,
use a 220V product. Always confirm the operation with an actual machine.
(2) Specifications
Select a varistor with the following or equivalent specifications. To prevent short-circuiting, attach
a flame resistant insulation tube, etc., onto the leads as shown in the following outline dimension
drawing.
Varistor specifications
Rating Varistor
voltage
rating
(range)
Tolerable circuit
voltage
Surge current
withstand level
(A)
Energy
withstand level
(J)
Power
Max.
limit
voltage
Electrostatic
capacity
(reference
value)
Varistor type
(V) AC
（
V
）
DC
（
V
）
1 time 2 times
10
/1000us
2ms
（
W
） （
V
） （
pF
）
ERZV10D121
TND10V-121K
120
(108 to 132)
75 100 3500 2500 20 14.5 0.4 200 1400
ERZV10D221
TND10V-221K
220
(198 to 242)
140 180 3500 2500 39 27.5 0.4 360 410
(Note 1) Selection condition: When ON/OFF frequency is 10 times/min or less, and exciting current is 2A or less
(Note 2) ERZV10D121 and ERZV10D221 are manufactured by Panasonic Electronic Devices Co.,Ltd.
TND10V-121K,TND10V-221K are manufactured by Nippon Chemi-Con Corporation
Contact: Panasonic Electronic Devices Co.,Ltd. : http://panasonic.co.jp/ped/
Nippon Chemi-Con Corporation : http://www.chemi-con.co.jp/
(3) Outline dimension drawing
•
ERZV10D121, ERZV10D221
POINT
Normally use a product with 120V varistor voltage. If there is no allowance for the
brake operation time, use the 220V product. A varistor whose voltage exceeds 220V
cannot be used, as such varistor will exceed the specifications of the relay in the
[Unit: mm]
Insulation tube
11.5
20.0