Surge Absorber - Mitsubishi Electric MELDAS MDS-R Series Technical Specification And Instruction Manual

5-6 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
voltage
rating
Varistor type
(range)
(V)
120
ERZV10D121
（108 to 132）
TNR10V121K
ERZV10D221 220
（198 to 242）
TNR10V221K
(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 Matsushita Electric Industrial Co., Ltd.
TNR10V121K and TNR10V221K are manufactured by MARCON Electronics Co., Ltd.
Contact: Matsushita Electronic Components Co., Ltd : http://www.panasonic.co.jp/ maco/
MARCON Electronics Co., Ltd. :Telephone (Kanto)03-3471-7041 (+81-3-3471-7041)
(3) Outline dimension drawing
• ERZV10D121, ERZV10D221
20.0
Normally use a product with 120V varistor voltage. If there is no allowance for the
POINT
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.
5. Peripheral Devices
Varistor specifications
Surge current
Tolerable circuit
withstand level
voltage
AC (V) DC (V) 1 time
75 100 3500
140 180 3500
11.5
Insulation tube
Rating
Energy
withstand level
(A) (J)
2 times 10/1000μs 2ms
2500 20 14.5
2500 39 27.5
(Kinki) 06-6364-2381 (+81-3-6364-2381)
(Chubu) 052-581-2595 (+81-52-581-2595)
Unit: [mm]
5 - 9
Electrostatic
Max. limit
capacity
voltage (reference
Power
value)
(W) (V) (pF)
0.4 200 1400
0.4 360 410