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5. Peripheral Devices
5 - 9
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 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
10/1000μs
2ms (W) (V) (pF)
ERZV10D121
TNR10V121K
120
（108 to 132）
75 100 3500 2500 20 14.5 0.4 200 1400
ERZV10D221
TNR10V221K
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 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)
(Kinki) 06-6364-2381 (+81-3-6364-2381)
(Chubu) 052-581-2595 (+81-52-581-2595)
(3) Outline dimension drawing
ERZV10D121, ERZV10D221
Unit: [mm]
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.
11.5
Insulation tube
20.0