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MDS-D/DH Series Specifications Manual
6-6 Surge absorber
6 - 13
6-6 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
(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
Varistor type
Varistor
voltage
rating
(range)
Rating
Max. limit
voltage
Electro-
static
capacity
(reference
value)
Tolerable circuit
voltage
Surge current
withstand level
(A)
Energy
withstand level
(J)
Power
(V) AC(V) DC(V) 1 time 2 times
10/
1000μs
2ms (W) (V) (pF)
ERZV10D121
120
(108 to 132)
75 100 3500 2500 20 14.5 0.4 200 1400
TND10V-121K
ERZV10D221
220
(198 to 242)
140 180 3500 2500 39 27.5 0.4 360 410
TND10V-221K
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.
[Unit:mm]
Insulation tube
11.5
20.0
POINT