Surge Absorber - Mitsubishi Electric MDS-D-SPJ3 Specification Manual

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
voltage
rating
Varistor type
(range)
(V)
ERZV10D121 120
TND10V-121K (108 to 132)
ERZV10D221
220
TND10V-221K (198 to 242)
(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
11.5
20.0
Normally use a product with 120V varistor voltage. If there is no allowance for the brake operation
POINT
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.
Varistor specifications
Rating
Surge current
Tolerable circuit
withstand level
voltage
(A)
AC(V) DC(V) 1 time 2 times
75 100 3500 2500
140 180 3500 2500
Insulation tube
[Unit:mm]
MDS-D-SVJ3/SPJ3 Series Specifications Manual
Energy Max. limit
withstand level Power
(J)
10/
2ms (W)
1000μs
20 14.5 0.4
39 27.5 0.4
6-6 Surge absorber
Electro-
static
capacity
voltage
(reference
value)
(V) (pF)
200 1400
360 410
6 - 9