Chapter 6 Wiring
6–10
6-3-4 Surge absorber
As protection against surge voltage caused by lightning, etc., the surge absorber and radio noise filter
shown below are built into the intelligent servomotor's I/F unit MDS-B-HSIF (refer to Chapter 6) and
the MDS-B-CV AC reactor B-ALxx. When not using these simultaneously, install a surge absorber
and filter on the input power supply as shown below. Refer to the following table and select the surge
absorber.
Symbol Type Maker Rating
VAR1 to
VAR3
TNR23G471K
MARCON ELECTRONICS
CO., LTD.
Varistor voltage 423 to 517V
VAR4 DSAZR2-302M Mitsubishi Materials Corp.
DC discharge start voltage
2400 to 3600V
C1 to C3 AL-U2E224K
SHIZUKI ELECTRONIC
CO., INC.
250VAC 0.22µF
C4 to C6 DE7120F332MVA-1KC
Murata Manufacturing Co.,
Ltd.
2500VAC 3300pF
6-4 Wiring the motor with brakes
CAUTION
1. No mechanical guarantee is provided even when the dynamic brakes are
used. If the machine could drop during a power failure, use a motor with
magnetic brakes or provide an external brake mechanism to prevent
dropping.
2. The magnetic brakes are used for holding, and must not be used for normal
braking. There may be cases when holding is not possible due to the life
and machine structure (when ball screw and servomotor axis are connected
via a timing belt, etc.). Provide a stopping device to ensure safety on the
machine side.
3. The magnetic brakes of the motor with magnetic brakes are controlled in
the intelligent servomotor. However, provide a double circuit configuration
so that these brakes will operate even with the external emergency stop
signal.
6-4-1 Connection example
Servomotor
Magnetic brakes
BR
RG
RA
EMG
24VDC
Amplifier
Cut off with emergency stop signal.
1) The brakes are safety brakes, and will operate when the power (24VDC) is turned OFF.
L1
L2
L3
PE
VAR1
VAR2 VAR3
VAR4
C1
C2 C3
C4
C5
C6
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