
6.BUILT-IN BRAKE SPECIFICATIONS FOR THE αiS/αi SERIES B-65262EN/03
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6.2.2 Connection of the Brakes
Configure a brake circuit by referencing the following brake
connection diagrams and the recommended parts shown in the
following section.
To other 24 VDC peripheral devices
(such as a relay and solenoid)
(CNCs and amplifiers not included)
1 Use a 24 VDC power supply as the power supply for the αi
series servo motor brake. Power (equivalent to 24 Vrms)
produced by full-wave rectification after transforming
commercial power (50 Hz/60 Hz) is also available.
2 Use a power supply separate from the 24-V power supply for the
CNC and amplifier as the power supply for the brake. If the
control power supply is also used for the brake, an CNC or
amplifier malfunction or another danger may occur. The power
supply for a relay, solenoid, or another peripheral device can be
used for the brake. Be careful of the power capacity and changes
in voltage due to changes in load.
3 For full-wave rectification, transform the secondary side voltage
obtained during energization of the brake into approximately 29
VAC by taking voltage drop in the rectifier or cable into account.
In this case, check the power capacity and power voltage
fluctuations sufficiently and then make sure the fluctuations of
the voltage applied to the brake during energization falls within
24 Vrms ±10%. Switch the transformer's primary side input to a
desired position such as 100-110-120 VAC or 200-220-240
VAC.
4 If the contact is installed on the DC side (at the position shown
in the figure), the life of the contact is generally shortened due to
the surge voltage at brake off. Provide an adequate contact
capacity and always use a surge absorber and spark killer for
protecting the contact.
5 You can use either positive or negative power pin to connect the
brake because the brake coil is nonpolarized.
6 Use a shielded cable as required.