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3-22 Basic Installation MN1942
3.5.6 Motor brake connection
You might wish to wire a motor’s brake, via relays, to digital outputs on connector X3 (see section
3.3.1). This provides a way for the MicroFlex e100 to control the motor’s brake. A typical circuit
is shown in Figure 10.
C
D
from motor brake
connec tions
Separate
customer
supplied
24 VDC supply
Relay 2
Relay 1
+24V 0V
The inner shi eld
surrounding the
brake wires should
be earthed/grounded
at one poi nt onl y.
The relays have normally open
contac ts and are shown deactivated
(contacts open, brake engaged).
DOUT0+
DOUT0-
11
1
DOUT1+
DOUT1-
13
3
User supply V+
User supply GND
‘X3’
Figure 10 - Motor brake control circuit
This circuit uses the drive enable signal (configured using DRIVEENABLEOUTPUT to appear on
DOUT0) in conjunction with DOUT1 (configured as the MOTORBRAKEOUTPUT). See the Mint help
file for details. With this configuration, the following sequences can be used to control the brake.
To engage the brake:
H The motor is brought to rest under normal control;
H Relay 2 is deactivated, causing the brake to engage;
H The drive is disabled. This removes power from the motor and causes Relay 1 to be
deactivated.
To disengage the brake:
H The drive is enabled, activating Relay 1;
H Power is applied to the motor to hold position under normal control;
H Relay 2 is activated, causing the brake to be disengaged.
It may be necessary to include a small delay, after Relay 2 has been activated, before starting
motion. This delay will allow time for the relay contacts to engage and the brake to release.
The 24 VDC power supply used to power the brake must be a separate supply as
shown in Figure 10. Do not use the supply that is powering the MicroFlex e100
digital outputs. The brake wires often carry noise that could cause erratic drive
operation or damage. The brake contacts must never be wired directly to the
digital outputs. The relay(s) should be fitted with a protective flyback diode, as
shown. The separate 24 VDC supply used for the motor brake may also be used
to power the relay in the thermal switch circuit (section 3.5.5).
CAUTION
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