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Programming the control
signal terminals
01/02 AWB8230-1415GB
108
Release brake (BRK) and brake fault (BER)
The digital outputs configured as BRK and BER are used for cont-
rolling an external brake or an emergency brake. A brake is needed
in application involving the lifting of heavy loads, such as lift and
crane controllers. If an external brake is used, you should use the
SLV (sensorless vector) or 0 Hz SLV control mode, which can
provide a higher torque (
a
Section “Voltage/frequency charac-
teristic and voltage boost“, Page 126).
To release the brake, the DV6 frequency inverter issues the BRK
signal.
The DV6 issues the BER signal when:
• the time set under PNU b124 has expired and the digital input
configured as BOK is not activated (acceleration),
• the time set under PNU b124 has expired and the digital input
configured as BOK is not deactivated (deceleration),
• the time set under PNU b121 has expired and the Brake Enable
current defined under PNU b126 was not reached.
Together with the BER output, the frequency inverter issues fault
message E36.
.
X
Program one of the digital outputs 11 to 15 as BRK by entering
the value 19 in the corresponding PNU (C021 to C025) or under
PNU C026 for signalling relay contacts K11-K12.
X
Program one of the digital outputs 11 to 15 as BER by entering
the value 20 in the corresponding PNU (C021 to C025) or under
PNU C026 for signalling relay contacts K11-K12.
For a detailed description of the extended parameter groups,
a
Section “Controlling an external brake“, Page 169.
Warning!
When the frequency inverter issues a fault message, it
also deactivates the output to the motor controller. In this
case, the motor is not stopped by the frequency inverter.
For applications in which safety is an issue, you must
therefore provide an emergency brake.
Figure 110: Digital output 11 configured as BRK (release brake) and
14 as BER (brake fault).
BRK
BER
24 V
100 mA
11
K1
K2
–
+
CM2
12
13
14
15
Figure 111: Brake control function chart
BER
BOK
BRK
PNU b125
FWD
PNU b122
PNU b121
PNU b124
PNU b124
PNU b123
t
f
o
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