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01/02 AWB8230-1415GB
Controlling an external brake
169
Controlling an external brake
You can use the DV6 frequency inverter to control an external
brake, which is needed where heavy loads are to be lifted, for
example in lift and crane applications. When an external brake is
employed, you should use the SLV (sensorless vector) or 0 Hz SLV
control mode, which can provide a higher torque (
a
Section
“Voltage/frequency characteristic and voltage boost“, Page 126).
X
To control an external brake, enter 01 in PNU b120 (brake
control active).
The brake control on startup consists of the following steps
(
a
Fig. 171). The brake is activated after the frequency inverter
applies a frequency to the motor:
• When the frequency inverter receives a start signal, it accele-
rates the motor at the defined starting ramp to the frequency at
which the brake is enabled (PNU b125).
• The Release Brake confirmation waiting time set under
PNU b121 begins.
• When the waiting time set under PNU b121 has expired, one of
two things happens:
– The Brake Enable current (PNU b126) was reached:
The digital output configured as BRK is activated (release
brake).
– The Brake Enable current (PNU b126) was
not
reached:
The digital output configured as BER is activated (brake
fault).
• As soon as the BRK signal (release brake) is issued to the
external brake, the Braking Confirmation waiting time set under
PNU b124 begins. During this time, the frequency inverter waits
for confirmation that the brake has been released. The confir-
mation must activate one of digital inputs 1 to 8 which has been
configured as BOK.
• If the BOK input is activated within the Brake Confirmation wait
time set under PNU b124, the waiting time for acceleration
defined under PNU b122 begins.
• After the waiting time set under PNU b122, the frequency
inverter accelerates the motor to the setpoint frequency.
• If, during the Brake Confirmation waiting time in PNU b124, the
BOK input is not activated (i.e. the brake has not released), the
following happens:
– The BRK output (release brake) is deactivated.
– The BER output (brake fault) is activated.
– The DV6 frequency inverter issues fault message E32.
When a stop signal is issued, the DV6 frequency inverter does the
following (
a
Fig. 171). The brake is activated before the motor
has come to a standstill:
Figure 170: Brake control
G1:Frequency inverter
K1: Brake ON
K2: Emergency brake or alarm system
Y1: Brake
BRK
BOK
BER
11
K2
G1
24 V
K1
Y1
M1
M
3
h
–
–
+
+
–
–
+
+
14
CM2
1
L
Warning!
When the frequency inverter issues a fault message, it
also switches 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.
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