114
Functional Description
CG Drives & Automation, 01-5326-01r3b
11.3.4 Mechanical brake control
The four brake-related menus [33C] to [33F] can be used to
control mechanical brakes e.g. to handle basic hoisting
functions. When hoisting a load generally a mechanical
brake holds the load when the AC drive is not running. To
prevent the load from falling down a holding torque must be
initiated before the mechanical brake is released. On the
other hand when stopping hoisting the brake must be
activated before the holding torque is removed.
Support is included for a Brake Acknowledge signal via a
digital input. It is monitored using a brake fault time
parameter. Additional output and trip/warning signals are
also included. The acknowledge signal is either connected
from the brake contactor or from a proximity switch on the
brake.
The brake acknowledge signal can also be used to improve
safety by preventing hoist falling load in case the brake is not
engaged when stopping.
Brake not released - Brake Fault trip
During start and running the brake acknowledge signal is
compared to the actual brake output signal and if no
acknowledge, i.e. brake not released, while brake output is
high for the Brake Fault time [33H], then a Brake trip is
generated.
Brake not engaged - Brake Warning and
continued operation (keep torque)
The brake acknowledge signal is compared to the actual
brake output signal at stop. If acknowledge is still active, i.e.
brake not engaged, while brake output is low for the Brake
Engage time [33E] then a Brake warning is generated and
the torque is kept, i.e. prolonging normal brake engage
mode, until brake closes or an emergency action is needed
by the operator, such as setting down the load.
Brake Release Time [33C]
The Brake Release Time sets the time the AC drive delays
before ramping up to whatever final reference value is
selected. During this time a predefined speed can be
generated to hold the load where after the mechanical brake
finally releases. This speed can be selected at Release Speed,
[33D]. Immediate after the brake release time expiration the
brake lift signal is set. The user can set a digital output or
relay to the function Brake. This output or relay can control
the mechanical brake.
Communication information
Fig. 87 shows the relation between the four Brake functions.
•
Brake Release Time [33C]
•
Start Speed [33D]
•
Brake Engage Time [33E]
•
Brake Wait Time [33F]
The correct time setting depends on the maximum load and
the properties of the mechanical brake. During the brake
release time it is possible to apply extra holding torque by
setting a start speed reference with the function start speed
[33D].
Default:
0.00 s
Range:
0.00–3.00 s
Modbus Instance no/DeviceNet no:
43112
Profibus slot/index
169/16
EtherCAT index (hex)
4c28
Profinet IO index
19496
Fieldbus format
Long, 1=0.01 s
Modbus format
EInt
33C Brk Release
Stp
0.00s
9(0R'ULYH 96, 9(0 U
Summary of Contents for VEMoDRIVE VSI 2.0 HD
Page 1: ...Frequency converter VEMoDRIVE VSI 2 0 HD Instruction manual 01 5326 01 04 2018...
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Page 40: ...38 Installation CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
Page 52: ...50 Getting Started CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
Page 64: ...62 EMC and standards CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
Page 142: ...140 Functional Description CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
Page 198: ...196 CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
Page 232: ...230 Technical Data CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
Page 238: ...236 Menu List CG Drives Automation 01 5326 01r3b 9 0R ULYH 96 9 0 U...
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