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262 Unidrive SPM User Guide
www.controltechniques.com Issue Number: 3
13.21.10 Fast Disable
Software V01.10.00 and later
This bit is a duplicate of Pr 8.09 and reflects the state of the enable input.
With software V01.10.00 and later, if the destination of one of the drive
digital I/O (Pr 8.21 to Pr 8.26) is set to Pr 6.29 and the I/O is set as an
input, the state of the input does not affect the value of this parameter as
it is protected, however, it does provide a fast disable function.
The SAFE TORQUE OFF (SECURE DISABLE) input to the drive (T31)
disables the drive in hardware by removing the gate drive signals from
the inverter IGBT's and also disables the drive via the software system.
When the drive is disabled by de-activating the SAFE TORQUE OFF
(SECURE DISABLE) input (T31) there can be a delay of up to 20ms
(typically 8ms) before the drive is disabled. However, if a digital I/O is set
up to provide the fast disable function it is possible to disable the drive
within 600μs of de-activating the input. To do this an enable signal
should be given to both the SAFE TORQUE OFF (SECURE DISABLE)
input (T31) and to the digital I/O selected for the fast disable function.
The state of the digital I/O including the effect of its associated invert
parameter is ANDed with the SAFE TORQUE OFF (SECURE DISABLE)
(T31) to enable the drive
6.29 Hardware enable
RO Bit NC PT
Ú
OFF (0) or On (1)
Ö
If the safety function of the SAFE TORQUE OFF (SECURE
DISABLE) input is required then there must not be a direct
connection between the SAFE TORQUE OFF (SECURE
DISABLE) input (T31) and any other digital I/O on the drive.
If the safety function of the SAFE TORQUE OFF (SECURE
DISABLE) input and the fast disable function is required then
the drive should be given two separate independent enable
signals. A safety related enable from a safe source
connected to the SAFE TORQUE OFF (SECURE DISABLE)
input on the drive. A second enable connected to the digital
I/O on the drive selected for the fast disable function. The
circuit must be arranged so that a fault which causes the fast
input to be forced high cannot cause the SAFE TORQUE
OFF (SECURE DISABLE) input to be forced high, including
the case where a component such as a blocking diode has
failed.
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