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Operation principle
1. The Safe torque off activates (the activation switch is opened, or safety relay contacts
open).
2. The STO inputs of the drive control unit de-energize.
3. The control unit cuts off the control voltage from the output IGBTs.
4. The control program generates an indication as defined by parameter
31.22
(see
the firmware manual of the drive).
The parameter selects which indications are given when one or both STO signals
are switched off or lost. The indications also depend on whether the drive is running
or stopped when this occurs.
Note:
This parameter does not affect the operation of the STO function itself. The
STO function will operate regardless of the setting of this parameter: a running drive
will stop upon removal of one or both STO signals, and will not start until both STO
signals are restored and all faults reset.
Note:
The loss of only one STO signal always generates a fault as it is interpreted
as a malfunction of STO hardware or wiring.
5. The motor coasts to a stop (if running). The drive cannot restart while the activation
switch or safety relay contacts are open. After the contacts close, a reset may be
needed (depending on the setting of parameter
31.22
). A new start command is
required to start the drive.
The Safe torque off function 189
Содержание ACH480
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Страница 156: ...Frame R1 Frame R1 front side IP20 UL open type 156 Dimension drawings ...
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Страница 158: ... Frame R1 front side UL Type 1 kit installed 158 Dimension drawings ...
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Страница 162: ... Frame R2 front side UL Type 1 kit installed 162 Dimension drawings ...
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Страница 164: ...Frame R3 Frame R3 front side IP20 UL open type 164 Dimension drawings ...
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Страница 166: ... Frame R3 front side UL Type 1 kit installed 166 Dimension drawings ...
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Страница 168: ...Frame R4 Frame R4 front side IP20 UL open type 168 Dimension drawings ...
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Страница 170: ... Frame R4 front side UL Type 1 kit installed 170 Dimension drawings ...
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Страница 198: ... Declaration of conformity 198 The Safe torque off function ...
Страница 206: ...Dimensions 206 BIO 01 I O extension module ...
Страница 212: ...Dimensions 3AXD50000031148 rev A 212 BREL 01 relay output extension module ...