Danfoss VLT CDS302 Operating Instructions Manual page 10

Safety Instructions and Gen...
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Illustration 2.3 Installation to Achieve a Stopping Category 0 (EN
60204-1) with Safety Cat. 3 (EN 954-1) / PL "d" (ISO 13849-1) or
SIL 2 (EN 62061).
1 Frequency converter
2 [Reset] key
3 Safety relay (cat. 3, PL d or SIL2
4 Emergency stop button
5 Short-circuit protected cable (if not inside installation IP54
cabinet)
Table 2.4
Safe Stop Commissioning Test
After installation and before first operation, perform a
commissioning test of the installation using safe stop.
Moreover, perform the test after each modification of the
installation.
Example with STO
A safety relay evaluates the E-Stop button signals and
triggers an STO function on the frequency converter in the
event of an activation of the E-Stop button (See
Illustration 2.4). This safety function corresponds to a
category 0 stop (uncontrolled stop) in accordance with IEC
60204-1. If the function is triggered during operation, the
motor runs down in an uncontrolled manner. The power
to the motor is safely removed, so that no further
movement is possible. It is not necessary to monitor plant
at a standstill. If an external force effect can occur, provide
additional measures to prevent any potential movement
(for example mechanical brakes).
NOTE
For all applications with Safe Stop it is important that short
circuit in the wiring to T37 can be excluded. Exclude the
short circuit as described in EN ISO 13849-2 D4 by the use
of protected wiring (shielded or segregated).
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Operating Instructions VLT
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37
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MG34M302 - VLT
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CDS302 and CDS303
Example with SS1
SS1 corresponds to a controlled stop, stop category 1
2
according to IEC 60204-1 (see Illustration 2.5). When
activating the safety function, the frequency converter
performs a normal controlled stop. This can be activated
through terminal 27. After the safe delay time has expired
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on the external safety module, the STO will be triggered
and terminal 37 will be set low. Ramping down as
configured in the frequency converter. If the frequency
converter is not stopped after the safe delay time, the
activation of STO will coast the frequency converter.
NOTE
When using the SS1 function, the brake ramp of the
frequency converter is not monitored with respect to
safety.
Example with Category 4/PL e application
Where the safety control system design requires two
channels for the STO function to achieve Category 4/PL e,
implement one channel via Safe Stop T37 (STO) and the
other by a contactor. Connect the contactor in either the
frequency converter input or output power circuits and
controlled by the Safety relay (see Illustration 2.6). The
contactor must be monitored through an auxiliary guided
contact, and connected to the reset input of the Safety
Relay.
Paralleling of Safe Stop input the one Safety Relay
Safe Stop inputs T37 (STO) may be connected directly if it
is required to control multiple frequency converters from
the same control line via one Safety Relay (see
Illustration 2.7). Connecting inputs increases the probability
of a fault in the unsafe direction. A fault in one frequency
converter can result in all frequency converters becoming
enabled. The probability of a fault for T37 is so low, that
the resulting probability still meets the requirements for
SIL2.
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