192-011006N8 PSD1 Installation Guide
192-011006N8 2019-07
09.10.19 09:27
77 (109)
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Functional description ............................................................................................................... 77
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Design Features ....................................................................................................................... 77
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Calculation of the total failure probability ................................................................................... 77
6.6.2.1
Circuit Diagram
In this example we show how the contacts of the safety door can be wired to the
1-axis PSD1 without the use of a safety control.
A double-channel safety door monitoring or a double-channel emergency stop can
be directly wired to the PSD1.
We do not recommend this type of wiring for vertical axes without self-locking
mechanics as it may be damaged at braking with the motor holding brake by motor
coasting. If this is the case we recommend to use the previous wiring type with
safety control.
6.6.2.2
Functional description
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When opening the safety door, the motor is immediately switched to
double-channel, moment-free mode; this complies with Stop Category 0 In
accordance with EN 60204-1. In case the motor axis is still energized or moving
during the triggering of the STO, error 0x5495 is triggered simultaneously. If not,
no error is triggered; unless error 0x5492 is triggered at setting STO_Setup=1.
Basically STO status is displayed in the Fieldbus Status Word Bit 15 and as
slowly flashing LED.
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During trundling of the motor the motor brakes of the Parker motor must not be
activated as otherwise they can be damaged.
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In case error 0x5492 or 0x5495 are triggered then error must be acknowledged in
order to reactivate the drive. The acknowledgement is only permissible with
category B. It shouldn't been used if there is a possibility to enter the dangerous
area. In this case an external acknowledgement device must be used.
6.6.2.3
Design Features
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The contacts of the emergency stop buttons and the safety door need to be
designed mechanically in accordance with EN 60947-5-1 appendix K.
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PSD must be located in a protected area (IP54 control cabinet). Outside this
protected area, the line guiding to the external switches must be separated
channelwise or must be especially protected.
6.6.2.4
Calculation of the total failure probability
The failure probability of each of the two STO circuits of the servo drive is 1.0E-09
per hour. When calculation the overall failure probability further components of the
complete machine such as contacts of the safety door must be considered.
Due to the hardware monitoring in the PSD servo drive, only a medium level of
diagnostic coverage DC for the external contacts can be set.
