Dynamic Switch Off Di/Dt; Electrical Arc Detection; Monitoring Residual Energy; Functional Description - SCHNIER smart-E 310 Operating Manual

7.6. Dynamic switch off di/dt

Dynamic switch off di/dt is known extensively from older high voltage systems which
trigger for a fast increase in current and switches off high voltage. This is used to detect
a high voltage electrical arc. Especially in modern, dynamic processes, e.g, robotic
painting, this switch off leads to undesired shutdown and therefore standstill times
which, in practice, often means the di/dt function is deactivated and an important safety
feature is switched off. For the smart-E310 or 510 the di/dt switch off is replaced by s
significantly improved electrical arc detection.

7.7. Electrical arc detection

Electrical arc detection for the smart-E 310 or 510 is in a position to detect high voltage
electrical arcs without undesired switch off during dynamic processes such as robot
painting. The sensitivity can be set in 9 levels from 1 to 10. The highest sensitivity is at
level 1, accordingly the most insensitive level is 10. For 0, electrical arc detection is
deactivated.

7.8. Monitoring residual energy

7.8.1.
Once the HV generator is switched off, high voltage carrying parts of a system are still
energized due to their electrical capacity.
Before accessing the cabin, all high voltage carrying parts as described in the "Safety
instructions for operation, service and repair" section describes a safe value below
which discharge is done. This signals the residual energy monitoring system (monitor-
ing contact HV generator): as soon as the high voltage has been safety discharged, the
integrated relay closes the monitoring contact:
Relay contact
Closed
Open
* The safety threshold is permanently fixed, independently of the system configuration.
The value must be determined and verified scientifically.
Note: 24 V CPU must be applied to operate the relay. Switching off the 24 V DRIVE
however, is not checked, before the relay closes.
The residual energy monitoring is a safety function. In compliance with the specifica-
tions in this operating manual, the new editions of the smart-E devices have Perfor-
mance Level:
These devices have PL d details on the label of the model plate. Older devices without
this information do not have Performance Level d.
Operating manual 810378-BAL-EN-170330

Functional description

Condition
HV is switched off
AND
High voltage is discharged*
AND
Generator self-test is OK
All other conditions
ISO 13849-1:2008 Category 3 PLd
Mach/30 2017
Meaning
From the high volt-
age standpoint, the
system is safe to
access
Access must be
interlocked
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