Parker IQAN-XT2 - Safety Features and Considerations; Internal Diagnostics for Safety; Emergency Stop Implementation

6
Internal diagnostics
4 Safety
Instruction book, IQAN- XT2
4Safety
Internal diagnostics
The module performs a number of self-checks that improve safety. Checks include
monitoring of voltage supplies, checksums on memory and a watchdog that monitors
software execution. The module is using a real time operating system which supervises
software execution.
If a critical error is detected, the module is stopped, with CAN bus and outputs off.
CAN-bus interruption
The IQAN-XT2 communicates with an IQAN master module on the CAN bus. Both
the master and the IQAN-XT2 check for any interruptions in the CAN-bus
communication. If an error occurs the master will use zero or an application defined
error value for the module inputs, and the module outputs will be off.
The error will be indicated both on the master module and with a blink code on the unit;
see Appendix B, on page 27
Current check
For the proportional outputs when used in current mode, a current check is performed.
If an error is detected, this will be indicated on the master module, and the output will
shut off.
The XT2 module can detect open-circuit, short-circuit to +BAT/-BAT or short-circuit
to other proportional output and return pins.
Emergency stop
WARNING
Risk of injury! The emergency stop must disconnect the power supply to the module;
do not connect the emergency stop as a signal input only.
The emergency stop must be installed so that the risk of reverse feed of the module is
avoided, see section Emergency stop, on page 9.