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Introduction Once high voltage is enabled, the system's safety circuit continuously checks all safety-
relevant parameters and switching operations of the system. Should the safety circuit
detect a deviation from the monitored requirements while in high vol
system automatically switches back to the 'Ready for operation' state. High voltage is
switched off and the HV output is discharged. The fault that occurred is shown in the
display and must be eliminated before test mode can be activated again.
Conditions of the
safety circuit
The following conditions must be fulfilled in order to perform tests under high voltage:
• The HV key switch must be in the position.
• The emergency off button must not be pressed.
• F-Ohm: The transfer resistance between protective earth and high voltage return may
not exceed 6 Ω (possible fault sources: poor earthing conditions or HV plugs that are
not securely bolted).
• The temperature within the system must be under a value which would jeopardise
operation.
Fault messages
The safety circuit checks the conditions in a hierarchical manner according to the
prescribed sequence and stops as soon as it detects a deviation. The following example
shows the system message after triggering of the F-Ohm monitor:
If a fault is directly resolved, its status changes to OK and the subsequent conditions are
checked.
The safety circuit can also be queried before the start of a test while the system is in the
'Ready for operation' state by means of a menu item provided for this purpose (see
Key switch OK
Emergency OFF switch OK
F-Ohm Error
Overtemperature ?
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