Megger VLF SIN-45 User Manual

Operation
25
4 Operation
4.1 Safety Circuit
Immediately after an operarating mode has been selected, the VLF SIN-45 test system
continuously checks the requirements of the safety circuit. In the event that at least one
requirement of the safety circuit is not fulfilled, the system disables HV operational
readiness. The operator is informed in the header about the existing discrepancy:
To be able to generate high voltage, the cause of the fault must first be eliminated.
If the safety circuit trips during HV operation, the system will immediately interrupt the
HV test. Subsequently the test object will automatically be discharged.
The following causes can interrupt the safety circuit:
Message Cause
Cable shield not properly
connected
Resistance between operating earth and protective
earth too high (>9 ±3 Ω). Check whether the earth
cable as well as the cable screen of the HV connection
cable are correctly connected and that the respective
connection points are making a good metallic contact.
HV cable not correctly
connected
The HV connection cable has not been properly locked
on to the HV output
.
System disabled by
EMERGENCY OFF
The EMERGENCY OFF switch has been
activated.
HV unit disabled by external
EMERGENCY OFF
The EMERGENCY OFF switch on the external safety
device has been activated.
HV Unit disabled by Interlock
Key
High voltage has been locked by using the key
switch
(see the next page).
Overtemperature in VLF
Sinus
The internal temperature monitor reports a raised
temperature of the HV components. The system can
only be started up again after a sufficiently long
cooling-down phase.
Make sure that the air inlets and outlets on the sides of
the housing are not covered.
VLF CR Test Boost is not
ready.
The VLF CR Test Boost reports an error that is not
defined with any greater precision or is not properly
connected.
Signalling
Possible error
messages

Megger VLF SIN-45 Specifications

General

Brand	Megger
Model	VLF SIN-45
Category	Test Equipment
Language	English