Voltage dips, voltage variations
Depending on the preselected test parameters, the test voltage is changed to a higher or to a lower value for a
certain duration and at a certain phase angle.
Voltage variations are normally related to the nominal value of the supply voltage. Therefore two different variacs
shall be connected at the rear side of the simulator.
- PF1 Nominal voltage
- PF2 Under- / overvoltage
The operation mode U shall be preselected. The voltage
variation is realized by switching the power supply from channel
PF1 to channel PF2.
If a motor driven variac is available, it is also possible to drive the
source by an analogue voltage 0 - 10V. This control voltage is
available at the coaxial output at the rear part of the simulator
The control voltage is to be set via the operator menu or the interfaces of the Power Fail. A complete user
software to drive ramps and functions is also available
DC Power networks
Basically there is no difference in the operation of the equipment between AC and DC power supplies. The only
point the user should take care of are the grounding conditions.
The voltmeter, the "MONITOR" output and the LED are related to protective earth or to the simulator’s chassis,
respectively. Therefore these instruments can be used to check line or neutral and to measure at the output CRO
V while the test procedure is running.
It results for the DC power supply operation:
- If it is possible to ground the "MINUS" pole of the DC supply, from the EUT point of view, the blue output plug
(minus) should be connected to the green/yellow plug.
- By this way the power supply source connected at the rear side of the simulator might be grounded.
All measuring facilities are available if
- it is not possible to ground the "MINUS" pole and therefore the voltmeter cannot indicate the DC voltage.
- the phase indication led at the EUT supply input are not glowing
- there is no signal at the "CRO V" output.
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