Tettex MIDAS 2881, Operating Instructions Manual

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94 Accessories and Options

Press in menu "Manual" to activate the inductance visualisation display on the
MIDAS to support the tuning of the resonating inductor.
Rotate lever to “Unlocked” position and coarse-balance using
the hand wheel and the analogue scale on the frontpanel of the
inductor
Set voltage in the range of 500 V .. 2 kV and adjust with the
hand wheel the phase shift
as small as possible or at least wihin the green range.
The display shows actual tuning. Beside the top value display a “L+” or L-“ instruction pops up
when the optimal tuning range is left. “Phase shift 180°” can be used when the direction of the
controls (depending on how the inductor is wired) works inverted.
Increase the high voltage in small steps (2 kV) and optimize
balance as required. Always wait until the measured value is
stable before you set a new value. When optimum balance is
achieved, move the lever to “Locked” position to firmly clamp
the core and thus reduce noise.
Before switching off the system, the high voltage shall be
reduced under 5 kV.
After usage of the the resonating inductor:
- Disable the resonating Inductance in menu "Setup", otherwise
the high voltage transformator will not be protected against
overcurrent.
- Set the inductance gap back to a medium position. This
protects the end position switches and also the core of the
inductor against mechanical wear.