Quick Installation Guide

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WERA4-Quick-US-200918

Page 37 of 73

The user interface PC will be delivered with an additional transportation protection inside.

This protection needs to be removed before switching on. Keep this protection

material for future transportation.

If the system is connected correctly, the user interface PC is directly connected to the UPS

and can be started without switching on the WERA system.

Turn on the PC and wait until Linux has booted. Please check if there is access to WERA

Desk.

Turn on the WERA system with the main switch at the front of the lower rack.

The green LED of the Clock Generator (top left) should be on immediately.

After about 30 seconds the green LED of the State Machine (STM) should turn on. This

indicates that the internal PC has booted. If this LED does not illuminate, please check the

connections at the front and rear. The internal PC can’t boot before the user interface PC

has booted. If the user interface PC needs to be restarted the systems CL7 needs to be

restarted as well or measurement data may not be saved.

5.12 Calibrations

5.11.1. Full Calibration

Please do not use this calibration, it takes 3 hours to run and was already carried out at

the factory. It may be required in case of a major system fault and the replacement of the

receivers only.

5.11.2. Internal Calibration

Even if this internal calibration was carried out at the factory as well, it should be checked

to verify if everything is ok after transport.

Start an Internal Calibration under the WERA Control Center. Use settings for a short

run:

256 samples, 0.260 sec sweep time, 80 Hz offset

Check the results using “Plott_WERA_Cal_lsq” according to the description in pos. 11.7.

In the resulting table all RMS-Voltage should be almost identical and the “Cal values”

should be between 1.0 and 1.1.

In the second part of the table are the phase values listed. At the “Peak” the phase should

be between +6 to -6 degrees.

Finally the “I/Q-Balance” should be between 84 and 96 degrees.

If the results are ok, the name of this calibration file and its results should be changed to

calibration.wera_internal and should be noted in the log book. It may be helpful for future

trouble shooting.