Quick Installation Guide
Document
WERA4-Quick-US-200917
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 Centre. Use settings for a short
run:
256 samples, 0.260 sec sweep time, 80 Hz offset
Check the resul
ts 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 b6 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.
