JUMO 709050 IPC IGBT Power Converter IPC 200A Operating Manual - Manual (Page 37)

IGBT Power Converter 200A [Patent No. EP1 126 591 B1] 02.08 37
5 Settings
5.8 Trimmer settings
The converter has 6 trimmers that can be adjusted by inserting a screwdriver
blade (maximum blade width: 2 mm) through openings in the housing.
5.8.1 Resistance limiting (R-control)
The switch S101-10 can be used to activate a limiting of the output power
depending on the resistance value R when operating Molybdenum Disilicid
heating elements, to avoid overheating of the elements in the upper
temperature range. Direct measurement of the resistance of the elements
allows precise determination of the element temperature. When switch S101-
10 is closed, the converter limits its output power as soon as the element
resistance (the element temperature) is reached that was set by the trimmer for
„resistance control adjust“. In this manner, the heating element is protected
from overheating. The "R-control" LED signals the active status of the
resistance limiting.
Factory setting The R-control trimmer is not factory-set. An appropriate adjustment must be
carried out on site to set the maximum temperature limit for the heating
element. This can be carried out with the aid of load voltage and current
measurement (resistance measurement) or with the help of a thermal imaging
camera.
current limit adjust
load fail adjust
max. Power adjust
min. Power adjust
output adjust P I 2 U , , 2
resistance control adjust
A
A true-rms meter must be used for measuring voltage, power or
current, because the load current is pulsating DC.
A meter calibrated for alternating current (AC) and sinusoidal
waveforms will produce false readings!