26
GOSSEN METRAWATT GMBH
Balancing
Thermocouple Correction (parameter:
CAL
)
The correction value is selected in
°
C or
°
F. The displayed correction value is added to the measured temper-
ature.
Cable Compensation for Pt 100 with 2-Wire Connection (parameter:
CAL
)
The correction value can be determined automatically in the
“Off / manual operation”
mode:
–
Short circuit the sensor
at the measuring point
.
–
Set the
CAL
value to
Auto
.
Measured cable resistance is converted to temperature change and is entered as the
CAL
value.
Balancing can also be performed manually if the sensor temperature is known:
CAL
= known sensor temperature – displayed temperature value
Scaling for Heating Current Monitoring (parameter:
A
H
)
The default setting for the GTZ 4121 is 42.7 A. If the GTZ 4121 current transformer is not used for acquiring
heating current, the current value must be selected at which the utilized transformer generates an output volt-
age of 10 V DC.
Calibrating the Position Acknowledgement Display (parameter:
Y100
,
Y 0
)
Calibration is performed in the manual operating mode at the parameter level with the device configured as a
step-action controller (“controller sort” configuration digit = 6):
1.
Select parameter
Y 100
. The stored value appears at first: a standardized value between 0 and 255.
The scroll up key
controls switching output I directly (more), and the currently measured actuator
position appears at the display. The scroll up key
must be pressed and held until the displayed value
no longer fluctuates. The displayed value is saved to memory.
2.
Select parameter
Y0
.
Same procedure as for parameter
Y100
. In this case, the scroll down key
must be pressed and
held. It controls switching output II directly (less).
Y100
must be greater than
Y0
!
The
Y100
and
Y0
parameters are displayed only in the automatic operating mode.