Starter Kit Instruction Manual Maintenance 50
CAUTION ! For the further steps of this
check, limit the positive current to 1 A and
the negative one with 1.2 A by means of the
5 turns potentiometer)
Temperature limit threshold
[21] Measure the voltage on pin 2 of U10
(1).
Note: The value should be: 0.7V (= 70 ◦C)
(If needed,adjust it with the trimmer P9(2)).
[22] Power off the instrument.
Starting the power section of the instru-
ment.
[23] Remove the 100 E reference resistor from
J8 (4) and plug the output cable J8.
[24] Plug the external cable into the LLH100,
and verify that the Pt100 is proprely mounted
in the latter.
[25] Use an external power supply (0-30VDC/3A)
to simulate the internal power supply.
[26] Limit the current to 200 mA and connect
it to main board J1 connector (3).
[27] Poweron the instrument and the externa l
power supply.
1
2
Fig.45: TCU151 main board
3
4
Fig.46: TCU151 main board