TC-10 User Manual
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version 3.9
page 11
3.5. Modes of Operation
The system can be used in the following modes of operation:
DIRECT MODE:
output voltage is set directly by the DESIRED TEMP. °C control.
Internal SENSOR mode: output voltage is controlled by the PI controller using SENSOR A or
SENSOR B.
EXT. SENSOR mode:
output voltage is controlled by the PI controller using an external
thermometer.
DIRECT mode
DIRECT mode (no temperature control): the MODE switch (
14
, Figure 1) is set to the DIRECT
position. The control unit is not active, i.e. the output voltage is preset directly at the DESIRED
TEMP. control ((
1
, Figure 1). With the setting from 000 to 999 the output voltage increases
linearly from 0 V to 12 V. The ALARM circuit (see below) is disabled in this mode.
The TC-10 is designed with an unipolar output (0-12 Volt DC). If a resistive load is used, the
system can be used for heating purposes in all modes (SENSOR and DIRECT).
Internal SENSOR mode
In this mode the output voltage is controlled by the PI controller (PI [proportional-integral
controller system] activated). The temperature signal which is used for the control unit is
selected by the MODE switch.
The SENSOR A or SENSOR B position selects one of the internal thermometers
(SENSOR A or SENSOR B) which use a small semiconductor sensor. The measured
temperature is shown at the respective digital display unit (
2
or
6
, Figure 1 respectively,
XX.X °C).
If no sensor is connected or if the sensor is damaged or short circuited the internal shut-
off unit disconnects the power output. This state is indicated by the red ALARM LED
(
3
or
7
, Figure 1 respectively) located just above the sensor connectors.
Caution
: The temperature sensors are very sensitive to mechanical stress, especially to bending.
Therefore, they must be handled with great care to avoid breaking of the insulation!
EXT. SENSOR mode
This mode can be used to connect an external thermometer. The calibration of the external input
(SENS. INPUT BNC, (
15
, Figure 1)) is 1 mV / °C. If this option is used the internal ALARM
circuit is disabled.
POWER OUTPUT is always available at POWER OUTPUT, SENSOR A and SENSOR B
connectors.
Caution
: Do not operate heating devices with too much voltage! Refer to the respective manual
of the device for maximum voltage allowed, and use the LIMITER (
8
) when necessary!!