External Safety Switch Operation; Booster Operation - ILX Lightwave LDT-5525 User Manual

2.6.4 External Safety Switch Operation

On the TEC connector, pins 13 (TEMP LIMIT) and 15 (DIGITAL GND) form a type of external safety switch (see
Figure 2.3). These two pins are normally not connected (open circuit), and must remain open for the TEC output to be
on. If there is a short circuit between these pins the TEC output will be disabled.
This circuit is useful for remote monitoring of temperature limit, and therefore is labeled TEMP LIMIT on the back
panel connector. This switch may be used with an external current booster. A switch or control circuit of the user's
own design is required. It is left as an option which the user may or may not employ.

2.6.5 Booster Operation

The LDT-5525 Temperature Controller may be used to control a booster current source which accepts a control signal
of up to +5.0 volts. A booster current source may be required if the LDT-5525 Temperature Controller's +4 A, 24 W
output is not adequate to control a thermal load.
Whenever a connection is present between the BOOSTER PRESENT (pin 14) and DIGITAL GROUND (pin 15) of the
back panel TEC connector (Figure 2.3) the TEC OUTPUT will be disabled. In this case, the BOOST CONTROL signal
voltage will be available for controlling a booster current source.
The booster current source should use the control voltage which is available between the BOOST CONTROL (pin 10)
and AGND (pin 9) of the back panel TEC connector.
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