Page 42 · 5400 Series
TECSource
User’s Manual
If the current limit engages, the I
TE
Limit LED on the front panel will illuminate.
Operating at the current limit is common, especially when transitioning from one
temperature to another. There is no harm or danger to the
TECSource
when
operating in this condition.
Using the Voltage Limit
The
TECSource
also supports a software-controlled voltage limit. In most
applications, the voltage limit is not needed, and can be left at the maximum
setting, as the
TECSource
is a current output controller, and the voltage simply
goes to whatever voltage is required by the TEC. In fact, the voltage limit is a
relatively new feature to the Arroyo Instruments controllers because of its typical
lack of need. However, with the high output power of the
5400
, some
applications can benefit from this capability. By default, the voltage limit is set to
the rating of the instrument plus 2 volts, so it will not engage unless adjusted
lower.
It is important to understand that the voltage limit is a software imposed limit,
which means that the response time to over-limit conditions can be several
hundred milliseconds. During that response time, a significant over-voltage
condition can persist. However, with a properly set current limit, the device is still
protected from excessive power conditions, and should not pose any danger to
TEC devices due to the relatively short duration of the over-voltage condition.
For the voltage limit to engage, the following conditions must be met:
V Lim
in the main menu is set to
1V
or higher
Enable V Lim
is set to
Yes
in the
Advanced Menu
At least 25mA of TEC current
The last point is to ensure there is a sufficient current signal that can be used in
calculating the load impedance (and therefore limit the current to correctly limit
the voltage).
If the voltage limit engages, the V
TE
Limit LED on the front panel will illuminate.
The V
TE
Limit LED will also illuminate if the
TECSource
is operating at the
maximum output voltage available to the controller.
Operating at the voltage limit is common, especially when transitioning from one
temperature to another. There is no harm or danger to the
TECSource
when
operating in this condition.
V Lim
will be hidden from the menu if
Enable V Lim
is set to
No.
Summary of Contents for TECSource 5400 Series
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