Page 42 · 6300 Series ComboSource User’s Manual
Auto Fan is turned on whenever the TEC output is on, and turns off when the
TEC output is turned off.
On Fan is always on.
Delay Similar to the Auto mode, the fan is turned on whenever the TEC output
is on, but when the TEC is turned off, the fan will remaining running for
an addition number of minutes as defined by the Ext Fan Off setting.
Cool Fan is turned on whenever the TEC output is on and cooling, off
otherwise.
Heat Fan is turned on whenever the TEC output is on and heating, off
otherwise.
Resistive Heaters and Heat/Cool Only Modes
The ComboSource supports temperature control using resistive heaters instead
of Peltier coolers. With resistive heaters, cooling is obviously not possible, and
the ComboSource must be configured to not attempt to cool the output, or a
run-away condition will occur when the cooling current actually causes
additional heating.
If your application requires, you can also configure the ComboSource to
operate in a cool-only mode. This is only possible with Peltier coolers, as
resistive heaters will heat regardless of the direction of current.
To change the cooling mode, adjust the H/C Mode setting to Heat/Cool, Heat
Only, or Cool Only, as appropriate.
Gain Control and the PID Loop
The ComboSource supports a fully configurable PID loop, allowing full
customization of the PID control parameters. To simplify control, eight standard
gain settings are also defined, and many applications can achieve acceptable
performance with these predefined gain settings, eliminating the need to
understand and adjust the PID loop.
The predefined gains are numbered 1 through 300, and set using the Gain
menu setting. Increasing the gain value will increase the speed of the control
loop. For full access to the PID parameters, change the Gain setting to PID, and
the individual P, I, and D values will be available as settings in the menu.
The PID parameters function within a mathematical formula as described below:
dt
d
DdtIPOutput
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