Lakeshore 336, User Manual

Page: 81 / 192

4.5.1 Heater Outputs 69
|
www.lakeshore.com
4.5.1.5.8 Heater Range
The Heater Range setting is used for turning a control output on, as well as setting the
output power range for the heater outputs. All four outputs provide an Off setting for
turning the output off. The heater outputs, 1 and 2, provide Low, Medium (Med), and
High settings which provide decade steps in power, based on the maximum output
power available to the connected heater. The High range provides the maximum
power, the Med range provides (maximum power)/10 and the Low range provides
(maximum power)/100. Refer to section 2.5.1 for details on how to calculate the max-
imum output power. The unpowered analog outputs, 3 and 4, do not have multiple
output ranges, and only provide an On setting for enabling the output.
While controlling temperature, the following will cause the heater range to automati-
cally turn off:
D
Exceeding the Temperature Limit setting
D
Setup changes to the control input
D
Power loss with Power Up Enable feature turned off
D
Input errors such as T. Over, T. Under, S. Over, and S. Under
Available full scale current and power are determined by the heater resistance, Max Cur-
rent setting, and Heater Range.
Specifications of the heater outputs are provided in section 1.3. Heater theory of
operation is provided in section 2.5. Various heater installation considerations are
provided in section 3.8.
To set Heater Range, first configure the front panel display to show the desired control
loop information, then use the
Heater Range key on the front panel. A quick way to
access the setting if the control loop information is not already being displayed is to
press
A , B , C , or D on the front panel to temporarily display the control loop informa-
tion while the new setting is entered. Refer to section 4.2 for details on configuring
the front panel display.
Menu Navigation:
Heater Range
Q
(Off, On, Low, Med, High)
Default: Off
Interface Command:
RANGE