Athena PIM Betriebsanleitung PDF herunterladen (Seite 12)

3- Thermocouple open or reversed:

If any TC fault is detected during closed-loop operation,

the output power will be cut off. If it is necessary to

apply power to the load during a TC fault condition,

the controller can be switched to manualmode. The

output power will be a function of the manual control

knob setting. Since the controller is now operating in

open-loop mode, extreme care must be taken when

adjusting to prevent excess output power which would

overheat the load.

4- No heatfault:

The IMP series controller has included in its

microprocessor a program which detects that the

temperature is not rising as it should in response to full

power output. “No Heat” is defined as the condition

under which the temperature does not increase more

than 2 degrees F during a 60-second interval during

start-up. It takes 60 seconds to detect “No Heat” when

power is first turned on in closed-loop mode, and longer

if CompuStep is active.

In the beginning of the CompuStep mode, only a small

amount of power is applied to the load and the rate of

temperature rise could be less than 2 degrees F (1°C) in

60 seconds. In order to compensate for this, the test is

not performed until one minute after power is turned

on. By that time, enough power is being applied to the

load to sustain the rate of 2 degrees F (1°C) in 60 sec-

onds. It takes 1 minute, 60 seconds to detect “No

Heat” in CompuStep mode when power is first turned

on. When “No Heat” alarm is detected, output power is

cut off.

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Athena PIM Betriebsanleitung Seite 12