Amphenol Kaye CTR-40, Руководство пользователя, Страница: 82 / 84

71
12 Troubleshooting
Problem Causes and Solutions
The controller alternately heats for
a while then cools
The bath is not stable and the duty cycle is not constant.
•
The proportional band being too narrow typically causes this oscillation.
Increase the width of the proportional band until the temperature stabi-
lizes as discussed in Section 8.9, Proportional Band.
The controller erratically heats then
cools, control is unstable
If both the bath temperature and output power do not vary periodically
but in a very erratic manner, the problem may be excess noise in the sys-
tem. Noise due to the control sensor should be less than 0.001°C. How-
ever, if the probe has been damaged or has developed an intermittent
short, erratic behavior may exist. The probe is located inside the stirrer
motor cover.
• Check for a damaged probe or poor connection between the probe and
bath.
•
Intermittent shorts in the heater or controller electronic circuitry may
also be a possible cause. Contact Amphenol Advanced Sensors
Customer Service for assistance.
The bath does not achieve low
temperatures
Too much heating or not enough cooling can cause this problem.
• Check that the control indicator glows green showing that the controller
is attempting to cool. The heaters may be disabled as a test by tempo-
rarily removing the heater fuses.
1 2 .2 Comments
1 2 .2.1 EMC Directive
This equipment has been tested to meet the European Electromagnetic Compat-
ibility Directive (EMC Directive, 89/336/EEC). The Declaration of Conformity
for your instrument lists the specific standards to which the unit was tested.
1 2 .2.2 Low Voltage Directive (Safety)
In order to comply with the European Low Voltage Directive (73/23/EEC),
This equipment has been designed to meet the IEC 1010-1 (EN 61010-1) and
the IEC 1010-2-010 (EN 61010-2-010) standards.