22
Please note that when the ambient temperature is hot, as it often is the case in some
commercial
environment
, the temperature of the controller will get hotter. This is because the
heat dissipation is mostly determined by the temperature gradient (the temperature difference
between the ambient and the controller) instead of absolute temperature of the controller itself. If
the controller reaches 50 °C when the ambient is at 20 °C, it will reach 70 °C when the ambient
is at 40 °C.
Solutions to reduce the heat stress on the controller
.
1) Use hot water. If you fill the pot with hot water that has a temperature close to the set
temperature, the heat dissipation of the controller is not an issue. As we have mentioned, once
the temperature is close to the set point temperature, the controller starts to pulse (PWM) the
power. The effective current is much lower, making heat not an issue.
2) Limit maximum output power. If you set output reduction parameter to 80%, then, a 15A
heater
will become a 12A heater. It will take 25% longer time to heat up the pot, but the
controller will not over heat.
In addition to these solutions, following information will also help you to manage the heat. Place
the controller in the right place. The SSR of Auber WS series controller is mounted in the
bottom of chassis. The chassis is made of 3 mm thick aluminum for good heat dissipation. Do not
cover the controller with any insulation. If you are running at 15 A with a large pot, placing the
controller in a well ventilated area and tilting the instrument up with its front legs will help it to
remove heat more efficiently. However, the tilted position may result in water collected at the
back frame. Although the controller is splash proof, you should avoid water to be dripped on the
controller
.
Increase the P value. This can only provide limited help for reducing the heat. P is the
proportional band. P=200 means the proportional band is 20.0 degrees. When the temperature
is raised to less than 20 degree from the set point temperature, the controller will start to reduce
the power sooner. But if the integration time is set to very short, the controller might start to run
at full power again soon.
Copyright
2018
,
Kamweld Industries, Inc.
All Rights Reserved.
No part of this manual shall be copied, reproduced, or transmitted in any way without the prior, written consent of A
Kamweld
Industries
.
Kamweld Industries
retains the exclusive rights to all information included in this document.