MPT 700
36
Example:
Parameters entered:
heating/cooling limit
⇒
50%
dead
zone
⇒
10%
Working areas:
cooling
0...45%
⇔
-100 ... 0 % output
heating 55...100%
⇔
0 ... +100 %
output
dead
zone
45...55%
⇔
0 % output
•
If this parameter is set to 0%, corresponding to no dead zone, there is an abrupt
switchover between heating and cooling.
⇒
In the event of fluctuations in the setting around the heating/cooling limit, the
unit will therefore switch repeatedly between heating and cooling.
A small dead zone should therefore be set.
•
CAUTION: heating/cooling limit and dead zone for 0/4...20mA controllers
1. Limit:
The limit is given by the useful range of the controller.
Example: limit = 50%
0...20mA controller: 50% of 20mA (limit at 10mA)
4...20mA controller: 50% of 16mA (limit at 12mA)
2. Dead zone: The dead zone is also determined by the useful range of the
controller.
