8
Control board
The HEX 30 is controlled via a controller that controls the speed
of the fans.
Control system
The key features of the controller are:
•
Onboard temperature sensor (NTC type)
•
Microprocessor based control in accordance with prese-
lected strategy
•
Minor and major alarm output
•
Polarity protection
•
Input voltage ÷ 40 V DC to -60 V DC
•
Both alarm outputs are “Normally closed” (NC)
•
Minor alarm is high temperature inside the cabinet >60 °C
•
Major alarm is when the internal, external or the tempera-
ture sensor fails
Part
Function
RS 232
To be used for factory testing or to get further information from
the controller
Alarm LED
Gives signal about alarms:
•
Flashing = minor alarm (high temperature)
•
Constant = major alarm (fan or sensor failure)
Both alarms can be monitored (potential free contact) on the
power/alarm plug.
See more about fault finding in section “Fault finding guide”,
page 21
Sub-D 9 pin, male Power and alarm plug
Pin designation:
1 N/C
2
+ 48 V DC
3
+ 48 V DC
4 Minor
alarm
+
5 Major
alarm
+
6
0 V DC
7
0 V DC
8
Minor alarm ÷
9
Major alarm ÷
