Dantherm HEX 70, Руководство по обслуживанию

Страница: 9 / 26

9
0
6
7
3
3
3
•
V
e
rsi
o
n
1
.0
•
2
9
.0
6
.2
0
1
1
Control board
Introduction
This section describes key features of the control board and how it operates.
Control system The illustration on the right and the table below describe the
control board.
HEX 70/90/120 is controlled via a controller that controls the
speed of the fans.
The key features of the controller are:

Onboard temperature sensor (NTC type)

Microprocessor based control in accordance with preselect-
ed strategy

Shared alarm output

Polarity protection

Input voltage ÷ 40 V DC to -60 V DC

Alarm output is “Normally closed” (NC)

Sensor failure alarm (LED)

Fan and high temperature failure alarm (LED)
Part Function

RS 232 For factory testing and further information from the controller

Alarm LED Alarm signals:

Flashing: sensor failure

Constant = fan failure or high temperature
Alarms can be monitored (potential free contact) on the pow-
er/alarm plug.
See more about fault finding in the section “Preventive mainte-
nance
”, page 12.

9 pin,
sub-D, male
Power and alarm plug
Pin designation:
1
N/C (not connected)
2 + 48 V DC
3 + 48 V DC
4 NC
5 Alarm +
6 0 V DC
7 0 V DC
8 NC
9 Alarm ÷

9 pin,
sub-D, female
When this plug is removed, testing the fans can be done. Fans
will run at maximum speed when the plug is removed.
NB: The plug should always be mounted during normal opera-
tion



