JUMO 709061/8-01-032 Operating Manual page 20

2 Mounting
A
Site altitude
18
Destruction through overheating:
In the event of operation at maximum load current over an extended period,
the heat sink and its surroundings heat up.
For this reason, at ambient temperatures above 45 °C, the maximum load cur-
rent must be reduced as shown in the image, as the thyristor module would
otherwise be destroyed.
The device temperature shown on the display may not exceed 100 °C.
At a device temperature of >100 °C, the message "Warning - high tempera-
ture" is displayed.
At a device temperature of >105 °C, the output level is gradually reduced by
10 % of the nominal current each time the temperature increases by one de-
gree.
At a device temperature of >115 °C, the power controller is completely
switched off.
v Chapter 8 "Error messages and alarms"
In the case of air cooling, it must be noted that the effectiveness of the cooling
is reduced as the site altitude increases. As a result, the ampacity of the thyris-
tor power controller decreases with such a cooler as the site altitude increas-
es, as shown in the diagram.
Ampacity in %
100
80
60
Reduction over 1000m above sea level: 0,86 %/100m
40
20
1000
V1.04/EN/00561071 [Thyristor Power Switch TYA 201]
91,4%
2000 3000 4000
site altitude in m
5000
above sea level