bürkert 6650 Bedienungsanleitung Seite 8

The indicated values (power consumption) describe the heat
output. When designing the power supply, pay attention to appro-
priate reserves.
4.5.1 Continuos operation with power reduction
electronics
For the continuous operation of valve type 6650, a power reduction
electronics is required. It is recommended to use the electronics,
which is available as an accessory (see data sheet).
NOTE!
Malfunction due to overheating!
▶ The coil temperature must not exceed 110 ° C.
▶ If required, use suitable power reduction electronics.
▶ For a switch-on time > 50 s (for single mounting > 60 s) always use
a power reduction electronics!
▶ The electronics 670178, available as an accessory, are suitable for
a nominal voltage of 24 V only.
The following graphs provide a guideline for estimating whether a
power reduction electronics is required. If the gap between the indi-
vidual units is < 10 mm, use the graph for the block structure. A power
reduction electronics is not required if the intersection point of switch-
on and switch-off time is in the upper area of the corresponding graph.
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Single device
(Pulse / interval ratio at ambient temperature of 22 °C)
Example: 40 s on - 100 s off
→ power reduction electronics required
400
350
300
250
200
150
100
50
0
0 10 20
switch-on time [s]
7
6
5
4
3
2
1
0
0 0,5 1 1,5
switch-on time [s]
If the intersection point is on or below the plotted line or if the duty cycle
is longer than 60 seconds, power reduction electronics are essential.
30 40 50
2 2,5 3 3,5 4 4,5
60
5