Shelf Manager ACB-VI
Fan Control
16
R1.2, March 2018
9.1 Schroff Fan Trays
9.1.1 Control characteristics (examples)
Figure 14: Fan Speed Control (PWM) for Shelves 11592-50x
Figure 15: Fan Speed Control (Control Voltage) for Shelves 11592-40x
Figure 16: Fan Tacho Signal Output
Table 2: Fan Tacho Data
12706964
1000
0
2000
3000
4000
5000
0
20
40
60
80
100
PWM (
%
)
Fan
Speed
(rpm)
Speed-up
Speed-down
12706965
1000
0
2000
3000
4000
5000
6000
0
2
4
6
8
10
Contro
l
Vo
l
tage (V)
Fan
Speed
(rpm)
12706966
Tacho Signa
l
1 rev
t
t
1
2
Fan Speed
U
S Low
U
S High
n
min
n
max
n
U
S
t
t
Description
Comment
Value
Tacho Type
/2 (open collector)
Tacho operating voltage
up to 30 V
Tacho level low
I
SINK
= 2 mA
< 0.4 V
Output Frequency
(2 x n) / 60 Hz
