18
If no signal is present the pump accelerates up to its final
rotation speed. A PWM adapter box for rotation speed setting
operations for the turbopump is available as an option (please
see Section 11. Accessories).
Switching Outputs
Switching outputs 1 and 2 can be loaded with a maximum
24 V / 50 mA per output. The following functions are assigned
to the switching outputs:
Switching output 1:
Active high when the rotation speed
switchpoint is attained. The switchpoint
for the turbopump is set at 80% of the
nominal rotation speed. It can be used,
for example, for a message ”pump
ready to operate”.
Switching output 2:
Active low with a malfunction -
collective malfunction message
The connection of a relay is made between pin 10 (mass) and
the respective switching output pin 8 or pin 9 (see Section
3.12. Connections Diagram).
Rotation Speed Setting Mode Via Input PWM
The supply of pulse width modulated signals (PWM) with a
ground frequency of 100 Hz ±20% with an amplitude of maxi-
mum 24 V and a key ratio of 25-75% enables the rotation
speed to be set in the range 20-100% of the nominal rotation
speed.
T
0
U
20%*f
100%*f
end
max. +33V
min. +13V
max. +7V
min. -33V
T
T
PWM
*25%
*75%
T
= 10ms (1
±
20%)
f
=100Hz (1
±
20%)
end
PWM
PWM
PWM
