Diaphragm Vacuum Pump N 828 / N 838
Installation and connection
Translation of original Operating and Installation Instructions, English, KNF 121249-121517 09/19
29
Input signal speed control U
Ctrl
Analog
Control voltage range DC
[V]
0…5
Control voltage description
min.
pump min. flow
max.
pump max. flow
[V]
min.
max.
0.1
5
Max. input voltage
[V]
5.5
Treshold voltage
[mV]
25 ± 0.5
PWM-Signal
PWM frequency range
[Hz]
100
[50 … 150]
Input level “high”
[V]
5
[4.2 … 5.5]
Input level “low”
[V]
0
[0 … 0.9]
Duty cycle range
[%]
0 … 100
Duty cycle description
min.
pump min. flow
max.
pump max. flow
[%]
min.
max.
2
100
Input impedance @ 1kHz
[kΩ]
≥ 12
Output signal speed U
Spd
Analog
Pulses per revolution
[-]
1
Pulse duty cycle
[%]
50 ± 1
PWM-Signal PWM frequency
[Hz]
50 ± 0.5
Output level “high“
[V]
5
[4.1 … V
5V
]
Output level “low“
[V]
0
[0 … 0.6]
Max. current carrying capacity
[mA]
10
Output impedance @ 1 kHz
[kΩ]
≥ 9
Input signal Remote ON/OFF U
Rmt
Input level „high“
motor ON
[V]
5
[3.9 … 5.5]
Input level „low”
motor OFF
[V]
0
[0 … 0.9]
Input impedance @ 1 kHz
[kΩ]
≥ 1.8
Tab. 13 (part 2): Connection plan motor electronics UN 8__ K_.29DC-B
Output signal fault U
Flt
Input level „high“
error detected
[V]
5
[3.9 … 5.5]
Input level „low“
no error
[V]
0
[0 … 0.9]
Max. current carrying capacity
[mA]
10
Output impedance @ 1kHz
[kΩ]
≥ 9
Tab. 13 (part 3): Connection plan motor electronics UN 8__ K_.29DC-B