Connection "remote"
17
AI Rotation speed setting mode / Pin 7 and Pin 11
The analog input defines the set rotation speed of the turbopump. An input signal of 2 -
10 V between AI+ (Pin 7) and AI- (Pin 11) corresponds to a rotation speed within the
range of 20 - 100% of the nominal rotation speed. If the input is open or signals fall below
2 V, the pump is accelerated up to nominal rotation speed.
6.2.3
Outputs
The digital outputs at the connection "
remote
" can be loaded with a maximum of 24 V /
50 mA per output. All outputs listed below are configurable by the Pfeiffer Vacuum pa-
rameter set via interface RS-485 (description related to factory settings).
DO1 (Rotation speed switchpoint attained) / Pin 8
Active high after the rotation speed switchpoint is attained. Rotation speed switchpoint 1
is factory-set to 80% of the nominal rotation speed. It can, for example, be used for a
"pump operational" message.
DO2 (No errors) / Pin 9
When the supply voltage has been established, digital output DO2 permanently outputs
24 V DC which means "no errors". Active low in case of error (collective error message).
DO Remote priority active / Pin 23
Active high: The connection "
remote
" takes priority over any other connected control
panels (e.g. RS-485). With active low, the connection "
remote
" is ignored.
AO1 Analog output 0-10 V DC / Pin 12
A rotation-speed-proportional voltage (0-10 V DC equals 0 - 100 % x f
Nominal
) can be
picked up via the analog output (load R
≥
10 k
Ω
). Additional functions (optionally current/
power) can be assigned to the analog output via DCU, HPU or PC.
6.2.4
Relay contacts (invertible)
Relay 1 / Pin 15, Pin 16 and Pin 17
The contact between Pin 16 and Pin 15 is closed when the rotation speed switch point
is underrun; relay 1 is inactive. The contact between Pin 16 and Pin 17 is closed when
the rotation speed switch point is attained; relay 1 is active.
Relay 2 / Pin 18, Pin 19 and Pin 20
The contact between Pin 19 and Pin 18 is closed when a malfunction is present; relay 2
is inactive. The contact between Pin 19 and Pin 20 is closed when operation is malfunc-
tion free; relay 2 is active.
Relay 3 / Pin 21 and Pin 22
The contact between Pin 21 and Pin 22 is closed when no warning messages are active;
relay 3 is inactive. The contact between Pin 21 and Pin 22 is open when a warning mes-
sage is present; relay 3 is active.
6.2.5
RS-485
One Pfeiffer Vacuum display and control panel (DCU
or
HPU)
or
an external PC can be
connected respectively to the electronic drive unit via Pin 24 and Pin 25 of the connec-
tion "
remote
" on the electronic drive unit.
Establish the connections according to the specification of the interface RS-485.
f(%)
100
20
2
10
U(V)
