Connection "X3"
17
6.2.2
Inputs
The digital inputs at connection "
X3
" are used to connect various functions of the elec-
tronic drive unit. Functions are assigned to the inputs DI1 - DI2 ex factory. These can be
configured via interface RS-485 and the Pfeiffer Vacuum parameter set.
DI Remote priority / Pin 2
V+ :
The connection "
X3
" has operation priority over all other digital inputs.
open: Remote priority inactive
DI1 (Enable venting) / Pin 3
V+ :
Venting is enabled (venting according to venting mode)
open: Venting locked (no venting is performed)
DI2 (Heating) / Pin 4
V+ :
Heating on
open: Heating off
DI Pumping station / Pin 5
The turbopump is placed in operation and connected pumping station components (e.g.
backing pump, venting valve, air cooling unit) are triggered. Any ongoing error messages
are reset when their cause has been eliminated.
V+ :
Malfunction acknowledgement and pumping station on
open: Pumping station off
DI Standby - Error acknowledgement / Pin 6
In standby mode, the turbopump operates at a specified rotor speed < nominal rotation
speed. Factory setting and recommended operation are 66.7 % of the nominal rotation
speed.
V+ :
Standby activated
V+ :
Reset ongoing error messages when cause has been eliminated with a pulse of
500 - 2000 ms duration
open: Standby off, operation at nominal rotation speed
6.2.3
Outputs
The digital outputs at the connection "
X3
" can be loaded with a maximum of 24 V / 50
mA per output. All outputs listed below are configurable by the Pfeiffer Vacuum parame-
ter 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).
Accessory outputs / Pin 10 and Pin 11
The accessory outputs can be loaded with a maximum of 24 V / 200 mA per output. Ad-
ditional functions can be assigned to the accessory inputs and outputs via DCU, HPU or
PC. Works settings:
●
Accessory output A1: A connected air cooling unit is activated.
