33
Technical data
and start-up
PDU254
7.4.5
Pin 7 DO3, pin 16 DI0
Internal wiring
10
nF
Pin 16
DI0
Pin 7
DO3
K
On the one hand, pin 16
DI0
is used to supply the main contactors of the HV bus and, on the other hand, to
supply the internal logic of the active intermediate circuit discharge.
As soon as LV is applied to the device (pin 3
EN
) and the interlock circuit is closed, the relay (K) is energised
and pin 16
DI0
is connected to pin 7
DO3
. As a result, the main contactors actuated by pin 7
DO3
are closed.
As soon as the interlock circuit is opened, the relay (K) is de-energised again. As a result, the main contactors
are immediately opened.
7.4.6
Pin 19 IL1, pin 20 IL2
Internal wiring
10
nF
Pin 19
INL1
Pin 20
INL2
K
-48V INL-
Generator
Deckel-
Schalter
Pin 19
INL1
is the output signal of the interlock generator. The signal current amounts to 10 mA and flows
from the earth
GND
through the relay coil of the main contactor supply to all other devices in the interlock
circuit (to the corresponding feedback pin
INL2
). From the last device in the interlock circuit, the signal is lead
back to the PDU to pin 20
IL2
. In the PDU, the signal is lead back to the interlock generator via the lid-
operated switch.
The interlock generator (-48V) allows a maximum voltage drop of 30 V between
INL1
and
INL2
, which means
via all other devices in the interlock circuit as well.
lid-operated switch
