Bucher EMD G 0 Series, Hardware Manual

Page: 35 / 80

Technical data
Control of MOBILE DCU, PSU, DCU PSU
Interlock
4
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35
300−I−9052003−EN−04/07.2021
4.3.4 Interlock
An HV interlock system monitors the correct connection of connectors in the HV supply of
a vehicle with the aim of preventing an electrical hazard due to unintentional, improper or
otherwise caused disconnection of an HV connector while the HV supply is switched on.
For this purpose, the HV system is equipped with a so−called pilot or interlock line (HVIL or
High Voltage Interlock Line). This is an LV signal that is routed via several connectors or
connections. If the circuit of the pilot line is interrupted by the removal of one of the
connectors and the resulting disconnection of the pilot contacts in the connector, this is
detected by the vehicle control unit and the control unit immediately opens the HV main
relay(s), thus switching off the HV system.
The MOBILE DCU and PSU devices feature intelligent HVIL interlock functionality that is
activated when the cover is removed.
With the two pins InterLock1 and InterLock2 on X31 of the MOBILE unit it can be integrated
into a HV network. In contrast to simple HVIL contacts in HV connectors, the status of the
protective device (cover mounted or removed) is also available on the CAN bus and thus the
location of the interruption can be diagnosed.
)
Note!
The cover sheet must be mounted correctly to ensure trouble−free operation of
the Interlock.
ƒ
MOBILE DCU (EMDxG2...) (
¶
16)
ƒ
MOBILE PSU (EMDxG3...) (
¶
17)
ƒ
MOBILE DCU/PSU (EMDxG4...) (
¶
18)
Digital switching output
LV on−board supply system
12 V 24 V
Max. switching voltage V DC 60 60
Voltage potential to X31/20, X31/21 V DC −60 ... 60 −60 ... 60
Max. permissible capacitive load
1)
m
F 22 22
InterLock−OK (closed)
Contact resistance
W
6 ... 15 6 ... 15
Max. current mA 50
InterLock−NOK (open)
Max. fault current
m
A 1 1
1)
In case of a higher capacitive load, provide for an external current limitation, e.g. by means of a resistor in series
connection