DIGITAL-LOGIC MPC25/L, Technical User'S Manual

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DIGITAL-LOGIC AG
MPC25/26 Manual V1.1
24
3. S
AFETY
R
EGULATIONS
Safety verifications follow the guidelines adapted from the US Army Communication and Electronics
Command Supplement (1992 version) 1 to AR385-16.
3.1. Safety: Power-On Indicator
The green power indicator is located in the front of the computer system. [MIL-STD-1472D]
3.2. Safety: Coded and Marked Connectors
All connectors (plugs and receptacles) are coded and marked to prevent insertion of the wrong plug into a
receptacle or other mating unit [MIL-STD-1472D]. Depending on the mounted replicator unit, the connectors
are PC-Style, DSUB or MIL versions. The male connectors are de-energized when disconnected. [MIL-STD-
454M]
3.3. Protection of the Supply Input Current
Note…
The computer system protects the internal supply from overcurrent by an external fuse of 6.3amp.
In case of an overcurrent the fuse opens the main circuit and interrupts the fault current. [MIL-
STD-454M]
3.4. Safety: Wrong Polarization on the Power Input
Attention!
The supply input is protected against wrong polarization with a serial diode. This diode withstands
current up to 28Volts.
3.5. Safety: Protection of the Output Currents
There is no overcurrent protection on any peripheral port. The following table shows the maximum available
current at each peripheral connector:
Connector Nominal maximum current
USB 0.5 Amp. @ 5V
KB/MS ----
DVI 0.1 Amp. @ 5V
3.6. Safety: Load Dump Protection in 12V systems
There is no integrated protection against load dump!
If the computer system will be installed in a vehicle (car, truck, train),
an external, overvoltage protection must be attached. Connecting a
zinc oxide based metal oxide varistor (MOV) directly at the supply input
connector is recommended. Use a typical 20V clamp voltage for the 12
systems.
Example:
Varistor: B72220S200K (Infineon) Vbreak=20V