Electrical Description of EGM
Status September 2003 (EvoBus-Service / AFT) Page: 45 of 83
3.1.3 Power supply of EGM
1. Supply voltage
Nominal voltage: 22 V < U < 30 V
Undervoltage: 8 V < U < 22 V limited
operating range
Overvoltage switch-off: U > 32 V
2. Reverse voltage protection, overvoltage
protection
Reverse voltage protection: continuous polarity reversal
of Ter. 30, Ter. 31 without
damage to system
components
Overvoltage resistance: 58 V
4. Power consumption
average power consumption
(ignition on, engine stopped)
0.2 A at U = 27 V
average power consumption
(at engine speed = 500 rpm)
1.7 A at U = 27 V
Peak power consumption
(without proportional output stages)
10 A, cyclical, dependent on
engine speed
5. Power loss
max. power loss: 20 W at 27 V
6. Short-circuit detection thresholds
Gas injector against return line typ. 25 A
Proportional valves against supply typ. 5 A
Prop return12 against supply typ. 10 A
Throttle valve against return line typ. 20 A
Fan supply against earth typ. 15 A
Starter against earth typ. 2.5 A
Lambda heating against return line typ. 3 A
7. Bias power consumption
with Ter. 15 off and after completing run-on I < 1 mA
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