Automatic Control System (Option); Functional Description - Atlas Copco XAHS 37 DD Instruction Manual

Instruction Manual
3.3.2 F
UNCTION OF GENERATOR
AUTOMATIC CONTROL SYSTEM
F
UNCTIONAL DESCRIPTION
X1 X2
Fig. 3.23 Control panel (generator)
H3 Lamp (green, power ON)
S7 Switch (generator - compressor)
H4 Lamp automatic control system
S8 Switch automatic control system
X1 Socket 110 V/ 32 A
X2 Socket 110 V/ 16 A
X3 Socket 110 V/ 16 A
GND Terminal earth cable
As soon as the generator is switched on, the automatic control system
will continuously check for electric load in order to rev up the engine
from idle to nominal speed only when needed. This saves fuel and
reduces emissions.
What is more, with the current continuously monitored, a consumer
having just been switched on is temporary disconnected from the
generator to be re-connected as soon as the engine reaches nominal
speed. This is a safety mechanism to protect generator and engine
below nominal speed.
Fig. 3.24 Earth pin
Before switching on the generator, always place the
earth pin in position. Check the cable connection
between earth pin and the GND-terminal on the unit.
DDG 110V
WITH
( ) -
OPTION
X3 H4/S8 H3/S7 GND
Operation with automatic control switch S8 "OFF"
– Switch generator main switch S7 "ON".
– Generator is disconnected from socket.
– Engine reaches nominal speed.
– Generator is re-connected after 4 secs.
– Power is now available until the generator main switch S7 is
turned "OFF".
Operation with automatic control switch S8 "ON"
– Switch generator main switch S7 "ON".
– Generator is disconnected from socket.
– Engine reaches nominal speed.
– Generator is re-connected after 4 secs.
– If a consumer is connected, the engine goes on for 60 secs. before
falling back to idle speed.
– Generator is in standby. As soon as any consumer is switched on,
the routine is repeated from step 2.
Fig. 3.25 Generator control box
Q1 Main circuit breaker 2-pole
Q2 Circuit breaker 2-pole
Q3 Circuit breaker 2-pole
Q4 Circuit breaker 2-pole
Before connecting an electrical device, always check the
data listed on the rating plate.
Fault situations and protective devices:
– When switching on the generator by means of the switch S7,
there is no voltage available at the sockets.
Open the hood and check if the circuit breakers are down.
If so, put them up (switch them on). If the circuit breakers are up,
it can be indicative of a serious electrical fault.
– When the electrical device is connected, the circuit breakers
switch always off. This indicates a fault in the electrical device.
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