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ALARM UNIT
It can in bright light be hard to notice when a warninglight are light on the dashboard so there have been requests to equip our machines with a central blinking light. When H9M was developed there was also a problem with fitting all the lights and buttons and there for it was natural to construct a electronic alarm unit.
The alarm unit incorperates a orange blinking 18W light on top of the dash and a alarm panel top right. The light blinks aprox. 1.4 times per/sec in case of an alarm. On the alarm panel there is room for up to 8 diods, which shows which alarm(s) that are relevant. The alarm functions, starting at the top are:
1. Charge
2. Engine oil pressure
3. Servo pressure
4. Hydrulic oil level
5. Cooling water temperature
6. Cooling water temperature (Only H25B)
7. Hydrulic oil temperature (Only H25B and H16C)
8. Reserve
Furthermore there is a test button for testing the diods. When the button is pushed all diods should be light.
The alarm panel is fastened with a screw from above and is connected with a quick connector.
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THE CHARGING CONTROLLER CIRCUIT
The charge controller works differently then the other controllers. From the D+ connector on the generator there is a wire to a integrated circuit (IC) that measures the voltage. This IC controls a transistor (T) that lights the diod och controls the engine starter relay.
If the current from the generator exceeds 23V the transistor T is blocked which means the diod is off and the engine start relay is open. If the current is below 21V T opens and the alarm lamp and diod is light and the starter relay prevents starting the engine.
The relay have an inbuilt delay of about 3 sec when the generator voltage is raising and 2 sec on falling voltage, to let the engine stop properly before you try and start it again and to allow a proper chance for it to start when a cold weather start is attempted.
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FUNCTION: (All components except the charging)
When a sensor is activated (Connected to ground) the current flows from +24V to the resistor R and through the diod and sensor to ground. Therefor the diod is light and the oscillator pulsates due to the fall of voltage on R and the warning light blinks.
Between the sensor and +24V there are only the diod and the resistor. These components pretty much never breaks. If the test button is pushed all the sensors are connected giving an indication if the diod, resistor and wiring for the warning light is in order. IF A DIOD IS LIGHT THERE IS A REAL WARNING. There is of course the possibility of a short circuit because of damage or dirt that will give a false alarm.
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1. Blinking warning light
2. Diods
3. Sensors
4. Oscilator
5. Test button.
6. Voltage meter.
7. Engine start relay.
8. Key circuit breaker.
9. Start button.
10. Connectors on engine.
11. Battery.
12. Generator.
13. Voltage regulator.
14. Starter.
15. Fuse box on engine.
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IN CASE OF PROBLEMS
When new things are introduced, and especially when it comes to electronics in excavators you can expect some technical difficulties at the start. When it comes to the alarm unit it is the voltage controller that have been troublesome. One reason for this is bad components. Furthermore there have been noted that voltage spikes can appear at for exemple from the magnet valve och these spikes can break the voltage control components. These problems have been sorted out as of new year 75/76.
If any component in the VOLTAGE CONTROLLER IS BROKEN THE STARTER RELAY WILL NOT OPEN. To be able to START you have to simultaneously PUSH THE TEST BUTTON. This must be communicated to the operator at delivery.
HOT-WIRING
There have been instances there one have attempted to by pass the starter relay which have lead to damage to the alarm unit. Because there is possible to start the machine by pressing the test button this is not needed. If hot-wiring is deemed necessery anyways connector 86 on the relay should be taken off and isolated and grounded. (Se appendix)
CHANGING THE ALARM UNIT
The key must be in the off position when the alarm unit is changed. If not you risk bumping into and short circuiting the circuits which will be destroyed immediately.
Also make sure there are no loose hanging wires under the dashboard that can touch the alarm unit.
SUMMERY
When a diod is light there is a real alarm unless the sensor is broken.
If the voltage control circuit is broken use the test button to start.
If the machines is working by the sea or in an aggressive enviroment protect the givers woth plastic or rustprotectorsolvent,
The key needs to be off when changing the unit.
Do not hot wire the engine starter relay.
Make sure no wires are loose under the dashboard.
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