Doosan V158TI Operation & Maintenance Manual page 252

2. System checks and measures
For initial installation, it is recommended for you to check any disconnection in circuits before taking mea-
sures described here (see Chapter 2. Installation for how to install the controller).
You can check the controller for failure diagnosis in accordance with the following procedure.
Step 1) Check the battery voltage whether it is higher than the Low Voltage setting value.
If normal, supply power to the controller and then operate it. If the voltage is lower than the set-
ting value, you need to charge the battery or replace it before operating the system.
Step 2) Check the input resistance in the DC +24V input terminals (-E, +F) of the battery whether the
resistance is higher than approx. 10K Ohm. If the resistance does not meet this condition, do not
supply power to the controller and contact our A/S center for service request.
Step 3) Check whether the power LED turns on or not after supplying power to DC +24V input terminals
(-E, +F) of the battery. If the LED does not turn on, cut the power off and contact our A/S center
for service request.
Step 4) Check whether the power LED turns on and Doosan logo appears on the LCD display after sup-
plying power to DC +24V input terminals (-E, +F) of the battery.
If you cannot see the logo, press LCD key button to check the LCD display once again.
If you cannot still see the logo, cut the power off and contact our A/S center for service request.
Step 5) Check the controller terminals (C & D) with AC meter or oscilloscope to check whether signal
inputs of AC RMS 3V or higher are detected. If no signal detected, check whether the pick-up
sensor maintains the gap between 0.9 and 1.1 mm and then check whether the pick-up sensor
has resistance of 110 Ohms (±10%). If you cannot still detect no signal, replace the pick-up sensor
and then operate the controller.
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