Hach CD500 Bedienungsanleitung Seite 20

the USB drive is connected, the controller shows all of the available software updates. Select an
update and then push "Install". The controller starts the update procedure.
Maintenance
Service mode
Enable Service mode before maintenance tasks and inspections are done. When the Service mode
is enabled, the relay valve and buzzer are deactivated, cleaning stops and measurements data is not
saved.
Enable Service mode before the connections, sensors, cables or the compressed air system are
examined.
1. Select Options in the main menu then push Service mode.
Note: The controller automatically disables Service mode after 1 hour.
2. To examine the analog outputs, select Analog Outputs and set a fixed output current on one of
the outputs. The value can be directly measured at the related analog output.
Note: The fixed output current is deactivated when the user exits Service mode.
Cleaning the controller
Always remove power from the controller before performing maintenance activities.
Note: Never use flammable or corrosive solvents to clean any part of the controller. Use of these solvents may
degrade the environmental protection of the unit and may void the warranty.
1. Make sure the controller cover is securely closed.
2. Wipe the controller exterior with a cloth dampened with water, or with a mixture of water and mild
detergent.
Fuse replacement
The fuse is a not a user-serviceable item. Contact technical support. A blown fuse can be an
indication that the instrument has a problem and that service is necessary.
Troubleshooting
Problem
The display and Power is not supplied to the
the indicator lights controller or there is a blown
are all off fuse.
The controller The operating system does not
does not operate operate correctly.
correctly.
20 English
D A N G E R
Possible cause
Make sure that there is power to the controller. If there is
power, remove power to the controller and identify if there
is a blown fuse. If a blown fuse is found, contact technical
support.
• Restore a recovery point or the factory defaults. Select
Data>Recovery point.
• Examine the controller for damage. Set the controller to
off and then to on again. If damage is found or the
problem continues, contact technical support.
Solution