NOVAR 300 Operation & Maintenance Manual NOVAR_CM
Page 26 of 29
5. SERVICING
WARNINGS
1. The circuit boards are susceptible to electrostatic discharge (ESD) and appropriate ESD
protection should be taken to avoid damage, when handling or adjusting these. The 8 kV
ESD susceptibility rating in the Technical Specification only applies with the front cover
fitted.
2. Servicing, adjustment and inspection should only be carried out by suitably qualified
personnel who are fully aware of the potentially hazardous conditions that can exist.
5.1 OUT OF SERVICE
When in storage retain the original packing, or seal the unit in a plastic bag.
The power supply circuit includes an electrolytic capacitor. During extended storage this
should be reformed every four years. Reforming is carried out as follows:
5.1.1 Connect a variable ac voltage source to the voltage supply input terminals of the
controller.
5.1.2 Set the source to zero voltage and switch on.
5.1.3 Slowly increase the voltage from zero to the rated value. Ideally the process
should extend over a period of five minutes.
5.2 IN SERVICE
Under normal operating conditions, the controller requires little attention. During routine
servicing and inspection of the associated equipment, the device should be inspected to
normal standards for this class of equipment. For example, remove dust and check all
connections for tightness after the power has been disconnected.
If a fault in the controller is suspected, it is recommended that the complete unit is replaced.
Because of the complexity of a device such as a NOVAR and the fact that it does contain
calibration variables particular to its hardware on leaving the factory, any hardware changes
subsequent to this will almost certainly lead to a loss in performance.
If it is required to attempt an investigation and/ or repair it must be noted that ESD
protection such as wrist straps must be used.
To Next Page
