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4.2
4.3
Mains voltages exist within the power supply unit
4.4
Issue: A
Revision: 1
Date: 24/07/19
Safety Considerations
The mains power is supplied to the whole system via the power supply unit. If
any servicing or re-wiring is to be performed ensure that the power supply is
isolated. For commissioning, the system needs power, compressed air to the air
purges and the isolating valves (if used) to be open.
Power
Supply
Selection
DANGER!!!
With the mains supply switched OFF, unscrew the four captive screws on the lid
of the power supply and remove the lid. Select the correct supply voltage using
the sliding switch.
Turning the Power ON
Once the supply voltage switch has been correctly set, switch the power ON.
Check that the power supply rail indication LED illuminates and that the LCD
display is functioning at the signal processor. Replace the lid of the power
supply.
After the initial power on and while the heated source is reaching temperature,
the display will show WAITING FOR REFERENCE. When the source has reached
an adequate temperature for the reference to be detected, the message
STABILISING REF will be displayed, along with the frequency and mark/space
ratio - see diagnostic mode for details.
The reference frequency will take some time to stabilise (about 5 minutes from
cold start up).
When it has been within tolerance for 10 consecutive
measurement cycles, the instrument will automatically change to the operating
mode - this is Mode 1 and is indicated by a number 1 appearing in the top left
hand corner of the LCD. The display will show a reading in ppm - this is not
accurate until commissioning has been completed.
Ref: 100606
Section 4
Commissioning
Voltage
Page: 43
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