4.1.2 Wiring diagram for recorder
Check for proper Earthing
Proper Earthing is necessary for best performance of the Recorder. Follow the steps mentioned below
to check whether the Earthing given to the recorder is proper or not:
▪ Find out the Phase line of connection with the help of “Tester with Neon Lamp". When Neon
Lamp glows, it is an indication of the phase line.
▪ Once Phase is found, the other hole which is in line of phase is the Neutral line.
▪ The third hole which is apparently bigger in diameter is the Earthing line.
▪ Now take the voltmeter with appropriate measurement range (normally 75OVAC or higher)
and put the probes into PHASE and NEUTRAL line and take reading.
▪ The voltage across PHASE and EARTH, and NEUTRAL and EARTH.
▪ The voltage between Neutral and Earth Should not be more than 6V. If by any chance it is
more than 30V, it is a serious fault on earth line and must immediately be corrected.
Proper Earthing is essential for safety of the personnel and for the proper functioning of the
equipment.
Note: If connecting the instrument in the panel, panel and recorder both should be at the same
Earthing potential.
Wiring diagram for 11" recorder:
Loosen the captive screws on the chart plate fully. Open the chart plate. It will open more than 160
deg. Ensure that the pen assembly is not damaged. You will find two PCBs in the recorder. One PCB
(power supply) is fitted at the bottom of the box as indicated and another (sensor PCB) is fitted on the
chart plate as shown in Figure 6. Refer to the following drawings to connect mains, battery and sensor
to the recorder. If IP protection is opting for, please ensure that all the cables are passed through the
glands and glands are tightened fully after completing the wiring.
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