Savin SDC103A Service Manual download pdf (Page 76)

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101

1.3.4 Drum Potential Sensor Calibration

The drum potential sensor [A] has a detector which detects the strength of

the electrical field from the electrical potential on the drum. Since the output

of the sensor is affected by environmental conditions, such as temperature

and humidity, the sensor needs to be calibrated. This is done during the

process control self check.

The high voltage supply board has two relay contacts. Usually, the relay

contact [B] grounds the drum. However, during the self check, the machine

switches the relay contact [C] to apply a voltage to the drum shaft [D]. In this

condition, the drum is isolated from the ground (floating).

The machine calibrates the sensor output by measuring the output of the

drum potential sensor when -200V and when -800V are applied to the drum.

(The relationship between potential sensor output and drum potential is

linear. So, as a result of determining the output at these two points, the

machine can determine the actual drum potential from the potential sensor

output.)

During the interval process control self check, this drum potential sensor

calibration is not performed. This is because just before the interval process

control self check, there is residual voltage on the drum and this affects the

output of the potential sensor.

[D]

[C]

[B]

[A]

Detailed

Section

Descriptions

PROCESS CONTROL

SM 2-7 A166/A187/A189

CÓPIA NÃO CONTROLADA

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Savin SDC103A Service Manual Page 76

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