SAFEPATH Manual
Sheet 45 of 78
Rev. C April 1999
Ground Fault Detection Sensitivity Adjustment
The resistance at which a ground fault condition will be indicated is adjustable. The ground fault detection sensitivity can be
adjusted between 40K and 500K Ohms. Selecting a high sensitivity (high resistance) will have a fast response to ground fault
conditions, but may also cause a high number of false trouble conditions. Selecting a low sensitivity (low resistance) will greatly
reduce the susceptibility to false trouble conditions, but will slow the response to ground fault conditions.
Before the following adjustment procedure is performed, all trouble conditions must be corrected (cleared) and the "GROUND
FAULT ENABLE ("EN")/DISABLE ("DIS") jumper placed in the enable position.
NOTE
: The ground fault detection sensitivity setpoint must be approved by the authorities having jurisdiction.
Adjustment Procedure
1.
Disconnect the wire between the earth ground terminal on the digital voice module (see Figure 5 for DX-100 or Figure 6 for DX-
200) and earth ground.
2. Rotate the shaft of the Ground Fault Detection Sensitivity potentiometer (R517 on DX-100 or R123 on DX-200) fully counter
clockwise (see Figure 5 for DX-100 or Figure 6 for DX-200). The potentiometer is a twelve turn device, so the shaft will
probably have to be rotated a number of times. The potentiometer will make a clicking sound when it is rotated past its end
point.
3. Place a resistor with the desired setpoint value between the positive side of the input voltage of the digital voice module and
the earth ground terminal on the printed circuit board.
4. Slowly rotate the shaft of the Ground Fault Detection Sensitivity potentiometer clockwise. When a ground fault is indicated by
the trouble LED's, the sensitivity setpoint is set correctly.
5.
Disconnect the resistor used to set the sensitivity level.
6.
Reconnect the wire between the earth ground terminal on the printed circuit board and earth ground.
Содержание SAFEPATH SAPE-1AB
Страница 10: ...SAFEPATH Manual Sheet 11 of 78 Rev C April 1999 Figure 1 Basic Capabilities of the SAFEPATH Panel...
Страница 19: ...SAFEPATH Manual Sheet 20 of 78 Rev C April 1999 Figure 3 Operator s Console...
Страница 24: ...SAFEPATH Manual Sheet 25 of 78 Rev C April 1999 Figure 5 DX 100 Module Illustration...
Страница 25: ...SAFEPATH Manual Sheet 26 of 78 Rev C April 1999 Figure 6 DX 200 Module Illustration...
Страница 28: ...SAFEPATH Manual Sheet 29 of 78 Rev C April 1999 Figure 7 SAFEPATH Panel Mounting...
Страница 32: ...SAFEPATH Manual Sheet 33 of 78 Rev C April 1999 Figure 8 Typical System Block Diagram...
Страница 62: ...SAFEPATH Manual Sheet 63 of 78 Rev C April 1999 Figure 30 Module Layout of the SAFEPATH Panel...
Страница 63: ...SAFEPATH Manual Sheet 64 of 78 Rev C April 1999 Figure 31 SAFEPATH Panel Block Diagram...
Страница 66: ...SAFEPATH Manual Sheet 67 of 78 Rev C April 1999 Figure 33 Supervised Audio System Common Control Module...
Страница 70: ...SAFEPATH Manual Sheet 71 of 78 Rev C April 1999 Figure 35 Self Amplified Speaker Control Signal Circuit Module...
