Adjusting Ground Detection Sensitivity - HindlePower AT30 SERIES Operating And Service Instructions

OPERATING THE AT30

Adjusting Ground Detection Sensitivity

The AT30 ground detection alarm sensitivity
is adjustable from 5 to 30 k
a "test resistor" whose Ohmic value is the
required ground sensitivity, and a small
jeweler's screwdriver for adjustment.
The ground detection sensitivity is adjusted
equally (+/-) from 5 to 10 k
equally from 10 to 30 k
made via potentiometer labeled RA3 SENS,
located on the Main Control PC Board (A1),
as shown in the figure at the right.
Do not try to adjust the upper potentiometer labeled RA2
BALANCE. This adjustment is made at the factory for proper
circuit operation.
Before connecting or disconnecting a test resistor, de-energize
and lock out all ac and dc voltage sources to the AT30.
Check with a voltmeter before proceeding. Restart the AT30
only when necessary to make the sensitivity adjustment. If your
battery is grounded, do not attempt this procedure.
Refer to the image at the right, and the
internal component layout drawings in
Appendix C for specific I/O panel
configurations and terminal specs.
Connect the test resistor between TB1(+)
and ground. Adjust RA3 counter-
clockwise until the front panel indicator
goes out, then adjust clockwise until the
POS GND indicator just lights. Make
this adjustment slowly, for the indicator is
only updated once every four seconds.
De-energize and lock out power to the AT30. Remove the test resistor
and verify the POS GND indicator goes out. Connect the test resistor
between TB1(-) and ground. Verify that the NEG GND indicator lights.
If not, adjust RA3 clockwise until it just does.
Remove the test resistor and return the AT30 to normal operation.
34
Ω
. You must have
Ω
, but slightly less
Ω
. Adjustments are
NOTICE
!
CAUTION
DC
OUTPUT
GND