3-19
3. Rotate the shaft of the Ground Fault Detection Sensitivity potentiometer (R53) fully
counterclockwise. (See Figure 9-2 on Page 9-5 for location) The potentiometer is a 12-turn
device, there will be need to rotate the shaft repeatedly. The potentiometer produces a clicking
sound when rotated beyond its end point.
4.
On the Mother Board (SCMB), place a resistor with the desired set-point value (40K Ohm to 500K
Ohm, +/- 5% Tolerance) between the +24VDC terminal on TB4 and the earth ground terminal.
See Figure 3-10 on Page 3-10.
5. 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 set-point is set correctly.
6. Disconnect the resistor used to set the sensitivity level.
7. Reconnect the wire between the earth ground terminal on the Mother Board and earth ground.
Section 3-8 - Battery Care and Backup Battery Calculations
Installation and Care of Sealed Lead Acid Batteries
Sealed lead acid batteries are designed to operate in standby service for approximately five years.
This is based upon a normal service condition where there is an ambient temperature of 20 degrees
C (68 degrees F) and batteries are completely discharged once every three months. LENGTH OF
SERVICE LIFE WILL BE DIRECTLY AFFECTED BY THE NUMBER OF DISCHARGE CYCLES,
DEPTH OF DISCHARGE, AND AMBIENT TEMPERATURE.
Use Guidelines:
Avoid installation and/or operation in close proximity to heat sources. While the operating
temperature range is 0 to 49 degrees C (32-120 degrees F), battery life will be maximized at an
ambient temperature of 20 degrees C (68 degrees F).
Batteries may generate ignitable gases. Because of this, batteries shall be installed in a well-
ventilated location, away from spark producing equipment.
Batteries shall not be installed in an atmosphere where organic solvents or adhesives may be
present. The batteries shall not be cleaned with oils, thinners, or similar substances. The
case and cover of the batteries are ABS plastic resin, which may suffer damage from these
chemicals.
Batteries shall not be installed in a heavy vibration or shock location.
Batteries shall have a minimum separation of ¼” between cells.
Insulated gloves shall always be worn when handling batteries.
WARNING: Batteries shall not be crushed, incinerated, or dismantled. The electrolyte
contains sulfuric acid, which can cause serious damage to eyes and skin. If
contact does occur, flush with water and seek immediate medical attention.
Batteries of different capacities, age, or manufacturer shall not be used together.
Battery Storage
Batteries which are to be stored for an extended period of time should be given a supplement charge
monthly. Batteries should never be stored in a discharged condition.
The self-discharge rate of batteries is approximately 3% per month when the storage temperature is
maintained at 20 degrees C (68 degrees F). The self-discharge rate will vary depending upon
temperature. Cooler temperatures cause the self-discharge rate to decrease. Warmer temperatures
cause the self-discharge rate to increase.
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