BATTERY CHARGER USER’S MANUAL                                                                                   PART- 2: THEORY OF OPERATION 
 
MCEnPC23-REV.2.4      Page 53 
 
iv.  Negative Ground Fault Alarm 
 
If resistance between negative to chassis decreases below a preset value during a preset time, this alarm will be 
activated. Leakage resistance is given by the following formula: 
Leak
Leak
I
R
2
1
 
Example:
mAI
Leak
5
,  
VR
leak
/100 
 
 
We can enable or disable and adjust Negative Ground Fault alarm as shown on the procedure below: 
 
Alarms?
Ok
Next Pr
Exit
Adjust? Level1
Ok
Next Pr
Exit
ON5.0mA      GNDF
Set
ExitNext
Pr
ON
OFF
Next
Exit
:getyou  Next till Press
Next
Exit
-
ON  GNDF
Fault  Ground
10.5A   136.2V
:getyou  Next till Press
ON5.0mA  GNDF
 
 
Figure 53 : Negative Ground Fault Alarm adjustments procedure.