MX4428 MXP Engineering / Technical Manual  Document:  LT0273 
Device Information and Programming 
Page 3-50  24 March 2006   Issue 1.5 
3.24.3  MX4428 PROGRAMMING OPTIONS - VLC800 
The only programmable items for the VLC800 are 
1.  The pre alarm threshold. 
2.  The source of the remote LED output. 
3.  The source of the onboard relay output and external relay output (they operate 
together). 
 
The VLC800 shares default values with the 814H, 814PH, and 814PHFL. However the alarm 
threshold is fixed at 100 regardless of any default setting. The default pre alarm setting of 68 
translates to 68% of the alarm value which although a suitable value, can be changed if 
required. 
 
Parameter Description  Default 
P0  Pre Alarm Threshold  68 
192 plus value below 
Value  Relay Control  Remote LED 
Control 
Resulting 
parameter 
0  Circuit Alarm  Circuit Alarm  192 
1  Circuit Alarm  Relay Logic  193 
2  Circuit Alarm  Point Alarm  194 
4  Relay Logic  Circuit Alarm  196 
5  Relay Logic  Relay Logic  197 
6  Relay Logic  Point Alarm  198 
8  Point Alarm  Circuit Alarm  200 
9  Point Alarm  Relay Logic  201 
P6 
10  Point Alarm  Point Alarm  202 
192 
 
AVF may be applied to the circuit the VLC800 point maps to.