Product Manuals/Man-1088_Sigma XT_26 Page 17 of 40
For 3 or more actuators
Rotate the extinguishant adjust control until the Fault lamp lights. By rotating the extinguishant
adjust control back and forth the Fault lamp can be toggled on and off, this is usually between ¼
and ½ a turn. Establish these points and leave the extinguishant adjust control set with the Fault
lamp just off.
Check the Fault lamp lights when shorting the extinguishant output end of line device and the
lamp goes out when the short is removed. Repeat several times to check for reliable operation. If
the fault lamp is delayed going off or doesn’t go off, then slightly adjust VR2 clockwise and repeat
this paragraph
If nuisance tripping occurs then adjust the extinguishant adjust control clockwise in steps of 5
minutes (as per a clock face) until the nuisance tripping stops. Be sure to check after each
adjustment that shorting the extinguishant end of line device will illuminate the Fault lamp and
removing the short extinguishes the Fault lamp
For 1 or 2 actuators
Values between 2 ohms and 5 ohms can be detected and a fault level set but the adjustment is
very fine and may be difficult to set, the lower the value, the finer the adjustment.
Rotate the extinguishant adjust control until the fault lamp lights. By rotating the extinguishant
adjust control until back and forth, the fault lamp can be toggled on and off, this is usually about ½
a turn of the extinguishant adjust control until. Establish these points and leave the extinguishant
adjust control until set with the Fault lamp just off.
Short circuit the Extinguishant end of line device and wait for up to 20 seconds for the
Fault lamp to light, if it doesn’t, remove the short and tweak the extinguishant adjust control until
anticlockwise about 2 minutes (as per a clock face) or less and then reapply the short. Keep doing
this until the fault lamp lights. Once it lights, check that removing the short
Extinguishes the Fault lamp, if it doesn’t, turn the extinguishant adjust control slightly clockwise.
Apply the short several times and make sure the fault lamp lights each time reliably, if it doesn’t
repeat the above paragraph until it does.
Figure 13. Extinguishant adjust control and Exting fault LED
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