Sentry Industries Sentry Xpress 4.0 - Manual (Page 13)

13
Trouble Shooter
Problem: Controller display is
blank. No heat in kiln.
■ Is the kiln connected to the power?
■ Has the circuit breaker tripped or fuse blown?
■ Is power reaching the wall receptacle?
Test with a voltmeter or a test light if you are not sure.
■ Has the kiln switch box
½ amp fuse blown?
The kiln’s ½ amp fuse is
located in the kiln switch
box. Remove by pressing
the fuse holder and turning
counter-clockwise half a
turn. Check the fuse by
placing the probes of an
ohmmeter on the ends
of the fuse. If the ohm-
meter reads less than
an ohm (digital meter)
or reads 0 ohms (ana-
log meter), the fuse is
okay. If the reading is
OPEN (digital meter)
or infinity/no needle
movement (analog me-
ter), the fuse is bad.
Replacement fuse:
AGC 1/2 A 250V AC
■ Is the controller receiving power? Test the power IN-
PUT connections on the back of the controller with a
voltmeter.
Controller Power Input Test
Unplug the kiln. Remove the 4 screws holding the con-
troller faceplate to the switch box. Lift faceplate out of box
and let the board hang on the box with the back of the board
facing you. Plug the kiln back in. Touch voltmeter probes
Touch the voltmeter probes to the white and orange wires to test voltage
going to the controller. The voltmeter must be in AC mode.
Selecting °F or
°C Display
The controller can display temperature in either °F or
°C. If your controller shows a small display dot in the lower
right corner of the display, the temperature shown is °C. No
dot means °F. To change temperature display:
UNPLUG kiln or disconnect power.
Remove the four screws that hold the controller to
the front of the kiln. Carefully remove the controller
from the kiln. Leave the wires attached to the con-
troller.
Look at the back of the controller. You will find a set
of connector pins near the bottom labeled “C/F.”
When a jumper is placed on the C/F pins, the display
reads °F. When the jumper is removed, displayreads
°C. Remove or insert the jumper as desired. (You
can purchase the jumper from a computer supply
store if necessary.)
Install the controller being careful not to jar compo-
nents on the back of the controller against the kiln
case.
The C/F jumper terminal is on the back of the controller, circled above.