CHART TRIFECTA 2K, Service Manual

Page: 22 / 33

Trifecta 2K 18
F
USES
The control box has three fuse-holder terminal blocks, which are black and have a lift open
door. The power to the system should be turned off when checking or replacing fuses. To
replace or check a fuse, lift the door open and slide the fuse out of the holder. Slide the new
fuse in place and snap the door back into place. T
ABLE
9 lists the specifications of the fuses in
use, with F
IGURE
6 illustrating the location of the fuses.
R
ESISTOR
E
LEMENTS
The control circuit utilizes precision resistor elements to convert the transmitters’ 4-20mA
current signal to a voltage for the controller to read. The resistors are 500 Ohms and have very
tight tolerances. If a resistor does not measure 500 Ohms within 0.5 Ohms, a new resistor
should be installed. T
ABLE
10 lists the resistor information:
T
ABLE
9 - Fuses
Fuse Type Size Capacity Chart, Inc. Part Number
AGC-10 ¼” x 1” (0.7 x 2.54 cm) 10 Amperes AAA0205
AGC-5 ¼” x 1” (0.7 x 2.54 cm 5 Amperes AAA0204
114 114 114 114 114 114 114 114 114 114 114 114
SH SH SH SH SH SH SH SH SH SH SH SH
114 114 114 114 114 114 114 114 114 114 114 114
201 113 202 113 203 113 204 113 205 113 206 113
SH SH SH SH SH SH SH SH SH SH SH SH
309 310
XI N N N N N GND
CR302 CR304 CR306 CR308 CR310 CR312 CR314 CR316
FU104 FU112 FU120
103 104 105 106 108 109 110 111
102 102 102 102 107 107 107 107
201 113 202 113 203 113 204 113 205 113 206 113
113 113 113 113 113 113 113 113
301 302 303 304 305 306 307 308
F
IGURE
6 - Fuse Location Diagram
Tank #1 Solenoid Valves (10A)
Tank #2 Solenoid Valves (10A)
Enclosure Heater (5A)
Fuse Holders (3)
Resistance Value Tolerance Chart, Inc. Part Number
500 Ohm 0.1% 10965691
T
ABLE
10 - Resistor Elements