Thermo Technologies USDT 3000 - Manual (Page 10)

9
ROUBLESHOOTING
Problem: Nothing happens when unit is powered-up.
Cause/Remedy: The fuse could be blown – check and replace if necessary. If the fuse blows
again, then the pump draws more current than the unit is design to supply. Use an auxiliary relay
or contact your product supplier.
Problem: Operating control red lamp is flashing.
Cause/Remedy: This indicates a system alarm warning, which may be caused by a sensor fault:
•
Error code –888.8 is displayed è (TC, TS or TT) sensor cable is short circuited
•
Error code 888.8 is displayed è (TC, TS or TT) sensor cable is open
Following table shows the impedance characteristics of PT 1000 sensors:
o
C - 10 0 10 20 30 40 50 60 70 80 90 100 110
o
F 14 32 50 68 86 104 122 140 158 176 194 212 230
OHM 961 1000 1039 1078 1117 1155 1194 1232 1271 1309 1347 1385 1423
PECIFICATION
Supply Voltage
120 V AC
Fuse 4 A
Phantom Load max. 2 W
Hysteresis 6 degrees
Delta T 4 – 24
o
F
Overheating Range 100 – 200
o
F
T
S