E05: Board Overtemperature - Graco REACTOR E-20 Repair Manual

a. Remove plug J1 (Green 14-pin terminal block)
from the temperature control board and make
sure all pins are securely connected.
2. Check the "A" and "B" thermocouples by removing
the J1 connector from the temperature control board
and check the pins with an ohmmeter.
a. "A" thermocouple:
• With J1 disconnected measure the resistance
across pins 7 and 8. It should measure 4 - 6
Ohms. If not, replace the "A" thermocouple.
• Measure the resistance between Pin 7 and the
thermocouple housing. Measure the resistance
between Pin 8 and the thermocouple housing. It
should be infinity, if not replace the "A" thermo-
couple.
b. "B" thermocouple:
• With J1 disconnected measure the resistance
across pins 10 and 11. It should measure 4 - 6
Ohms. If not, Replace the "B" thermocouple.
• Measure the resistance between Pin 10 and the
thermocouple housing. Then measure between
Pin 11 and the thermocouple housing. It should
read infinity. If not replace the "B" thermocouple.
FTS:
1. Check FTS operation by connecting directly to
Reactor.
a. Locate the FTS.
b. Unplug the FTS electrical connection.
c. Plug the Reactor end of the connector directly
into the FTS electrical connector.
14
Temperature Control Diagnostic Codes
2. Check cable connections between all hose lengths.
3. Check temperature sensor connection at J1 on tem-
perature control board, page 38. Ensure pins 12, 13
and 14 are connected properly.
4. Check the FTS with an ohmmeter, page 44.
5. Use manual current control mode; see operation
manual.
6. Check FTS operation by connecting directly to
Reactor.
7. Check cable connections between all hose lengths.
8. Check temperature sensor connection at J1 on tem-
perature control board, page 38.
9. Check thermocouple, page 41. Check FTS, page
44.
10. Use manual current control mode; see operation
manual.

E05: Board overtemperature

The circuit board has it's own temp sensor. If it sees the
circuit board getting too hot (80°C for >42ms/50ms), it
will shut down.
1. Check fan operation.
2. Check electrical cabinet door is properly installed.
3. Check for obstructions blocking cooling holes in bot-
tom of Reactor.
4. Ambient temperature too high. Reduce gun mix
chamber size, or move Reactor to a cooler location.
309574L