Control Modules
Turn controller power off before servicing controls. This ensures safety and prevents damage to controller.
PROCESSOR MODULE (PSIO), 4 IN/4 OUT MODULE (SIO),
RED LED Ð Blinking continuously at a 3- to
GREEN LED Ð On a PSIO and an SIO, this is the green LED closest to COMM connectors. The other green LED on module indicates external communications, when used. Green LED should always be blinking when power is on. It indi- cates modules are communicating properly. If green LED is not blinking, check red LED. If red LED is normal, check module address switches. See Fig. 18. Proper addresses are:
PSIO | (Processor Module) Ð 01 (different when CCN |
| connected) |
DSIO | (Relay Module) Ð 19 |
DSIO | (EXV Driver Module) Ð 31 |
SIO | (4 In/4 Out Module) Ð 59 |
If all modules indicate communication failure, check COMM plug on PSIO module for proper seating. If a good connec- tion is assured and condition persists, replace PSIO module.
If only DSIO or SIO module indicates communication fail- ure, check COMM plug on that mode for proper seating. If a good connection is assured and condition persists, replace DSIO or SIO module.
All system operating intelligence rests in PSIO module, the module that controls unit. This module monitors condi- tions through input and output ports and through DSIO mod- ules
The machine operator communicates with microproces- sor through keypad and display module. Communication be- tween PSIO and other modules is accomplished by a
On sensor bus terminal strips, terminal 1 of PSIO module is connected to terminal 1 of each of the other modules. Terminals 2 and 3 are connected in the same manner. See Fig. 19. If a terminal 2 wire is connected to terminal 1, sys- tem does not work.
In Flotronic™ II chillers, processor module,
Fig. 18 Ð Module Address Selector Switch Locations
63