Carrier 17EX Control Modules, Module Address, Input Options Module, Module Switch, Open

Control Modules

Turn the controller power off before servicing the con- trols. This ensures safety and prevents damage to the controller.

The Processor/Sensor Input/Output module (PSIO), 8-input (Options) modules, Starter Management Module (SMM), 4-in/2-out module, and the Local Interface Device (LID) mod- ule perform continuous diagnostic evaluations of the hard- ware to determine its condition. Proper operation of all modules is indicated by LEDs (light-emitting diodes) located on the side of the LID (Fig. 49); on the top horizontal surface of the PSIO (Fig. 50), SMM, and 8-input modules; and on the 4-in/ 2-out module.

NOTE: Address switches on this module can be at any position. Ad- dresses are only changed through the LID screen for CCN.

Fig. 49 Ð LID Module (Rear View) and

LED Locations

Fig. 50 Ð PSIO Module LED Locations

RED LEDs

PSIO Module Ð If the LED is blinking continuously at a 2-second rate, it is indicating proper operation. If it is lit con- tinuously it indicates a problem requiring replacement of the module. Off continuously indicates that the power should be checked. If the red LED blinks 3 times per second, a soft- ware error has been discovered and the module must be re- placed. If there is no input power, check the fuses and the circuit breaker. If the fuses are good, check for a shorted secondary of transformer, or if power is present to the mod- ule, replace the module.

4-In/2-Out Module Ð If the LED is blinking, this module is operating properly. A steady red light indicates a module fail- ure. Replace the 4-In/2-Out module.

GREEN LEDs Ð There are 1 or 2 green LEDs on each type of module. These LEDs indicate communication status be- tween different parts of the controller and the network mod- ules as follows:

LID Module

Upper LED Ð Communication with CCN network, if present; blinks when communication occurs.

Lower LED Ð Communication with PSIO module; must blink every 5 to 8 seconds when the LID default screen is displayed.

PSIO Module

Green LED Closest to Communications Connection Ð Com- munication with SMM and 8-input module; must blink continuously.

Other Green LED Ð Communication with LID; must blink every 3 to 5 seconds.

8-Input Modules and SMM Ð Communication with PSIO module; blinks continuously.

4-In/2-Out Module Ð Communication with PSIO module; blinks continuously.

Notes on Module Operation

1.The chiller operator monitors and modi®es con®gura- tions in the microprocessor through the 4 softkeys and the LID. Communication with the LID and the PSIO is accomplished through the CCN bus (COMM1). The com- munication between the PSIO, SMM, both 8-input mod- ules, and the 4-in/2-out module is accomplished through the sensor bus (COMM3), which is a 3-wire cable. On the sensor bus terminal strips, Terminal 1 of the PSIO module is connected to Terminal 1 of each of the other modules. Terminals 2 and 3 are connected in the same manner, except for the connection to the 4-in/2-out mod- ule. See Fig. 51.

2.If a green LED is on continuously, check the communi- cation wiring. If a green LED is off, check the red LED operation. If the red LED is normal, check the module address switches (Fig. 52-54). Proper addresses are set as shown below:

MODULE	ADDRESS
	S1	S2
SMM (Starter Management Module)	3	2
8-input Options Module 1	6	4
8-input Options Module 2	7	2

MODULE				SWITCH
	1	2	3	4	5	6	7	8
4-In/2-Out Module	O	O	O	O	C	O	C	O

O Ð Open

C Ð Closed

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