Carrier 19XL specifications Control Modules, Module Address, Input Options Module

Control Modules

Turn controller power off before servicing controls. This ensures safety and prevents damage to controller.

The Processor module (PSIO), 8-input (Options) mod- ules, Starter Management Module (SMM), and the Local Interface Device (LID) module perform continuous di- agnostic evaluations of the hardware to determine its con- dition. See Fig. 39-43. Proper operation of all modules is indicated by LEDs (light-emitting diodes) located on the side of the LID, and on the top horizontal surface of the PSIO, SMM, and 8-input modules.

RED LED Ð If the LED is blinking continuously at a 2-second rate, it is indicating proper operation. If it is lit continuously 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 sec- ond, a software error has been discovered and the module must be replaced. If there is no input power, check fuses and the circuit breaker. If fuse is good, check for shorted sec- ondary of transformer, or if power is present to the module, replace the module.

GREEN LEDs Ð There are one or 2 green LEDs on each type of module. These LEDs indicate communication status between 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

Green LED Ð Communication with PSIO module; will blink 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. The communication between the PSIO, SMM, and both 8-input modules is accomplished through the sensor bus, which is a 3-wire cable.

On sensor bus terminal strips, Terminal 1 of PSIO mod- ule is connected to Terminal 1 of each of the other modules. Terminals 2 and 3 are connected in the same manner. See Fig. 39-43. If a Terminal 2 wire is connected to Terminal 1, the system does not work.

2.If a green LED is solid on, check communication wiring. If a green LED is off, check the red LED operation. If the

red LED is normal, check the module address switches (Fig. 39-43). Proper addresses are:

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

If all modules indicate communications failure, check com- munications plug on the PSIO module for proper seating. Also check the wiring (CCN bus Ð 1:red, 2:wht, 3:blk; Sensor bus Ð 1:red, 2:blk, 3:clr/wht). If a good connec- tion is assured and the condition persists, replace the PSIO module.

If only one 8-input module or SMM indicates commu- nication failure, check the communications plug on that module. If a good connection is assured and the condi- tion persists, replace the module.

All system operating intelligence rests in the PSIO mod- ule. Some safety shutdown logic resides in the SMM in case communications are lost between the 2 modules. The PSIO monitors conditions using input ports on the PSIO, the SMM, and the 8-input modules. Outputs are con- trolled by the PSIO and SMM as well.

3.Power is supplied to modules within the control panel via 21-vac power sources.

The transformers are located within the power panel, with the exception of the SMM, which operates from a 24-vac power source and has its own 24-vac transformer located within the starter.

Within the power panel, T1 supplies power to the LID, the PSIO, and the 5-vac power supply for the transduc- ers. The other 21-vac transformer is T4, which supplies power to both 8-input modules (if present). T4 is capable of supplying power to two modules; if additional mod- ules are added, another power supply will be required.

Power is connected to Terminals 1 and 2 of the power input connection on each module.

Fig. 39 Ð PSIO Module Address Selector Switch

Locations and LED Locations

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