Control Modules; Notes On Module Operation; Processor Module (Psio); Inputs - Carrier 17 Start Up & Operation Manual

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 In-
terface Device (LID) module perform continuous diagnostic
evaluations of the hardware to determine its condition. 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 — 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 second, 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 secondary of transformer,
or if power is present to the module, replace the module.
GREEN LEDs — 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 — Communication with CCN network, if present;
blinks when communication occurs.
Lower LED — 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 — Com-
munication with SMM and 8-input module; must blink
continuously.
Other Green LED — Communication with LID; must blink
every 3 to 5 seconds.
8-Input Modules and SMM
Green LED — Communication with PSIO module; will blink
continuously.

Notes on Module Operation

1. The machine operator monitors and modifies configura-
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 mod-
ules. Terminals 2 and 3 are connected in the same man-
ner. See Fig. 49-53. 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. 49-53). Proper addresses are:
MODULE
SMM (Starter Management Module)
8-input Options Module 1
8-input Options Module 2
3. Power is supplied to modules within the control panel via
Processor Module (PSIO) (Fig. 51)
INPUTS — Each input channel has 3 terminals; only 2 of
the terminals are used. Application of machine determines
which terminals are normally used. Always refer to indi-
vidual unit wiring for terminal numbers.
OUTPUTS — Output is 20 vdc. There are 3 terminals per
output, only 2 of which are used, depending on the appli-
cation. Refer to the unit wiring diagram.
ADDRESS
SW1 SW2
3 2
6 4
7 2
95
If all modules indicate communications failure, check com-
munications plug on the PSIO module for proper seating.
Also check the wiring (CCN bus — 1:red, 2:wht, 3:blk;
Sensor bus — 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.
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. 49 — PSIO Module LED Locations