IOMM AGR-1
AGR 070A through 100A
83
Trouble Analysis for the AGR MicroTech Controller
Microprocessor Control Board
The Microprocessor Control Board (MCB) is shown in Figure 36. It contains a microprocessor that is
preprogrammed with the software required to monitor and control the chiller. The various MCB
connections and components are described below.
Figure 36, Microprocessor Control Board (MCB)
RUNNING
RESET
ACTIVE
OUTPUT 0
CPU
STATUS
POWER FUSES
[BUSSMAN GDC-T2A]
PO
W
E
R
IN
[18-
24 V
C
T
]
AC
AC
G
N
D
G
N
D
AUX
/
OUT
DIGITAL OUTPUTS
ANAL
O
G
I
N
P
U
T
S
D
IG
ITA
L I
N
P
U
TS
HI
ADDRESS
LO
K
EYPA
D
/
L
CD DI
S
P
L
AY
COMMUNICATIONS
PORT A
PORT B
[FUSE: BUSSMAN MCR-1/4]
FUSE 1
2
3
4
Hex switches
Microprocessor status LED's
EXPANSION BUS
Digital Inputs Connection
The MCB receives digital inputs from the Analog Digital Input (ADI) board through the Digital
Inputs connector via a plug-in ribbon cable. The ADI board conditions these inputs.
Analog Inputs Connection
The MCB receives conditioned analog inputs from the ADI board through the Analog Inputs
connector via a plug-in ribbon cable. The ADI board conditions these inputs. After having been
conditioned, all analog inputs enter the MCB through the Analog Inputs port as 0–5 Vdc signals.
Digital Outputs Connection
After processing all input conditions, the MCB sends the appropriate output signals to output devices
through the Digital Outputs port via a plug-in ribbon cable.
Power In Connector
The MCB receives 18 Vac, center-tapped power from transformer T4 through the Power In connector.
This power drives all logic and communications circuitry.
Power Fuses
Two identical 2-amp fuses are located to the right of the Power In connector. These fuses are in the
MCB power supply circuit.
Microprocessor Status LEDs
The green, red, and amber LEDs on the MCB provide information about the operating status of the
microprocessor. The amber LED also indicates the existence of alarm conditions.
Following is the normal start-up sequence that the three status LED’s should follow when power is
applied to the MCB:
Содержание AGR 070AS
Страница 20: ...20 AGR 070A through 100A IOMM AGR 1 Figure 9 Typical Field Wiring with Global UNT Controller...
Страница 21: ...IOMM AGR 1 AGR 070A through 100A 21 Figure 10 Typical Field Wiring Diagram with MicroTech Controller...
Страница 22: ...22 AGR 070A through 100A IOMM AGR 1 Figure 11 Standard Single Point Connection with FanTrol...
Страница 23: ...IOMM AGR 1 AGR 070A through 100A 23 Figure 12 Standard Single Point Connection with Optional SpeedTrol...
Страница 24: ...24 AGR 070A through 100A IOMM AGR 1 Figure 13 Unit Control Schematic 2 compressor UNT...
Страница 25: ...IOMM AGR 1 AGR 070A through 100A 25 Figure 14 Staging Schematic 2 compressor 4 stage UNT...
Страница 26: ...26 AGR 070A through 100A IOMM AGR 1 Figure 15 Staging Schematic 2 compressor 6 stage UNT...
Страница 27: ...IOMM AGR 1 AGR 070A through 100A 27 Figure 16 MicroTech Controller Schematic...
Страница 28: ...28 AGR 070A through 100A IOMM AGR 1 Figure 17 Unit Control Schematic MicroTech...
Страница 29: ...IOMM AGR 1 AGR 070A through 100A 29 Figure 18 Staging Schematic 4 stage MicroTech...
Страница 30: ...30 AGR 070A through 100A IOMM AGR 1 Figure 19 Staging Schematic 6 stage MicroTech...
Страница 31: ...IOMM AGR 1 AGR 070A through 100A 31 Figure 20 Unit Control Schematic 2 compressor MicroTech...
Страница 32: ...32 AGR 070A through 100A IOMM AGR 1 Figure 21 UNT Instrument Layout See legend on page 34...
Страница 33: ...IOMM AGR 1 AGR 070A through 100A 33 Figure 22 MicroTech Instrument Layout See legend on page 34...
Страница 35: ...IOMM AGR 1 AGR 070A through 100A 35 Figure 25 MicroTech Sensor Layout...
Страница 99: ...IOMM AGR 1 AGR 070A through 100A 99 Notes...
Страница 100: ...Post Office Box 2510 Staunton Virginia 24402 USA 800 432 1342 www mcquay com...
