88
AGR 070A through 100A
IOMM AGR-1
Figure 38, MCB Power Supply Terminals
POWER FUSES
[BUSSMAN GDC-T2A]
PO
W
E
R
IN
[18-24 V
C
T]
AC AC G
ND G
N
D
AUX
/
OUT
4
3
2
1
9
8 7
6
5
4 3
2
1
Fuse F1
Fuse F2
Troubleshooting the Keypad/Display Interface
The Keypad/Display Interface is connected to the MCB via a ribbon cable and discrete wiring for the
backlight. The MCB provides operating voltages, control signal outputs for the display, and input
conditioning for the keypad inputs.
Display is Hard to Read
The clarity of the LCD display can be affected by ambient temperature. Typically, less contrast will
result with cooler temperatures. If the display is difficult to read, adjust the contrast trim pot, which is
located on the back of the keypad/display assembly.
Display is Blank or Garbled
If the MCB appears to be functioning properly and the display is completely blank or garbled,
perform the following procedure:
1.
Try cycling power to the controller by opening and then closing circuit breaker CB1 (see note
below).
2.
Try adjusting the contrast trim pot, which is located on the back of the keypad/display assembly.
If the contrast trim pot has no effect, it is likely that either the keypad/display or its ribbon cable
is defective.
3.
After removing power from the controller, check the ribbon cable and connections between the
keypad/display and the MCB. Look for bent pins. Restore power after reconnecting the ribbon
cable.
4.
Try swapping a known good ribbon cable and keypad/display. Swap these components
separately to isolate the problem. Remove power from the controller before disconnecting the
suspect component, and restore power after connecting the replacement component. If the
problem persists, it is likely that the MCB is defective.
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...
