Carrier WEATHERMAKER 48/50AJ Operation And Service Manual page 122

POINT
POINT DESCRIPTION
NAME
INPUTS
SFS Supply Fan Status switch
DMD_SW1 Demand Limit - SW1
DMD_SW2/ Demand Limit - SW2/
DHD ISCIN Dehumidification Switch Input
PRES Pressurization
EVAC Evacuation
PURG Purge
IAQIN Indoor Air Quality Switch
DMDLMTMA 4-20mA Demand Limit
EDTRESMA 4-20mA Evaporator Discharge SP Reset
OAQ Outside Air CO
SPRESET SP Reset milliamps
CEM_10K1/ CEM AN1 10k temp J5,1-2/
CEM_4201 CEM AN1 4-20 ma J5,1-2
CEM_10K2/ CEM AN2 10k temp J5,3-4/
CEM_4202 CEM AN2 4-20 ma J5,3-4
CEM_10K3/ CEM AN3 10k temp J5,5-6/
CEM_4203 CEM AN3 4-20 ma J5,5-6
CEM_10K4/ CEM AN4 10k temp J5,7-8/
CEM_4204 CEM AN4 4-20 ma J5,7-8
Table 120 — IGC Board Inputs and Outputs
POINT NAME POINT DESCRIPTION
INPUTS
RT 24 Volt Power Supply
W Heat Demand
G Fan
LS Limit Switch
RS Rollout Switch
SS Hall Effect Sensor
CS Centrifugal Switch (Not Used)
FS Flame Sense
OUTPUTS
CM Induced Draft Motor
IFO Indoor Fan
R 24 Volt Power Output (Not Used)
SPARK Sparker
LED Display LED
SCROLLING MARQUEE — This device is the keypad in-
terface used to access the control information, read sensor
values, and test the unit. The scrolling marquee display is a
4-key, 4-character, 16-segment LED display as well as an
Alarm Status LED. See Fig. 30. The display is easy to operate
using 4 buttons and a group of 11 LEDs that indicate the
following menu structures:
• Run Status
• Service Test
• Temperatures
• Pressures
• Set points
• Inputs
• Outputs
• Configuration
• Timeclock
• Operating Modes
• Alarms
Through the scrolling marquee the user can access all the
inputs and outputs to check on their values and status. Because
the unit is equipped with suction pressure transducers and
discharge saturation temperature sensors it can also display
Table 119 — Controls Expansion Board (CEM) Inputs
Sensor
2
CONNECTOR
PIN NO.
R1,C
2
3
7,8
5,6
1,2,3
9,10
FS
CM
IFO
R
—
I/O POINT PLUG AND PIN
NAME REFERENCE
DI 1 J7, 1-2
DI 2 J7, 3-4
DI 3 J7, 5-6
DI 4 J7, 7-8
DI 5 J7, 9-10
DI 6 J7, 11-12
DI 7 J7, 13-14
AN7 J6, 1-3
AN8 J6, 4-6
AN9 J6, 7-9
AN10 J6, 10-12
AN10 J6, 10-12
AN1 J5, 1-2
AN2 J5, 3-4
AN3 J5, 5-6
AN4 J5, 7-8
AN5 J5, 9-10
AN6 J5, 11-12
pressures typically obtained from gages. The control includes a
full alarm history, which can be accessed from the display. In
addition, through the scrolling marquee the user can access a
built-in test routine that can be used at start-up commission and
to diagnose operational problems with the unit. The scrolling
marquee is located in the main control box and is standard on
all units.
SUPPLY FAN — The size 020 to 050 units are equipped with
two 15 x 11-in. forward-curved fans. The size 051 and 060
units have three 15 x 11-in. fans. They are on a common shaft
and are driven by single belt drive 3-phase motor. The fan is
controlled directly by the ComfortLink™ controls.
VARIABLE FREQUENCY DRIVE (VFD) — On variable
volume units, the supply fan speed is controlled by a 3-phase
VFD. The VFD is located in the fan section behind a remov-
able panel as shown in Fig. 24 and 25. The VFD speed is
controlled directly by the ComfortLink controls through a 4 to
20 mA signal based on a supply duct pressure sensor. The
inverter has a display, which can be used for service diagnos-
tics, but setup of the supply duct pressure set point and control
loop factors is done through the scrolling marquee display. The
VFD is powered during normal operation to prevent condensa-
tion from forming on the boards during the off mode and is
stopped by driving the speed to 0 (by sending a 2 mA signal to
the VFD).
The A Series units use ABB ACH550 VFDs. The interface
wiring for the VFDs is shown in Fig. 31. Terminal designations
are shown in Table 121.
MODE
Run Status
Service Test
Temperature
Pressures
Setpoints
Inputs
Outputs
Configuration
Time Clock
Operating Modes
Alarms
Fig. 30 — Scrolling Marquee
122
SIGNAL PIN(S) PORT STATE
2 0 = 24vac, 1= 0vac
4 0 = 24vac, 1= 0vac
6 0 = 24vac, 1= 0vac
8 0 = 24vac, 1= 0vac
10 0 = 24vac, 1= 0vac
12 0 = 24vac, 1= 0vac
14 0 = 24vac, 1= 0vac
2 (1 = loop power) (0-20mA input)
5 (4 = loop power) (0-20mA input)
8 (7 = loop power) (0-20mA input)
11 (10 = loop power) (0-20mA input)
11 (10 = loop power) (0-20mA input)
1 (thermistor, ohms)
3 (thermistor, ohms)
5 (thermistor, ohms)
7 (thermistor, ohms)
9 (thermistor, ohms)
11 (thermistor, ohms)
Alarm Status
ESCAPE ENTER
A30-2239