Controls Expansion Board CEM Inputs, Scrolling Marquee

Table 119 — Controls Expansion Board (CEM) Inputs

POINT	POINT DESCRIPTION	I/O POINT	PLUG AND PIN	SIGNAL PIN(S)	PORT STATE
NAME	POINT DESCRIPTION	NAME	REFERENCE	SIGNAL PIN(S)	PORT STATE
NAME		NAME	REFERENCE
INPUTS
SFS	Supply Fan Status switch	DI 1	J7, 1-2	2	0 = 24vac, 1= 0vac
DMD_SW1	Demand Limit - SW1	DI 2	J7, 3-4	4	0 = 24vac, 1= 0vac
DMD_SW2/	Demand Limit - SW2/	DI 3	J7, 5-6	6	0 = 24vac, 1= 0vac
DHD ISCIN	Dehumidification Switch Input	DI 3	J7, 5-6	6	0 = 24vac, 1= 0vac
DHD ISCIN	Dehumidification Switch Input
PRES	Pressurization	DI 4	J7, 7-8	8	0 = 24vac, 1= 0vac
EVAC	Evacuation	DI 5	J7, 9-10	10	0 = 24vac, 1= 0vac
PURG	Purge	DI 6	J7, 11-12	12	0 = 24vac, 1= 0vac
IAQIN	Indoor Air Quality Switch	DI 7	J7, 13-14	14	0 = 24vac, 1= 0vac
		AN7	J6, 1-3	2 (1 = loop power)	(0-20mA input)
DMDLMTMA	4-20mA Demand Limit	AN8	J6, 4-6	5 (4 = loop power)	(0-20mA input)
EDTRESMA	4-20mA Evaporator Discharge SP Reset	AN9	J6, 7-9	8 (7 = loop power)	(0-20mA input)
OAQ	Outside Air CO2 Sensor	AN10	J6, 10-12	11 (10 = loop power)	(0-20mA input)
SPRESET	SP Reset milliamps	AN10	J6, 10-12	11 (10 = loop power)	(0-20mA input)
CEM_10K1/	CEM AN1 10k temp J5,1-2/	AN1	J5, 1-2	1	(thermistor, ohms)
CEM_4201	CEM AN1 4-20 ma J5,1-2	AN1	J5, 1-2	1	(thermistor, ohms)
CEM_4201	CEM AN1 4-20 ma J5,1-2
CEM_10K2/	CEM AN2 10k temp J5,3-4/	AN2	J5, 3-4	3	(thermistor, ohms)
CEM_4202	CEM AN2 4-20 ma J5,3-4	AN2	J5, 3-4	3	(thermistor, ohms)
CEM_4202	CEM AN2 4-20 ma J5,3-4
CEM_10K3/	CEM AN3 10k temp J5,5-6/	AN3	J5, 5-6	5	(thermistor, ohms)
CEM_4203	CEM AN3 4-20 ma J5,5-6	AN3	J5, 5-6	5	(thermistor, ohms)
CEM_4203	CEM AN3 4-20 ma J5,5-6
CEM_10K4/	CEM AN4 10k temp J5,7-8/	AN4	J5, 7-8	7	(thermistor, ohms)
CEM_4204	CEM AN4 4-20 ma J5,7-8	AN4	J5, 7-8	7	(thermistor, ohms)
CEM_4204	CEM AN4 4-20 ma J5,7-8
		AN5	J5, 9-10	9	(thermistor, ohms)
		AN6	J5, 11-12	11	(thermistor, ohms)

Table 120 — IGC Board Inputs and Outputs

POINT NAME	POINT DESCRIPTION	CONNECTOR
POINT NAME	POINT DESCRIPTION	PIN NO.
		PIN NO.
INPUTS
RT	24 Volt Power Supply	R1,C
W	Heat Demand	2
G	Fan	3
LS	Limit Switch	7,8
RS	Rollout Switch	5,6
SS	Hall Effect Sensor	1,2,3
CS	Centrifugal Switch (Not Used)	9,10
FS	Flame Sense	FS
OUTPUTS
CM	Induced Draft Motor	CM
IFO	Indoor Fan	IFO
R	24 Volt Power Output (Not Used)	R
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

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	Alarm Status
Outputs	ESCAPE	ENTER
Configuration
Time Clock
Time Clock
Operating Modes	A30-2239
Alarms	A30-2239
Alarms

Fig. 30 — Scrolling Marquee

122

Carrier 48/50AJ specifications Controls Expansion Board CEM Inputs, IGC Board Inputs and Outputs

Models: 48/50AJ

Table 119 — Controls Expansion Board (CEM) Inputs

Table 120 — IGC Board Inputs and Outputs

Fig. 30 — Scrolling Marquee