Carrier 48/50P5030-100 Start-Up, a48-8568, Configuration Table, Configuration→COOL→M.M. = YES

ROUTE THROUGH

SNAP BUSHING

MOTORMASTER A

CONTROL

MOTORMASTER B

CONTROL

a48-8568

REMOVE TWO FAN DECKS TO

GAIN ACCESS TO ROUTE WIRING TO

OFM 2 AND OFM 6

REMOVE PANEL

TRANSDUCER	A			RUN ELECTRICAL HARNESSES
				UP THE SIDE OF THE UNIT
				IN THE SPACE BETWEEN THE
				CORNER POST AND THE
				CONTROL BOX. ROUTE WIRES
				INTO WIRE TRAY AND RUN
				TO MMV A/B AND OFM 6/2
			B
		TRANSDUCER

Fig. 10 — MMV Control Mounting — 48/50P090,100 Units

Step 3 — Configure Motormaster® V Con- trol — The Motormaster V control is configured for propor- tional integral (PI) control mode. The Motormaster V varies the condenser fan motor speedto maintain a set point of 320 psig liquid line pressure in response to a 0 to 5 vdc feed- back signal from the liquid line pressure transducer. No addi- tional programming is required. See Table 4. Note that the pressure transducer must be attached for proper configuration.

Table 4 — Configuration Table

NOMINAL		CONTROL INPUT	START
VOLTAGE	MODE
		(Pin 5)	CONTACTS
(V-Ph-Hz)
230-3-60
460-3-60	1		TB 1,2
575-3-60		Internal PI control,
208-3-60	2	0-5V feedback	TB 13A,2
380-3-60
400-3-50	4		TB 13C,2

The following ComfortLink control configurations must be set when using a Motormaster V device:

•Configuration→COOL→M.M. = YES

•Configuration→COOL→LLAG = CIRCUIT A (size 030-060 units only)

Step 4 — Test Motormaster V Control — To test the control and motor in the test mode, run compressor no. 1. The Motormaster V electronic control adjusts the fan speed based on the liquid line pressure input. Ensure that fans are rotating clockwise (as viewed from above). If rotation is backward,

lock out all power then swap 2 leads AFTER the Motormaster V control.

START-UP

The Motormaster V electronic control will be powered up as long as unit voltage is present. When the system calls for cooling, the fan relay will be energized to initiate the start-up sequence for the Motormaster V electronic control. The LED (light-emitting diode) will display the speed of the motor. The display range will be 8 to 60 Hz. The Motormaster V electronic control will start the condenser fan when the compressor en- gages. The control will adjust the fan speed to maintain ap- proximately 320 psig. Above that pressure, the fan should op- erate at full speed.

For size 030-060 units, the Motormaster V control uses a 0 to 5 vdc signal input from a pressure transducer attached to the liquid line service valve gage port on circuit A.

For size 070-100 units, two Motormaster V devices are used, one for each circuit. The circuit A Motormaster V control uses a 0 to 5 vdc signal input from a pressure transducer at- tached to the liquid line service valve gage port on circuit A. The circuit B Motormaster V control uses a 0 to 5 vdc signal input from a pressure transducer attached to the liquid line ser- vice valve gage port on circuit B.

The pressure transducer(s) are connected to terminals 2, 5 and 6 on the controller. The controller is configured by jumper wires and sensor input types. No field programming is re- quired. If controller does not function properly, the information provided below can be used to program and troubleshoot the drive.

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