12
i. Run the FR-B cable through the 1/2-in. connector
of the MMV-B enclosure (do not tighten connector
screws at this time). Connect black wire to MMV-
B terminal 2 and red wire to MMV-B terminal 1,
13A, or 13C (see Table 4). Place the other small
varnish cloth 38C24601 around both cables at the
point they enter the 1/2-in. connector. Tighten
down connector screws being careful not to dam-
age the cables.
9. Bundle excess wire and dress harnesses with wire ties.
10. Reattach control box, MMV enclosure, and cable tray
covers.
Step 3 — Configure Motormaster
®
V Con-
trol —
The Motormaster V control is configured for an oper-
ation mode of internal PI (pressure independent) control and 0
to 5V feedback by installing the start contactor according to
Table 4. No additional programming is required. Note that the
pressure transducer must be attached for proper configuration.
Table 4 — Configuration Table
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 pressure input. Ensure that fans are rotating
clockwise (as viewed from above). If rotation is back-
ward, 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 200 psig liquid line pressure for R-22 units and
320 psig for R-410A units. Above that pressure, the fan should
operate at full speed.
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. The pressure transducer is con-
nected to terminals 2, 5 and 6 on the controller. The controller
is configured by jumper wires and sensor input types. No field
programming is required. If controller does not function prop-
erly, the information provided below can be used to program
and troubleshoot the drive.
Drive Programming —
Table 5 shows all program pa-
rameters for each of the operating modes. Refer to Trouble-
shooting section before attempting to change programming in
the Motormaster V control.
TO ENTER PASSWORD AND CHANGE PROGRAM
VALUES:
1. Press MODE.
2. The display will read “00” and the upper right-hand deci-
mal point will be blinking. This will activate the PASS-
WORD prompt (if the password has not been disabled).
3. Use the UP and DOWN buttons to scroll to the password
value (the factory default password is “111”) and press
the MODE button. Once the correct password value is en-
tered, the display will read “P01”, which indicates that the
PROGRAM mode has been accessed at the beginning of
the parameter menu (P01 is the first parameter).
NOTE: If the display flashes “Er”, the password was incorrect,
and the process to enter the password must be repeated.
Fig. 11 — MMV Control Mounting with 48/50A2,A3,A4,A5060 MCHX Units
a48-8405
NOMINAL
VOLTAGE
(V-Ph-Hz)
MODE
CONTROL INPUT
(Pin 5)
START
CONTACTS
230-3-60
460-3-60
575-3-60
1
Internal PI control,
0-5V feedback
TB 1,2
208-3-60
380-3-60
2
TB 13A,2
400-3-50
4
TB 13C,2
CAUTION
It is strongly recommended that the user NOT change any
programming without consulting Carrier service personnel.
Unit damage may occur from improper programming.
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