Specifications

25
START-UP
When the system calls for the fan, the fan relay will be ener-
gized to start the Motormaster® V electronic control. The LED
will display the speed of the motor. The display range will be
8 to 50 Hz for 50 Hz units and 8 to 60 Hz for 60 Hz units. The
Motormaster V control will start the condenser fan when the
compressor engages. The control will adjust the fan speed to
maintain approximately 135 psig liquid line pressure for R-22
operation (85 psig for R-134a operation). 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 each circuit. 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 drive does not function properly,
the information provided below can be used to program and
troubleshoot the drive.
Drive Programming — Refer to Table 9 for Motor-
master V program parameters for each of the operating modes.
Refer to troubleshooting section below before attempting to
change programming in the Motormaster V control.
To enter password and change program values:
1. Press the MODE button on the Motormaster V controller.
The upper right decimal point will flash and the display
will read “00”.
2. To enter the programming mode to access the parameters,
press the MODE button. This will activate the PASS-
WORD prompt (if the password has not been disabled).
The display will read “00” and the upper right-hand deci-
mal point will be flashing.
3. Use the DOWN and UP buttons to scroll to the password
value (the factory default password is “111”) then press
the MODE button. Once the correct password value is
entered, the display will read “P01”, indicating that the
programming mode has been accessed at the beginning of
the parameter menu (P01 is the first parameter).
NOTE: If the display flashes “Er”, then the password was
incorrect, and the process to enter the password must be
repeated.
4. Press MODE to display present parameter setting. The
upper right decimal point will flash. Use DOWN arrow
button and the UP arrow button to scroll to the desired
parameter number.
5. Once the desired parameter number is found, press the
MODE button to display the present parameter setting.
The upper right-hand decimal point will begin flashing,
indicating that the present parameter setting is being dis-
played, and that it can be changed by using the UP and
DOWN buttons.
6. Use the DOWN arrow and UP arrow buttons to change
setting then press Mode to store the new setting. Pressing
the Mode button will store the new setting and also exit
the Programming mode.
7. To change another parameter, press the MODE button
again to re-enter the programming mode (the parameter
menu will be accessed at the parameter that was last
viewed or changed before exiting). If the MODE button
is pressed within two minutes of exiting the programming
mode, the password is not required access the parameters.
After two minutes, the password must be entered in order
to access the parameters again.
To change password:
1. Enter the current password.
2. Change parameter P44 to the desired password.
To reset factory defaults:
To recognize a factory reset, the VFD (variable frequency
drive) must see a change in P48 while start contact is removed.
See Table 8.
1. Remove power from the Motormaster V control.
2. Remove start contact and then apply power to Motor-
master V control.
3. Enter Programming mode by entering password (see
above).
4. Scroll to P48 by using UP and DOWN arrow buttons and
then press MODE. One of the 12 mode numbers will
appear.
5. Restore factory defaults by changing the value in P48 us-
ing UP and DOWN arrow buttons and then storing the
value by pressing MODE.
6. Press MODE again to re-display the value of P48.
Change the value of P48 to the desired factory default
mode using the UP and DOWN arrow buttons then press
MODE.
7. Motormaster V control is now restored to factory settings.
8. Remove power from Motormaster V control.
9. Reinstall start contact matching the mode selected in the
above steps and reapply power to drive.
It is strongly recommended that the user NOT change
any programming without consulting Carrier service
personnel. Unit damage may occur from improper
programming.