Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 253

APPENDIX G — OPTIONAL MOTORMASTER
Drive Programming
Table Q shows all program parameters for each of the operat-
ing modes. Refer to Troubleshooting section before attempting
to change programming in the Motormaster V control.
CAUTION
It is strongly recommended that the user NOT change any
programming without consulting Carrier service personnel.
Unit damage may occur from improper programming.
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
entered, 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.
4. Press MODE to display present parameter setting. The
upper right decimal point blinks. Use UP and DOWN but-
tons 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 blinking,
indicating that the present parameter setting is being dis-
played. Use the UP and DOWN buttons to change setting.
Press MODE to store new setting.
6. Press MODE to store the new setting and also exit the PRO-
GRAM mode. To change another parameter, press the
MODE button again to re-enter the PROGRAM 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 2 minutes of exiting the PROGRAM
mode, the password is not required to access the parameters.
7. After 2 minutes, the password must be entered in order to
access the parameters again.
TO CHANGE PASSWORD
Enter the current password, then change P44 to the desired
password.
TO RESET FACTORY DEFAULTS
To recognize a factory reset, the MMV controller must see a
change in P48.
1. Cycle power from Motormaster
2. Enter PROGRAM mode by entering password.
3. Scroll to P48 by using UP and DOWN buttons, and then
press MODE. One of the 12 mode numbers will appear.
(Modes 1, 2, and 4 are used for these units.)
V control.
®
® V CONTROL (CONT)
4. Restore factory defaults by changing the value in P48
using UP and DOWN buttons and then storing the value
by pressing MODE.
5. Press MODE again to re-display the value of P48.
6. Change the value of P48 to the desired factory default
mode (see Table Q) using UP and DOWN buttons, then
press MODE. The Motormaster V control is now restored
to factory settings.
TROUBLESHOOTING
Troubleshooting the Motormaster V control requires a combina-
tion of observing system operation and VFD display information.
If the liquid line pressure is above the set point and the VFD is
running at full speed, this is a normal condition. The fan CAN-
NOT go any faster to maintain set point.
If the VFD is not slowing down, even though liquid line pres-
sure is below set point, the VFD could be set for manual con-
trol or the control may be receiving faulty pressure transducer
output. Corrective action would include:
• Check that VDC signal between TB5 and TB2 is between
0.5 v and 4.5 v.
• Restore VFD to automatic control.
• Change parameter P05 back to correct value shown in
Table Q.
The MMV control also provides real-time monitoring of key
inputs and outputs. The collective group is displayed through
parameters P50 to P56 and all values are read only. These val-
ues can be accessed without entering a password.
Press MODE twice and P50 will appear.
Press MODE again to display value.
To scroll to P51-P56 from P50, use UP and DOWN buttons
then press MODE to display the value.
• P50: FAULT HISTORY — Last 8 faults
• P51: SOFTWARE version
• P52: DC BUS VOLTAGE — in percent of nominal. Usu-
ally rated input voltage x 1.4
• P53: MOTOR VOLTAGE — in percent of rated output
voltage
• P54: LOAD — in percent of drives rated output current
• P55: VDC INPUT — in percent of maximum input:
100% will indicate full scale which is 5 v
• P56: 4-20 mA INPUT — in percent of maximum input.
20% = 4 mA, 100% = 20 mA
NOTE: The Motormaster V transducer is attached to Circuit A.
If Circuit A compressor power is interrupted (overload, high-
pressure cutout, etc.) the outdoor fans will operate at a reduced
speed resulting from erroneous low pressure readings. This pro-
cess may cause a high pressure safety cutout on Circuit B com-
pressor. If only Circuit B is capable of operating for a temporary
period of time because of a Circuit A problem, the transducer
will have to be moved to the Circuit B service port until Circuit
A can be repaired. Once the problem is repaired, move the trans-
ducer back to Circuit A for proper unit operation.
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