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APPENDIX H — OPTIONAL MOTORMASTER
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.)
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 AW) 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 pressure is
below set point, the VFD could be set for manual control or the
control may be receiving faulty pressure transducer output. Cor-
rective 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 AX.
The MMV control also provides real time monitoring of key in-
puts and outputs. The collective group is displayed through pa-
rameters P50 to P56 and all values are read only. These values 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 but-
tons 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
V control.
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V CONTROL (CONT)
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 re-
sulting from erroneous low pressure readings. This process may
cause a high pressure safety cutout on circuit B compressor. 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 transducer back to
circuit A for proper unit operation.
Fault Lockout
If a fault lockout (LC) has occurred, view the fault history in P50
to find the last fault. Once P50 is displayed, use the arrow buttons
to scroll through the last 8 faults. Any current faults or fault codes
from the fault history can be analyzed using Table AY.
TO DISABLE AUTOMATIC CONTROL MODE AND
ENTER MANUAL SPEED CONTROL:
1.
Change P05 to '01- keypad'.
2.
Push UP and DOWN arrow button to set manual speed.
3.
Set P05 to proper value to restore automatic control
according to Table AX.
TO PROVIDE MANUAL START/STOP CONTROL
With power removed from VFD, remove start command jumper
and install a switch between the appropriate start terminals as re-
quired in Table AW.
EPM Chip
The drive uses a electronic programming module (EPM) chip to
store the program parameters. This is an EEPROM memory chip
and is accessible from the front of the VFD. It should not be re-
moved with power applied to the VFD.
Loss of CCN Communications
Carrier Comfort Network
control systems can be affected by high frequency electrical noise
generated by the Motormaster
grounded to eliminate ground currents along communication
lines.
If communications are lost only while Motormaster V control is in
operation, order a signal isolator (CEAS420876-2) and power
supplies (CEAS221045-01, 2 required) for the CCN communica-
tion line.
Liquid Line Pressure Set Point Adjustment
Adjusting the set point may be necessary to avoid interaction with
other head pressure control devices. If adjustment is necessary, use
the set point parameter found in P-34 for R-410A. A lower value
will result in a lower liquid line set point. As an example for
R-410A, decreasing the P-34 from 24 to 23 will decrease the liq-
uid line pressure by approximately 15 psig. It is recommended to
adjust R-410A units by 1.
256
(CCN) communications with external
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V control. Ensure unit is well
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Table of Contents
Troubleshooting
