Carrier WeatherExpert 48N2 Controls, Start-Up, Operation, Service, And Troubleshooting page 255

APPENDIX G — OPTIONAL MOTORMASTER
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 R.
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 Q.
TO PROVIDE MANUAL START/STOP CONTROL
With power removed from VFD, remove start command jump-
er and install a switch between the appropriate start terminals
as required in Table P.
EPM Chip
The drive uses a electronic programming module (EPM) chip
to store the program parameters. This is an EEPROM memory
CODE
AF High Temperature Fault
CF Control Fault
cF Incompatibility Fault
F1 EPM Fault
F2—F9
Internal Faults
Fo
GF Data Fault
HF High DC Bus Voltage Fault
JF Serial Fault
LF Low DC Bus Voltage Fault
OF Output Transistor Fault
PF Current Overload Fault
SF Single-phase Fault
Drive displays
"---" even though
Start Contact is Not Closed
drive should be
running
VFD flashes
"---"
Start Contact is Not Closed
and LCS
VFD flashes 57 (or 47)
Speed Signal Lost
and LCS
LEGEND
EPM — Electronic Programming Module
FR — Fan Relay
LCS — Loss of Control Signal
TB — Terminal Block
VFD — Variable Frequency Drive
Table R — Fault Codes
RESET
DESCRIPTION
METHOD
Automatic Ambient temperature is too high; Cooling
Manual
Manual
Manual
Manual
Manual
Automatic
Automatic
Automatic Line voltage is too low.
Automatic
Automatic
Automatic
Automatic
Automatic Start contact not closed.
Automatic
® V CONTROL (CONT)
chip and is accessible from the front of the VFD. It should not
be removed 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
communication 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.
PROBABLE CAUSE
fan has failed (if equipped).
A blank EPM, or an EPM with corrupted
data has been installed.
An EPM with an incompatible parameter
version has been installed.
The EPM is missing or damaged.
The control board has sensed a
problem.
User data and Carrier defaults in the EPM
are corrupted.
Line voltage is too high; Deceleration rate
is too fast; Overhauling load.
The watchdog timer has timed out,
indicating that the serial link has been
lost.
Phase to phase or phase to ground short
circuit on the output; Failed output
transistor; Boost settings are too high;
Acceleration rate is too fast.
VFD is undersized for the application;
Mechanical problem with the driven
equipment.
Single-phase input power has been
applied to a 3-phase drive.
Start contact is missing or not
functioning.
Speed signal lost. Drive will operate at 57
(or 47) Hz until reset or loss of start
command. Resetting requires cycling
start command (or power).
NOTE: The drive is programmed to automatically restart after a fault
and will attempt to restart 3 times after a fault (the drive will not restart
after CF, cF, GF, F1, F2-F9, or Fo faults). If all 3 restart attempts are
unsuccessful, the drive will trip into FAULT LOCKOUT (LC), which
requires a manual reset.
255
(CCN) communications with external
®
V control. Ensure unit is well
®
CORRECTIVE ACTION
Check cooling fan operation.
Perform a factory reset using Parameter 48 –
PROGRAM SELECTION. See Drive
Programming section.
Either remove the EPM or perform a factory
reset (Parameter 48) to change the parameter
version of the EPM to match the parameter
version of the drive.
Install EPM or replace with new EPM.
Consult factory.
Restore factory defaults by toggling P48 to
another mode. Then set P48 to desired mode
to restore all defaults for that mode. See Drive
Programming section. If that does not work,
replace EPM.
Check line voltage — set P01 appropriately.
Check serial connection (computer).
Check settings for P15.
Check settings in communication software to
match P15.
Check line voltage — set P01 appropriately.
Reduce boost or increase acceleration values.
If unsuccessful, replace drive.
Check line voltage – set P01 appropriately.
Check for dirty coils.
Check for motor bearing failure.
Check input power phasing.
Check fan relay.
Check FR for closed contact.
Transducer signal lost. Check VDC signal
between TB5 and TB2. Should be in range of
0.5V to 4.5V. 5VDC output should be present
between TB6 and TB2.