205
APPENDIX F — OPTIONAL FACTORY-INSTALLED LOW AMBIENT MOTORMASTER
®
V CONTROL (cont)
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 removed with power applied to the VFD.
Loss of CCN Communications
Carrier Comfort Network
®
(CCN) communications with exter-
nal control systems can be affected by high frequency electrical
noise generated by the Motormaster
®
V control. Ensure unit is
well grounded to eliminate ground currents along communica-
tion 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 Setpoint Adjustment
Adjusting the setpoint may be necessary to avoid interaction
with ther head pressure control devices. If adjustment is neces-
sary, use the setpoint parameter found in P-34 for R-410A. A
lower value will result in a lower liquid line setpoint. As an ex-
ample for R-410A, decreasing the P-34 from 24 to 23 will de-
crease the liquid line pressure by approximately 15 psig. It is
recommended to adjust R-410A units by 1.
Table N — Fault Codes
LEGEND NOTE: The drive is programmed to automatically restart after a fault
and will attempt to restart three times after a fault (the drive will not
restart after CF, cF, GF, F1, F2-F9, or Fo faults). If all three restart
attempts are unsuccessful, the drive will trip into FAULT LOCKOUT
(LC), which requires a manual reset.
CODE DESCRIPTION RESET METHOD PROBABLE CAUSE CORRECTIVE ACTION
AF High Temperature Fault Automatic
Ambient temperature is too high;
Cooling fan has failed (if
equipped).
Check cooling fan operation.
CF Control Fault Manual
A blank EPM, or an EPM with cor-
rupted data has been installed.
Perform a factory reset using
Parameter 48 – PROGRAM
SELECTION. See Drive Program-
ming section.
cF Incompatibility Fault Manual
An EPM with an incompatible
parameter version has been
installed.
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.
F1 EPM Fault Manual The EPM is missing or damaged.
Install EPM or replace with new
EPM.
F2-F9
Fo
Internal Faults Manual
The control board has sensed a
problem
Consult factory.
GF Data Fault Manual
User data and Carrier defaults in
the EPM are corrupted.
Restore factory defaults by tog-
gling 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.
HF High DC Bus Voltage Fault Automatic
Line voltage is too high; Decelera-
tion rate is too fast; Overhauling
load.
Check line voltage — set P01
appropriately.
JF Serial Fault Automatic
The watchdog timer has timed out,
indicating that the serial link has
been lost.
Check serial connection (com-
puter). Check settings for P15.
Check settings in communication
software to match P15.
LF Low DC Bus Voltage Fault Automatic Line voltage is too low.
Check line voltage — set P01
appropriately.
OF Output Transistor Fault Automatic
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.
Reduce boost or increase acceler-
ation values. If unsuccessful,
replace drive.
PF Current Overload Fault Automatic
VFD is undersized for the applica-
tion; Mechanical problem with the
driven equipment.
Check line voltage – set P01
appropriately.
Check for dirty coils.
Check for motor bearing failure.
SF Single-phase Fault Automatic
Single-phase input power has
been applied to a three-phase
drive.
Check input power phasing.
Drive displays “---”
even though drive
should be running
Start Contact is Not Closed Automatic
Start contact is missing or not
functioning.
Check fan relay.
VFD flashes “---” and
LCS
Start Contact is Not Closed Automatic Start contact not closed. Check FR for closed contact.
VFD flashes 57 (or 47)
and LCS
Speed Signal Lost Automatic
Speed signal lost. Drive will oper-
ate at 57 (or 47) Hz until reset or
loss of start command. Resetting
requires cycling start command (or
power).
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.
EPM — Electronic Programming Module
FR — Fan Relay
LCS — Loss of Control Signal
TB — Terminal Block
VFD — Variable Frequency Drive
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