199
APPENDIX F — OPTIONAL 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 external control sys-
tems can be affected by high frequency electrical noise gener-
ated by the Motormaster
®
V control. Ensure unit is well
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 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
example for R-410A, decreasing the P-34 from 24 to 23 will
decrease 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
corupted data has been in-
stalled.
Perform a factory reset using Pa-
rameter 48 – PROGRAM SELEC-
TION. See Drive Programming sec-
tion.
cF
Incompatibility Fault
Manual
An EPM with an incompatible
parameter version has been in-
stalled.
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 dam-
aged.
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 toggling
P48 to another mode. Then set P48
to desired mode to restore all de-
faults for that mode. See Drive Pro-
gramming section. If that does not
work, replace EPM.
HF
High DC Bus Voltage Fault
Automatic
Line voltage is too high; Decel-
eration rate is too fast; Over-
hauling load.
Check line voltage — set P01 ap-
propriately.
JF
Serial Fault
Automatic
The watchdog timer has timed
out, indicating that the serial link
has been lost.
Check serial connection (comput-
er). 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 ap-
propriately.
OF
Output Transistor Fault
Automatic
Phase to phase or phase to
ground short circuit on the out-
put; Failed output transistor;
Boost settings are too high; Ac-
celeration rate is too fast.
Reduce boost or increase accelera-
tion values. If unsuccessful, replace
drive.
PF
Current Overload Fault
Automatic
VFD is undersized for the appli-
cation; 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 op-
erate at 57 (or 47) Hz until reset
or loss of start command. Re-
setting 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 be-
tween TB6 and TB2.
EPM
—
Electronic Programming Module
FR
—
Fan Relay
LCS
—
Loss of Control Signal
TB
—
Terminal Block
VFD
—
Variable Frequency Drive
Summary of Contents for Carrier Weathermaker 48A2
Page 105: ...105 Fig 20 Typical Main Control Box Wiring Schematic 48 50A2 A3 A4 A5 Units...
Page 106: ...106 Fig 21 Typical Auxiliary Control Box Wiring Schematic...
Page 107: ...107 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown a48 8357...
Page 108: ...108 TO NEXT PAGE Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown A48 7296...
Page 109: ...109 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont A48 8358...
Page 110: ...110 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown a50 8228...
Page 111: ...111 Fig 25 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown...
Page 112: ...112 Fig 26 Typical Low Ambient Controls Option Wiring...
Page 113: ...113 Fig 27 Typical Small Chassis Component Location Size 020 035 Units...
Page 114: ...114 Fig 28 Typical Large Chassis Component Locations Size 040 060 Units...
Page 118: ...118 Fig 30 Economizer Control Board ECB1 and VAV Control Board ECB2 A48 7706...
Page 142: ...142 A48 3733 Fig 56 Main Burner Removal...
Page 176: ...176 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716...
