Troubleshooting; Replacing Defective Modules; Compressors; Maintenance - Carrier GEMINI 38APS025-065 Installation Instructions Manual

TROUBLESHOOTING

ter ® V control requires a combination of observing system op-
eration and VFD display information. The MMV should fol-
low the 4 to 20 mA signal from the ComfortLink
The speed command from the ComfortLink controls can be
monitored in 2 ways:
1. Variables VH.PA, VH.PB in the "outputs" submenu of
ComfortLink - given as a percentage of 4 to 20 mA range.
2. P56 in Motormaster V shows 4-20 mA input in percent of
maximum input.
Refer to Table 24 for the variable definitions of each
controller.
Table 24 — Controller Cross-Reference
CONTROL VH.PA, VH.PB
SIGNAL ( COMFORT LINK)
MOTORMASTER V)
4 mA 0%
12 mA 50%
20 mA 100%
The MMV also provides real time monitoring of key in-
puts and outputs. The collective group is displayed through pa-
rameters 50-56 and all values are read only.
P50: FAULT HISTORY
P51: SOFTWARE version
P52: DC BUS VOLTAGE
Usually rated input voltage x 1.4.
P54: LOAD in percent of drives rated output current
rating
P55: VDC INPUT in percent of maximum input: 50
will indicate full scale which is 5 v
P56: 4-20 mA INPUT
20% = 4 mA, 100% = 20 mA

REPLACING DEFECTIVE MODULES

Link replacement modules are shown in Table 25. If the main
base board (MBB) has been replaced, verify that all configura-
tion data is correct. Follow the Configuration mode table and
verify that all items under sub-modes UNIT, OPT1 and OPT2
are correct. Any additional field-installed accessories or op-
tions (RSET, SLCT sub-modes) should also be verified as well
as any specific time and maintenance schedules.
Refer to the Start-Up Checklist for 38AP units (completed
at time of original start-up) found in the job folder. This infor-
mation is needed later in this procedure. If the checklist does
not exist, fill out the current information in the Configuration
mode on a new checklist. Tailor the various options and config-
urations as needed for this particular installation.
CAUTION
Electrical shock can cause personal injury. Disconnect all
electrical power before servicing.
1. Check that all power to unit is off. Carefully disconnect
all wires from the defective module by unplugging its
connectors.
2. Remove the defective module by removing its mounting
screws with a Phillips screwdriver, and removing the
module from the control box. Save the screws for later
use.
3. Verify that the instance jumper (MBB) or address switch-
es (all other modules) exactly match the settings of the
defective module.
NOTE: Handle boards by mounting standoffs only to avoid
electrostatic discharge.
4. Package the defective module in the carton of the new
module for return to Carrier.
Troubleshooting the Motormas-
controls.
4-20 mA
VFD SPEED
INPUT (P56,
(MOTORMASTER V)
20% 8 Hz
60% 26 Hz
100% 60 Hz
Last 8 faults
in percent of nominal.
in percent of maximum input:
The Comfort-
5. Mount the new module in the unit s control box using a
Phillips screwdriver and the screws saved in Step 2.
6. Reinstall all module connectors. For accessory Naviga-
tor device replacement, make sure the plug is installed
at LVT in the LEN connector.
7. Carefully check all wiring connections before restoring
power.
8. Verify the ENABLE/OFF/REMOTE CONTACT switch
is in the OFF position.
9. Restore control power. Verify that all module red LEDs
blink in unison. Verify that all green LEDs are blinking
and that the scrolling marquee or Navigator display is
communicating correctly.
10. Verify all configuration information, settings, set points
and schedules. Return the ENABLE/OFF/REMOTE
CONTACT switch to its previous position.
Table 25 — Replacement Modules
MODULE
Main Base Board (MBB)
Scrolling Marquee Display
Energy Management
Module (EMM)
Navigator Display
Compressor Expansion Board
Auxiliary Board

Compressors

Do not supply power to unit with compressor cover
removed. Failure to follow this warning can cause a fire,
resulting in personal injury or death.
Exercise extreme caution when reading compressor cur-
rents when high-voltage power is on. Correct any of the
problems described below before installing and running a
replacement compressor. Wear safety glasses and gloves
when handling refrigerants. Failure to follow this warning
can cause fire, resulting in personl injury or death.
Do not manually operate contactors. Serious damage to the
machine may result.
COMPRESSOR REPLACEMENT
faulty compressor, refer to the compressor replacement proce-
dure included with the new compressor.
OIL CHARGE Compressors are factory charged with
110 oz of POE oil. Refer to Oil Charge section page 47 for
proper oil and charge procedure.

MAINTENANCE

Recommended Maintenance Schedule —
lowing are only recommended guidelines. Jobsite conditions
may dictate that maintenance schedule is performed more often
than recommended.
59
REPLACEMENT PART NO.
(with Software)
38AP501672
HK50AA031
30GT515218
HK50AA033
HK50AA027
32GB500442EE
WARNING
WARNING
CAUTION
To change out a
The fol-