Test Equipment Needed To Troubleshoot; Verify That Dc Bus Capacitors Are Discharged; Main Control Board (Mcb) Components - Carrier 19XR Start-Up And Service Instructions

5. To see faults, select Faults/Alarms from left side menu. The
fault can also be cleared from this menu by selecting "Clear
Trip." See Fig. 29.
Fig. 29 — CCW Faults and Alarms

TEST EQUIPMENT NEEDED TO TROUBLESHOOT

An isolated multimeter adequately rated for the DC bus voltage will
be needed to measure DC bus voltage and to make resistance checks.
Note that dedicated troubleshooting test points are not provided.

VERIFY THAT DC BUS CAPACITORS ARE DISCHARGED

The drive's DC bus capacitors retain hazardous voltages after in-
put power has been disconnected. Perform the following steps be-
fore touching any internal components:
1. Turn off and lock out input power. Wait 5 minutes.
2. Verify that there is no voltage at the drive's input power
terminals.
3. Measure the DC bus potential with a voltmeter while stand-
ing on a non-conductive surface and wearing insulated
gloves (1000-v). Measure the DC bus potential. The voltage
between DC+ and DC-, and from each DC terminal to the
chassis must be zero before proceeding.
4. Once the drive has been serviced, reapply input power.

MAIN CONTROL BOARD (MCB) COMPONENTS

Figure 30 shows the drive module with the cover removed. To
access the control boards, loosen the screw on the face of the
keypad mount and swing the keypad mount upward.
The components on the main control board (MCB) are shown in
Fig. 31 and 32. As previously indicated insure J1 Enable Jumper
is OUT and J2 Safety jumper is IN. The main control board has
one digital input 0. This is used as a dedicated hardware enable
that are unaffected by drive parameter settings with the
ENABLE jumper removed.
NOTE: The new board will come with the ENABLE jumper
installed and will have to be removed prior to installation into
drive.
If a 19MV unit displays an E-Stop Alarm or No Amp Sensed
alarm OR if a 19XR unit displays a high condenser pressure
alarm, then the connections of the E-Stop/VFD_LOCK or HPR
relays should be checked.
Typical wiring schematics are shown in APPENDIX A — WIR-
ING SCHEMATICS.
Enable Jumper
(Remove)
Fig. 30 — Drive Module with Cover Removed
21
Ethernet Port Selectors
IP: 192.168.1.XXX
Mask: 255.255.0.0
Ethernet Port
TB1 for Laptop CCW
Connection