Vertiv Liebert DSE500, Installer/User Manual

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8.9 Replacing the Premium-efficiency Control Board
Use these steps to replace the Premium-efficiency Control Board in the condenser.
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power-supply
disconnect switches, verify with a voltmeter that power is Off and wear appropriate,
OSHA-approved personal protective equipment (PPE) per NFPA 70E before working within the
electric control enclosure. Failure to comply can cause serious injury or death. Customer must
provide earth ground to unit, per NEC, CEC and local codes, as applicable. Before proceeding
with installation, read all instructions, verify that all the parts are included and check the
nameplate to be sure the voltage matches available utility power. The Liebert® controller does
not isolate power from the unit, even in the “Unit Off” mode. Some internal components require
and receive power even during the “Unit Off” mode of the controller. The factory-supplied
disconnect switch is inside the unit. The line side of this switch contains live high-voltage. The
only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to unit electrical schematic. Follow all local codes.
8.9.1 Preparing to Replace the Board
1. Verify that the following jumpers are installed on the new board (see Figure 8.6 on the facing
page):
• Jumper at J4 and J6 on Pins 2 and 3.
• Jumper on J2.
• Jumper on J5 on Pins 1 and 2.
2. Locate the latest revision of the HMI parameters label, 303847P1, included with the new control
board.
NOTE: In Figure 8.6 on the facing page, J6 is the CANbus termination jumper. J4 is the RS485 service
termination jumper. If the condenser is the last device in the CANbus communication line, the jumper
must be placed between Pins 1 and 2 of J6. If the condenser is not the last device in the CANbus
communication line, the jumpers on J6 must be placed on Pins 2 and 3. If the jumper is not in the
correct positions, CANbus communication errors may occur. The jumper on J4 will always be placed
between Pins 1 and 2.
NOTE: In Figure 8.6 on the facing page, a jumper must be present at J2. If a jumper is not present, the
control board will not boot properly during power startup.
Vertiv | Liebert® DSE500™ Installer/User Guide
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