Vertiv I Liebert Air Cooled Condenser I User Manual
16
RS485 serial communication port
The RS485 serial communication port is a port to connect the computer using factory-defined
protocol. It is used for factory commissioning and maintenance.
Keys and LCD
The keys and LCD, which can realize the functions in Table 3-3, provide the HMIs for
maintenance personnel. Refer to 3.3 Operation Description of HMI for operation of keys and
LCD HMI.
Table 3-3 Function descriptions of keys and LCD
NO.
Function
Description
1
Query the acquisition data in real
time
The acquisition data include condensing pressure, ambient
temperature, output percentage, the state of fan enable singal
and the state of alarm
2
Query the current alarm data in real
time
The current alarm data include phase loss alarm, PIM over
temperature, fan 1 over temperature, fan 2 over temperature,
fan 1 over temperature locked, fan 2 over temperature locked,
pressure sensor failure, EEPROM read fault alarm, hardware
over current and bus over voltage
3
Query the historical alarm data in
real time
The latest saved 100 historical alarms can be queried
4
Modify the configured parameters in
real time
The configured parameters include running pressure,
pressure controlling range, minimum output frequency,
maximum output frequency, fan number and pressure sensor
type, refrigerant type, jump frequency 1, jump frequency 1
range, jump frequency 2, jump frequency 2 range, jump
frequency 3, jump frequency 3 range, the curve of frequency
control, manual mode, manual mode output frequency; or
resume the default values
The keys and LCD are on the upper right corner of the fan speed controller board, as shown in
Figure 3-1. Their appearance is shown in Figure 3-2.
