Table of Contents
10
Chapter 3 Application Of Fan Speed Controller
Silk print
J5 (Out Temp)
J11 (RS232)
J7 (Fan1Sta)
J10 (Fan2Sta)
J6 (CompSta)
Note:
J8 (SCRTemp) in Figure 3-1 is the interface of fan speed controller board, and not to be used by users
3.2 HMI
The fan speed controller operation and setup is provided through indicators, RS232 serial communication port, keys
and LCD.
Indicators
There are three indicators (see Figure 3-1) on the fan speed controller board. See Table 3-2 for the functions of
indicators.
Silk print
D16
Power indicator
D22
Run indicator
Power switch controlling
D15
indicator of AC contactor
RS232 serial communication port
The RS232 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.
NO.
Query the acquisition data in real
1
time
Query the current alarm data in real
2
time
Query the historical alarm data in
3
real time
Modify the configured parameters in
4
real time
Definition
Input terminal of ambient temperature sensor
(spare)
Serial communication interface (used for
maintenance)
Detecting terminal of fan 1 over temperature
state
Detecting terminal of fan 2 over temperature
state
Detecting terminal of compressor state
Table 3-2 Functions of indicators
Definition
Color
Green
Green
Red
Table 3-3 Function descriptions of keys and LCD
Function
The acquisition data include condensing pressure, ambient temperature, silicon
controlled rectifier (SCR) temperature and output percentage
The current alarm data include phase loss alarm, SCR over temperature, fan 1 over
temperature, fan 2 over temperature, pressure sensor failure, EEPROM read fault
alarm, SCR temperature sensor failure and abnormal frequency
The latest saved 100 historical alarms can be queried
The configured parameters include running pressure, pressure controlling range,
minimum voltage, maximum voltage, fan number and pressure sensor type; or
resume the default values
Liebert.PEX Condenser User Manual
Pin 1: input terminal of temperature signal
Pin 2: signal ground
Pin 1: communication ground
Pin 2: reception terminal of communication
Pin 3: transmission terminal of communication
Pin 1: output terminal of 19Vac signal
Pin 2: return terminal of 19Vac signal
State
The CPU circuit of fan speed controller board is
On
supplied with 5V power
Off
The fan speed controller board is faulty
On or off
The fan speed controller board is faulty
Blinking at 1Hz (slowly)
The system is running normally without alarm
Blinking at 5Hz (quickly)
There is an alarm or the compressor is shut down
The control switch which supplies the AC contactor
On
with the driving power is open
The control switch which supplies the AC contactor
Off
with the driving power is closed
Definition of pins
Function
Description
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