Chapter 3 Application Of Fan Speed Controller 9
Chapter 3 Application Of Fan Speed Controller
This chapter introduces the use of the fan speed controller, which includes the definitions of wiring terminals,
introduction of human-machine interface (HMI) and operation of HMI. This chapter is mainly provided for the factory
maintenance personnel. It is recommended that users should not operate the fan speed controller unless necessary.
Note
The configured fan number must be the same as the number of the actual fans, or else a false alarm will be generated. Refer to
Configuration data main menu interface
for detailed settings.
3.1 Wiring Terminals
The wiring terminals are located on the fan speed controller board (see Figure 2-5 and Figure 2-6). Their distribution is
shown in Figure 3-1 and the definitions are listed in Table 3-1. Refer to
Appendix 1 Circuit Diagram
for detailed
connections.
J9
J3 (HP1)
J4 (HP2)
J14 (HP2)
J15 (HP1)
J5 (Out Temp)
J11 (RS232)
J7 (Fan1Sta)
J10 (Fan2Sta)
J6 (CompSta)
W
V
U
L3
L1
L2
PE
J8 (SCRTemp)
J17
J18
J1
D16
D22
D15
LCD and keys
Figure 3-1 Layout of wiring terminals
Table 3-1 Definitions of wiring terminals
Silk print
Definition
Definition of pins
J1
AC I/O terminal
PE: protection earth
L1, L2, L3: three-phase AC input
U, V, W: three-phase AC output, which connects with the
power supply terminals
The middle terminal pin without logo is reserved
J9
Passive dry contactor relay output (for the
power switch of fan power supply contactor)
Pin 1: normally closed terminal of relay, which is reserved
Pin 2: common terminal of relay, which is used for AC input
Pin 3: normally open terminal of relay, which is used for AC
output
J3 (HP1)
Input terminal of voltage pressure sensor 1
(spare)
J4 (HP2)
Input terminal of voltage pressure sensor 2
(spare)
Pin 1: positive terminal of 5V power
Pin 2: input terminal of 0.5V ~ 4.5V pressure voltage signal
Pin 3: negative terminal of 5V power
J15 (HP1)
Input terminal of current pressure sensor 1
J14 (HP2)
Input terminal of current pressure sensor 2
Pin 1: positive terminal of 12V power
Pin 2: input terminal of 4mA ~ 20mA pressure current signal
J17, J18
Jumpers of current pressure sensor
Current pressure sensor: the short circuit ring must be installed
on the jumpers
Voltage pressure sensor: the open status of jumpers must be
kept
Liebert.PEX Condenser User Manual
