Chapter 3 Application Of Fan Speed Controller; Wiring Terminals - Emerson Liebert PEX User Manual

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 in 3.3.2 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.
Silk print
J1
J9
J3 (HP1)
J4 (HP2)
J15 (HP1)
J14 (HP2)
J17, J18
W
V
U
J1
L3
L2
L1
PE
Figure 3-1 Layout of wiring terminals
Table 3-1 Definitions of wiring terminals
Definition
AC I/O terminal
Passive dry contactor relay output (for the
power switch of fan power supply contactor)
Input terminal of voltage pressure sensor 1
(spare)
Input terminal of voltage pressure sensor 2
(spare)
Input terminal of current pressure sensor 1
Input terminal of current pressure sensor 2
Jumpers of current pressure sensor
Liebert.PEX Condenser User Manual
Chapter 3 Application Of Fan Speed Controller
J8 (SCRTemp) LCD and keys
J17
J18
D16 D22
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
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
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
Pin 1: positive terminal of 12V power
Pin 2: input terminal of 4mA ~ 20mA pressure current signal
Current pressure sensor: the short circuit ring must be installed
on the jumpers
Voltage pressure sensor: the open status of jumpers must be
kept
D15
J9
J3 (HP1)
J4 (HP2)
J14 (HP2)
J15 (HP1)
J5 (Out Temp)
J11 (RS232)
J7 (Fan1Sta)
J10 (Fan2Sta)
J6 (CompSta)
Definition of pins
9