Emerson user manual Liebert FPC, +24VDC, Unit EPO, Main, Source Input Breaker, Shunt, Trip

Page 24

Installation Instructions

1.3.6Control Wiring Connections

NEC Article 645 requires that emergency power off (EPO) switches be located at the principal room exits. All standard Liebert power conditioning systems have provisions for external shutdown control from Remote Emergency Power Off (REPO) stations. Figure 14 is a simplified diagram of the shut- down circuitry of the Liebert FPC.

Low-Voltage Control Circuit

Control wiring connections must comply with the NEC and all other applicable codes.

! WARNING

Verify that all incoming high-voltage (power) and low-voltage (control) circuits are de-energized and locked out before installing cables or making connections, whether in the junction box or in the unit.

As shown in Figure 14, the control circuit operates on 24VDC. The shutdown device (represented by the REPO switch) activates a low-current, 24VDC relay that in turn operates the shunt-trip mecha- nism. The shunt-trip solenoid opens the Main Input Breaker, which de-energizes the power center.

Multiple-Unit Shutdown

When more than one power center is installed by the user, a typical requirement is that actuation of a single device (REPO for example) must shut down all power centers. The low-voltage control circuits of all standard Liebert FPC systems are designed to meet this requirement.

External Control Wiring Connections

External control wiring connections for remote shutdown, alarm, and/or monitoring are made to the low-voltage junction box (if used) or to the low-voltage control terminal strip located inside the unit.

Control wiring connections vary with the type of monitoring system furnished with the unit. Two typ- ical control wiring configurations are shown in Figures 15 and 16.

Figure 14 Simplified shutdown circuit

 

Liebert FPC

 

Remote

 

 

 

 

 

 

Shutdown

 

 

 

+24VDC

1

Devices

 

 

K5

K6

 

 

 

 

 

 

 

 

 

 

 

 

 

Unit EPO

4

 

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

 

24VDC

Main

 

 

N.O. REPO

 

 

Source

Input

K6

6

 

 

 

 

-

Breaker

Overtemp

 

N.C. REPO

 

Shunt

Switch

 

 

 

Trip

K5

2

 

 

 

 

 

 

 

 

A

7

4

1

 

 

 

3

 

 

 

Building

 

 

 

 

 

 

Interface

 

 

 

 

 

 

 

 

 

 

 

R1

 

 

Relay

 

 

 

 

B

9

6

3

20

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Contents Liebert FPC Page Table of Contents Figures Important Safety Instructions Unpacking and Installation Unpacking and Preliminary InspectionHandling Considerations Inch cabinet weight Footprint and Floor cable access Cutout Dimensions cooling airflowFront FrontUnit Preparation Location ConsiderationsSee Notes 2 Front and rear access is required. See Notes 1 Liebert FPC heat outputFull Load Heat Output Unit kVA BTU/Hr kW Floor Pedestal Installation Floor pedestal detailsAdditional Distribution Mounting & Wiring Power and Control WiringInput Power Connections Liebert FDC Distribution MountingElectrical connection location for 23 584mm cabinet FPC15000 Rev FPC15002 Rev Suggested minimum input wire size data Main input circuit breaker interrupting rating Junction Box Installation Main input junction box electrical connections 4 wireLow-voltage control junction box dimensions, typical Main input power junction box dimensions, typicalSystem Grounding Equipment GroundingSignal Reference Grid Grounding Electrode Conductor for FPCs With TransformerMinimum grounding electrode conductor size AWG Output VoltageTypical Liebert FPC With transformer grounding arrangement SystemTypical Liebert FPC without transformer groundingOutput Power Connections Liebert FPC Liebert FPC +24VDCUnit EPO MainWiring Low Voltage Terminal StripFactory Typical control wiring for units with monitoring Optional Customer Alarm Inputs SummaryChecklists WarrantyInternal Inspection StartupTorque specifications, general Panelboard main circuit breaker torque specificationsBranch circuit breaker torque specifications Terminal block compression lug torque specificationsInspection Unit Serial Number Unit Model Number DateStartup Monitoring System Check-Out Customer Alarms Startup Procedures Normal System ShutdownNormal System Turn on Manual RestartPower Monitor Panel Alarm Present/SilenceBasic Monitor Panel Units Without Monitoring FPC16000Operating Instructions Ascii interface default parameters RS-232 Ascii port customer commandsParameter Default Monitored parameters data definitions Field # Data item UnitsInspection and Cleaning RepairInspection Schedule Page Ne t ItiTi n That
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