Emerson Liebert APS - REPO (Remote Emergency Power Off)

Installation
Liebert
®
APS
™
32
2.5.3 Transformer-Free UPS—Dual Inverter Frames
A junction box is factory-installed on all models of the Liebert APS to ease cable connection.
Select the appropriate input cables according to Tables 9 and 10 based on the UPS rating and mains
frequency. Emerson recommends sizing the overcurrent protection and wiring for the frame rating for
easing upgrades to the UPS system.
To connect the cable:
1. Remove the knockouts at the junction box (see Figure 31) and pull the cables through them,
leaving some slack for installation.
Figure 39 Knockouts
2. Connect the cables to the corresponding terminal of the power input and output terminals.
3. Tighten the screws to 4.52Nm (40 in-lb) with a 13mm (1/2 in) torque wrench.
Table 9 Input cable selection for Transformer-free Dual Inverter frames(50/60 Hz)
Maximum
System Rated
Load
Input Voltage – 200/100VAC Input Voltage – 208/120VAC Input Voltage – 240/120VAC
Maximum
Current in
UPS Mode
Recommended
Input Protection
Circuit Breaker
Maximum
Current in
UPS Mode
Recommended
Input Protection
Circuit Breaker
Maximum
Current in
UPS Mode
Recommended
Input Protection
Circuit Breaker
5kVA 28A 50A 27A 50A 27A 50A
10kVA 56A 70A 54A 70A 54A 70A
15kVA 84A 100A 80A 100A 80A 100A
20kVA 112A 125A 107A 125A 107A 125A
The power input and output terminals accept a maximum cable cross-sectional area of 35mm
2
(2AWG); the minimum cable
cross-sectional area is 16mm
2
(6AWG); and the rated torque is 4.52Nm (40 in-lb);.
90°C copper wire is recommended.
Table 10 Input cable selection for Transformer-free Dual Inverter frames(50/60 Hz)
Maximum
System Rated
Load
Input Voltage – 220/110VAC Input Voltage – 230/115VAC Input Voltage – 220/127VAC
Maximum
Current in
UPS Mode
Recommended
Input Protection
Circuit Breaker
Maximum
Current in
UPS Mode
Recommended
Input Protection
Circuit Breaker
Maximum
Current in
UPS Mode
Recommended
Input Protection
Circuit Breaker
5kVA 28A 63A 28A 63A 27A 50A
10kVA 56A 63A 56A 63A 54A 70A
15kVA 84A 100A 84A 100A 80A 100A
20kVA 112A 125A 112A 125A 107A 125A
The power input and output terminals accept a maximum cable cross-sectional area of 35mm
2
(2AWG); the minimum cable
cross-sectional area is 16mm
2
(6AWG); and the rated torque is 4.52Nm (40 in-lb);
90°C copper wire is recommended.
NOTE
Input and output cables must be run in separate conduit before cable connection.
Output Cable
Knockout
Input Cable
Knockout