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Smart-UPS® VT ISX w/transformer and PDU, 20-30 kVA, 480 V, Installation
6
Specifications
Minimum breaker settings
Note 1: the short-circuit level is indicated for the output value.
UPS ratings 20 kVA 30 kVA
Input voltage / Bypass voltage (V) per phase 480 480
Input current (nominal) (A) 25.5 36.8
Input frequency (Hz) range 60 60
Output voltage (on line) (Vac)
Minimum and maximum values(± 1%)
3x208/120 3x208/120
Output current (nominal, per phase) (A) 55.5 83.3
Maximum output current (in bypass only at
110% overload per phase)
61.1 91.6
Neutral output current
(with 100% switch mode load) (A)
37.5 56.7
20kVA
Internal
fault
800%
overload
bypass
operation
150%
overload
normal/
battery
operation
125%
overload
normal/
battery
operation
Conti-
nuously
Mains input 4 kA – – – 68 A
Bypass input 2.3 kA 444 A – – 62 A
Duration <10 ms 500 ms 30 s 60 s
Notes 1
30kVA
Internal
fault
800%
overload
bypass
operation
150%
overload
normal/
battery
operation
125%
overload
normal/
battery
operation
Conti-
nuously
Mains input 5 kA – – – 102 A
Bypass input 4.2 kA 444 A – – 92 A
Duration <10 ms 500 ms 30 s 60 s
Notes 1
∞
∞
Recommended phase-conductor sizes [AWG] for
a 86°F (30°C) temperature environment
Recommended current protection
To ensure the correct functionality of the PDU and to avoid unintentional
tripping of the bypass input protection device follow the following
recommendation:
Use the SUVTOPT114 (20 kVA version) or the SUVT115 (30 kVA
version) as input protection.
Output protection is included in the PDU of the unit.
Note: Using a solution solely based on breakers, selectivity for load short
circuit currents higher than 2 kA cannot be assured for the 3-phased
output. If this is required, use fuses to protect the bypass.
UPS/AWG
sizes
AC
input [AWG]
AC
output [AWG]
DC input
[AWG], 75ºC Wire
20 kVA 6 4 4
30 kVA 4 1 1
Note
Use Molex lug type or equivalent, and crimp to
manufacturer’s specifications.
Cable Size
[AWG]
Cable Lug
Type
Crimping
Tool
Die
Terminal Bolt
Diameter
6 YA6CL2TC38 MD7-34R W5CVT 0.2 in/6 mm
4 YA4CL2TC38 MD7-34R W4CVT 0.2 in/6 mm
1 YA1CL2TC38 MD7-34R W1CVT 0.2 in/6 mm
Warnin
g
At 100% non-linear load (EN50091-3 standard), the
neutral shall be rated for 173% phase current.
UPS size Fuse type
20 kVA version 480 V input voltage 40 A Class J time delay fuse
30 kVA version 480 V input voltage 50 A Class J time delay fuse
Smart-UPS® VT ISX w/transformer and PDU, 20-30 kVA, 480 V, Installation
If fuses are preferred, the following can be used:
Ensure that the short-circuit current on the UPS input is less than 14 kAiC
sym RMS. Also take into consideration the below breaker settings to
ensure correct functionality during overload operation.
7
Checklist
• Do not apply electricity to the UPS.
• Do not connect batteries in the UPS.
• If an XR Battery Enclosure is installed make sure that the DC breaker
(if available) is in the OFF position and that both 125A fuses are
removed from the XR Battery Enclosure.
• Check that the power wiring is torqued to 62 lbf
.
in/7 Nm.
• Verify clockwise phase-rotation (L1, L2, L3) and make sure a neutral
connection is present.
• If the installation includes an XR Battery Enclosure, remount the
125A fuses in the XR Battery Enclosure and check that the DC
breaker (if available) on the XR Battery Enclosure is in the ON
position.
• Leave a wiring diagram on site for service personnel.
• Close the rear door.
• For any optional equipment, refer to product-specific manuals.
8
Contact Information
If a problem occurs, phone Customer Support at (1) (800) 800-4272 (US
and Canada). For country-specific centers: go to www.apc.com/support/
contact. Web Support: write to support@apc.com
UPS size Breaker/fuse
20 kVA version 480 V input voltage 40 A
30 kVA version 480 V input voltage 50 A
Note
Breakers/fuses other than APC SUVTOPT need complete
selectivity assessments.