Operating Instructions

Chapter 2—Hardware Features
PX Series Enclosures and Service Boxes
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60
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Siemens Industry, Inc.
Owner's Manual
588-781
Building Technologies
2018-10-01
PX Series Service Box Specifications
Power Requirements for 115 Vac Service
Boxes
PXA-SB115V192VA
Input: 115 Vac +/- 15%, 50/60 Hz +/- 5%, 220VA maximum, 2A CB
Output: 24 Vac +/- 20%, 50/60 Hz +/- 5%, 192VA maximum
PXA-SB115V384VA
Input: 115 Vac +/- 15%, 50/60 Hz +/-
5%, 440VA maximum, 4A CB
Output: 24 Vac +/- 20%, 50/60 Hz +/- 5%, 384VA maximum
115 Vac models also have a duplex outlet, which is protected by Mains 20A or 15A CB for use
internal to enclosure to power laptop and peripheral devices.
Power Requirements for 230 Vac Service
Boxes
PXA-SB230V192VA
Input: 230 Vac +/- 15%, 50/60 Hz +/- 5%, 220VA maximum, 1A CB
Output: 24 Vac +/- 20%, 50/60 Hz +/- 5%, 192VA maximum
PXA-SB230V384VA
Input: 230 Vac +/- 15%, 50/60 Hz +/- 5%, 440VA maximum, 2A CB
Output: 24 Vac +/- 20%, 50/60 Hz +/- 5%, 384VA maximum
Service Box Output Jacks
One 3-terminal and one 2-terminal NEC Class 1 output jack
for use internal to enclosure to power system components.
One 2-
terminal NEC Class 2 output jack with 4A CB
for use external to enclosure to power actuators.
PX Series Enclosure Placement
CAUTION
Do not mount the enclosure on ductwork, HVAC components, or any other vibrating
surface.
● Mount the enclosure at least 12 feet (3.7 m) away from devices that can generate
Radio Frequency Interference (RFI), such as Electro-pneumatic devices (EPs),
relays, and walkie-talkies.
● Mount the enclosure at least 5 feet (1.5 m) away from 100 kVa or larger motors
and variable frequency drives (VFD).
CAUTION
If the enclosure is mounted under a wire trough or any other obstruction, provide a
minimum vertical cle
arance of 2 inches (50.8 mm) to allow for installation and removal
of the enclosure door.