1
I
MPORTANT
S
AFETY
I
NSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during the installation and
maintenance of the Liebert Static Transfer Switch 2 Power Distribution Unit (STS2/PDU).
Read this manual thoroughly, paying special attention to the sections that apply to your installation,
before working with the Static Transfer Switch 2 Power Distribution Unit. Retain this manual for use
by installing personnel.
Refer to
1.2.1 - Handling Considerations
before attempting to move the unit.
Liebert Corporation neither recommends nor knowingly sells this product for use with life support or
other FDA-designated “critical” devices.
The Static Transfer Switch 2 Power Distribution Unit is suitable for indoor use only. Protect the unit
from excessive moisture and install the unit in an area free from flammable liquids, gases and corro-
sive substances.
The unit is designed to operate from solidly grounded AC power sources only. Provide input over-cur-
rent protection in accordance with the unit ratings. Wire and ground the unit according to national
and local electrical safety codes. All wiring should be installed by a qualified electrician.
!
WARNING
The unit is supplied by more than one power source. The unit contains hazardous voltages if
any of the input sources are on, even when the unit is in bypass. To isolate the unit, turn off
and lock out all input power sources.
Verify that all input power sources are de-energized and locked out before making connections
inside unit.
Lethal voltages exist inside the unit during normal operation. Only qualified service
personnel should perform maintenance on the STS2/PDU.
NOTE
Read the entire manual before installing or operating the system. Adhere to all operating
instructions and warnings on the unit and in this manual.
!
WARNING
Under typical operation and with all STS2/PDU doors closed, only normal safety precautions
are necessary. The area around the STS2/PDU should be kept free of puddles of water, excess
moisture and debris.
ONLY qualified service personnel should perform maintenance on the Static Transfer
Switch 2 Power Distribution Unit. When performing maintenance on any part of the
equipment under power, service personnel and test equipment should be located on rubber
mats. The service personnel should wear insulating shoes for isolation from direct contact
with the floor.
One person should never work alone, even if all power is removed from the equipment. A
second person should be standing by to assist and summon help in case an accident should
occur.
!
WARNING
The input sources to the STS2/PDU must be grounded-wye sources. Input sources other than
solidly grounded-wye sources may cause damage to the switch.
Summary of Contents for PDUTM
Page 25: ...Installation Drawings 17 7 0 INSTALLATION DRAWINGS Figure 7 Outline drawing 250A STS2 PDU ...
Page 42: ...Installation Drawings 34 Figure 24 Electrical field connections 250A STS2 PDU input with CB3 ...
Page 46: ...Installation Drawings 38 Figure 28 Electrical field connections 800A STS2 PDU input with CB3 ...
Page 63: ...Installation Drawings 55 Figure 45 Control wiring 800A STS2 PDU left side distribution ...
Page 64: ...Installation Drawings 56 Figure 46 Control wiring 800A STS2 PDU right side distribution ...
Page 65: ...Installation Drawings 57 Figure 47 Control connection location 250A STS2 PDU ...
Page 66: ...Installation Drawings 58 Figure 48 Control connection location 400 800A STS2 PDU ...
Page 68: ...Installation Drawings 60 Figure 50 Control wiring for the programmable relay board option ...
Page 69: ...Installation Drawings 61 Figure 51 Control wiring for the input contact isolator board option ...
Page 70: ...Installation Drawings 62 Figure 52 Control wiring for comms board ...
Page 71: ...Installation Drawings 63 Figure 53 Control wiring for the internal modem option ...
Page 72: ...Installation Drawings 64 Figure 54 Control wiring for the Network Interface Card NIC option ...
Page 73: ...Installation Drawings 65 Figure 55 Control wiring for the RS 232 Port ...
Page 74: ...Installation Drawings 66 Figure 56 Control wiring for remote source selection option ...
Page 75: ...Installation Drawings 67 Figure 57 Color LCD touch screen display ...
Page 155: ......