Specifications 5
© 2017 Geist
GM1107 - ATS User Guide
2 Installation
2.1 Instructions
1. Using appropriate hardware, mount PDU to rack (see Mounting section for
additional instructions).
2. Plug PDU into de-energized, Phase Synchronized branch circuit receptacles.
3. Connect devices into PDU’s output receptacles. It is recommended that the
devices are turned off until all devices are connected to PDU
4. Turn on branch circuit for Source A to energize PDU.
5. Turn on branch circuit for Source B.
6. Power on devices. Sequential power up is recommended to avoid high inrush
current.
2.2 Guidelines
Warning: Source power must be Phase Synchronized, high voltage potential may
result in relay failure when sources are not Phase Synchronized.
Some loads may pull high inrush current when switching power sources. Do not
overload ATS to prevent relay failure and tripping branch circuit protection.
If the PDU is installed in a cabinet the ambient temperature of the rack should be
no greater than 45 C.
Install the PDU such that the amount of airflow required for safe operation of
equipment is not compromised.
Mount the PDU so that a hazardous condition is not achieved due to uneven
mechanical loading.
Follow nameplate ratings when connecting equipment to the branch circuit. Take
into consideration the effect that overloading of the circuits might have on over-
current protection and supply wiring.
The PDU relies on the building installation for protection from over-current
conditions. A certified overcurrent protection device is required in the building
installation. The overcurrent protection device should be sized according to the
PDU’s nameplate ratings and local/national electrical codes.
Reliable earthing of rack-mount equipment should be maintained. Particular
attention should be given to supply connections other than direct connections to
the branch circuit. The PDU must be connected to an earthed socket-outlet.
The PDU is intended for Restricted Access Locations only and only qualified service
personnel should install and access the PDU.
For pluggable equipment, install the PDU so that the input plug or appliance
coupler may be disconnected for service.
Sequential power-up of devices powered by the PDU is recommended to avoid
high inrush current.
Caution: Disconnect all power cords before servicing.
The PDU is intended for use with TN or TT power supply systems
