53
User Manual 10H52258UM60 - Rev. 3 - 01/2019
Introducing UPS Operations
APM 400/600
The UPS can be set-up in frequency converter mode in order to supply a stable output frequency of either 50Hz
or 60Hz at input frequencies varying between 40Hz and 70Hz. When in this mode, opening the maintenance
bypass switch to disable the static bypass operation, followed by the battery becomes optional depending on the
requirement to operate in battery mode.
Dormancy mode
Dormancy mode is designed to maximize the number of the dormant power modules while ensuring load power,
thereby streamlining the system efficiency significantly. Dormancy mode is configured by a Vertiv commissioning
engineer using the background software.
This mode has the following restrictions on the power module addresses: When there are 'n' power modules, the
power module addresses should be 1, 2, 3, 4 and 'n' in turn; when there are 12 power modules, the power module
addresses should be from 1 to 12.
Note
Sudden load changes should be avoided when in dormancy mode, since they may cause the UPS transfer to the
bypass mode.
LBS mode
A dual bus system consists of two independent UPS systems, each containing one or more UPS modules in
parallel. The dual bus system provides ultra-high reliability and is ideally suited to loads with multiple inputs. In
the case of single-input loads, they may be supplied via an STS unit. For a diagram illustrating the LBS mode
operating principle, see Chapter 8, which includes all the relevant information regarding the LBS system.
Common battery mode
In Common Battery mode, UPS modules that are connected in parallel share the same battery string in order to
reduce costs, save space and improve efficiency.
Note
All batteries used in the same system must be identical (same manufacturer, same model, same age).
6.1
Precautions and Safety measures
This section describes the precautions and safety measures that personnel handing the UPS must adhere to in
order to prevent injury, fatality and equipment damage.
Warning
•
The system may only be operated after the authorized and trained personnel have carried out the
commissioning process. Once the start-up tests have been conducted and the authorized engineer gives the
go-ahead, the system is ready for use.
•
There are no serviceable parts behind the covers that require the use of a tool for removal. Only trained and
authorized personnel may remove any of the covers.
•
Hazardous voltages may be present on the UPS AC input and output terminals at any time. Hazardous
voltages may be present in cabinets fitted with EMC filters.
Note
•
For information on the control and menu keys, refer to Chapter 5 - Operation Control and Display Panel.
•
The buzzer alarm may be activated at any moment while the UPS is in operation. To silence the alarm, press
the Silence ON/OFF button.
•
In the case of lead-acid batteries, the system also includes an optional boost charge function. When this
option is installed, when the mains supply returns within the normal operating limits following a mains failure, the
battery charging voltage will be greater than the normal charging voltage. This situation is common place if a
lead-acid battery is used, and the battery charging voltage will revert to the normal level after a few hours of
charging.
Warning: hazardous mains and battery voltage present behind covers
