Operation
GUPS 2400A
–104 Operation Manual
3-3
3.3
Circuit Breakers
AC INPUT
The AC input breaker is located on the front panel below the Control and Indicator Panel.
It is turned ON by pushing in the actuator button, and it is turned OFF by pulling out the actuator
button.
AC OUTPUT
Two circuit breakers are present on the rear panel: one rated at 10A for protecting one set of
three AC output connectors; another rated at 15A for protecting the other set of three AC output
connectors. They are turned ON by pushing in the actuator buttons, and they are turned OFF by
pulling out the actuator buttons.
3.4
Audible Alarm
An audible alarm is sounded for the following alarm conditions: loss of AC input; low battery
voltage; over-temperature. If the audible alarm is silenced and an alarm condition is again
present, the audible alarm will again be sounded.
3.5
Control Signals
The Data/Alarm Port provides an interface to remote alarms or a host computer. The control
signals provide annunciation of the mode of operation, control of the system shutdown, and RS-
232 data communications. The control signals of the Data/Alarm Port and their signal return
could be floated up to 80VPK above chassis ground.
AC FAIL
Normally-open relay contacts that close when the AC input is outside the allowed range for
voltage or phase unbalance.
LOW BATTERY
Normally-open relay contacts that close when the battery voltage approaches the shutdown
threshold for the inverter.
SHUTDOWN
Input to a relay coil whose contacts interface with the control circuits of the GUPS. Energizing
the relay with a DC voltage, 16.8-36VDC (1,070 ±10% coil resistance), will result in shutdown.
If SHUTDOWN is asserted while the AC input is present, the output relay will open and output
power will be turned off; the inverter and control circuits will continue to operate.
If SHUTDOWN is asserted while the AC input is not present and the inverter is running from the
battery, the output relay will open and output power will be turned off; the inverter and control
circuits will be shut down also. After shutdown, the OUTPUT ON switch must be manually
toggled to turn the output back on.
RS-232 TRANSMIT/RECEIVE
RS-232 transmit and receive for data communications. Refer to Section 3.9 for more information
on RS-232 interface.
Summary of Contents for GUPS 2400A-104
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