25
SySTEM DESCrIPTION
2.3.6 The technical data for the KEB Micro-UPS:
Energy storage
4 super-capacitors 28F 2.7V connected in series.
Charging time
30s
Typical operating time
Between 500ms and 1s
Maintenance
None
Installation
Built-in electronics and super-capacitors
Remote mounting for the battery pack NO
Local memory directly managed by
the power supply
Not volatile 256 kB MRAM for CONTROL PLC retain feature; real
available memory 128 kB for RETAIN s 128 kB for PERSIS-
TENT segment
Supported OS
Win32/64., Windows Embedded standard 7
System’s actions taken when in UN-
DER_VOLTAGE
USB power supply is switched OFF
Handling of retentive data in KEB
CONTROL runtime implementation
When receiving the UNDER_VOLTAGE signal the CPU starts a 20ms
timer. When the timer is elapsed the system checks again the UN-
DER_VOLTAGE. If the signal is still active the system checks for the
MICRO_UPS_VCAP_OK. If this signal is high the super-capacitors
are ready and the peripherals are switched off (see previous point).
The memory data block (128KB) is copied the MRAM memory.
In case the super-capacitors are not ready, no data is saved to avoid
possible data corruption. The data saving process can be es-timated
never exceeding 250ms at maximum.
After the data copy has been completed if the UNDER_VOLTAGE
signal is still active the system is turned off; if the UNDER_VOLTAGE
signal is OFF the system is restarted automatically.
In case of a shutdown command the data is saved and the system
turned off. Note: Sleep mode is not supported.
User’s application compatibility
YES, applications can subscribe μUPS “power-down event” form
μUPS APIs.
Note: no shutdown command is sent to the OS, hence no files nor
databases can be automatically closed without proper handling of
the event.
Note: If KEB CONTROL has to manage retain variables the user’s
“event-application” must work on a priority level greater than 10.
Note: please contact KEB support for further details about APIs avai-
lability and use.
Software utility
Micro UPS diagnostic utility (available on request).
Table 1:
Micro UPS data
