Strange bug.
UPS package is installed.
There is “system-ups” in Winbox but there is NO “system ups” in the console.
This strange thing in all my mikrotik based hardware 
is this a bug in 6.28??
[admin@MikroTik] > system ups
bad command name ups (line 1 column 
[admin@MikroTik] /system>?
.. – go up to root
backup – Makes a full system backup
check-installation – Check installed packages
clock – Print/change system date and time
console – Connection over serial port
default-configuration –
health – Router health
history – Command history
identity – System identity
leds –
license – Licensing information
logging – Global logging configuration
note – Login note
ntp –
package – Software packages
reboot – Restart the router
reset-configuration –
resource – System resources
routerboard – Routerboard options
scheduler – Schedule scripts to be run at times
script – Scripting management
serial-terminal – Serial Terminal
shutdown – Shut the router down
ssh –
sup-output – Create support output file
telnet – Run Telnet
upgrade – Router upgrading
watchdog – Watchdog
export – Print or save an export script that can be used to restore configuration