MICROENER MM30-DK, Руководство по эксплуатации

Страница: 8 / 36

MM30-DK
Doc. N° MO-0050-ING
Rev. 2
Pag. 8 of 36
Copyright - 2010 - Microener
2.2.3.2
– F51LR – Locked Rotor Protection (Rotor jam)
At motor starting this function is disabled for the set time “
2tSt “
: when this time has elapsed, if
current exceeds the set level “
ILR
”, the relay trips with a delay of “
tLR
” sec.
- Current level :
ILR = (1-5)Im, step 0.1Im. lf ILR = DIS. the function is disactivated.
tLR = (1-25)s, step 1s
- Inhibition time of the locked rotor function :
2tSt
tSt = (1-120)s, step 1s = motor start-up time
2.2.3.2 - F46 - Current Unbalance (Negative Sequence Current) protection (See curve 21)
Besides its contribution to the thermal image algorithm, current unbalance also controls another
inverse time element
-Minimum Negative Sequence current operation level
Is> = (0.1-0.8)Im, step 0.1lm. lf ls> = DIS. the function is disactivated.
- Time current curve
tIs> = (1-8)s, step 1s
Actual trip time delay is given by:
“
Is
” is the actual Negative Sequence Current
2.2.3.4
– F47 – Single Phasing
When the relay detects the loss of the current of one phase while the currents of the other two
phases are present, the Single Phasing element “
1

“ is tripped with a fixed 3 sec. time delay.
2.2.3.5 - F37 - No-Load Running protection
This function performs the protection against no-load running: it is activated by motor under
current.
-
Under current level
I< = (0.15-1)Im, step 0,01Im. lf I< = DIS. the function is disactivated.
When current is below 0.1lm in all phases the function is activated.
-
Trip time delay = 3 sec.
Im) Is at time trip (tIs tIs
0.1 Is/Im
0.9
t
  

