IDEC FL1E SmartRelay - Manual (Page 180)

IDEC SmartRelay functions
166 IDEC SmartRelay Manual 
Functional description
The operating hours counter monitors input En. When En =
1, IDEC SmartRelay computes the time expired and the
time-to-go MN. IDEC SmartRelay shows these times in
parameter assignment mode. Output Q is set when the time-
to-go MN = 0.
A signal at reset input R resets output Q and sets the preset
value of MI at the counter for the duration of MN. The
operating hours counter OT is not affected.
With a signal at the reset input Ral, you reset output Q and
set the preset value of MI at the counter for the duration of
MN. The operating hours counter OT is reset to zero.
Depending on your configuration of parameter Q, the output
is either reset with a signal at input 
R or Ral (”Q 0:R”), or when a reset signal is set hi, or the
En signal is set lo (”Q 0:R+En”).
Viewing the MI, MN and OT values
In WindLGC you can fetch the hours counter via the "Tools 
-> Transfer: Hours counter" menu command.
Limit value of OT
The value of the operating hours in OT are retained when
you reset the hours counter with a signal at input R. The
hours counter OT will be reset to zero with a transition from
0 to 1 at Ral. The hours counter OT continues the count as
long as En = 1, irrespective of the status at the reset input R.
The counter limit of OT is 99999 h. The hours counter stops
when it reaches this value.
In programming mode, you can set the initial value of OT.
MN is calculated according to the following formula when
reset input R never enabled: MN = MI - (OT % MI).
Example:
0
Hours
20 40 60 80 100 120
MN
OT
30h 30h 30h 30h
20h 100h
MI
MI = 30h, OT = 100h
MN = 30 - (100 % 30)
MN = 30 -10
MN = 20h
In runtime mode, the value OT can not be preset. If the value
for MI is changed, there would be no calculation for the MN.
MN will take on the value of MI.