Fuji Electric FRENIC-HVAC User Manual page 521

Example: With H04 = J195 = 2 (number of times) selected
OC
Output frequency
Maximum
frequency: Fmax
(F03, F15, J118)
Minimum frequency
Fmin (F16, J119)
H05:
J193: Reverse
Retry interval
frequency
H04: number of
0 time (non)
retries (normal)
J195: Number of
0 time (non)
allowed reverse
operations
"TRY"
ON
"ALM"
<J188 = 2 (alarm: filter clogging trouble, inverter stop with FoL trip)>
When the amount of air which passes through the filter decreases due to filter clogging, the
rotation load of the air-cooling fan decreases, causing load resistance current values to
decrease. Contrary, pressure increase is induced before the filter because air does not pass
through smoothly. This characteristic is detected with the condition in (1) or (2) below. When
one of the conditions is satisfied and the load resistance detection timer value (J192) elapses,
the filter clogging prevention function operates.
(1) With load resistance current selected
"Output current ≥ load resistance current (J190)"
(2) With load resistance PV signal selected
"Feedback PV value ≥ load resistance PV signal (J191)"
When the filter clogging prevention function operates, PID control is canceled, and reverse
rotation operation is performed with the reverse rotation operation frequency (J193). (The
number of filter clogging is counted up.)
After reverse rotation operation is started and continued during the reverse rotation operation
time (J194), normal rotation operation (PID control) is restored. When filter clogging is
detected again after the number of reverse rotation operations reaches the number of allowed
reverse operations (J195), alarm stop (FoL trip) is resulted.
<J188 = 3 (While warning (filter clogging trouble) is output, operation is continued.)>
While the detection operation is the same as the one in (2) above, warning is output and
operation is continued (rather than alarm stop) when filter clogging is detected again after the
number of allowed reverse operations (J195) is reached. Operation for the filter clogging
prevention function is performed and reverse rotation operation is continued.
OV
Normal retry
H05
J194:
Clear time elapsed
Reverse
time
Number-of-retry
1 time (once)
1 time (once)
ON
6-211
6.3 Details of Function Codes
OC OC OC
H05 H05 H05
The number of retries is not
counted up even when OCT
occurs during reverse rotation
cleaning
operation
0 time (once)
0 time
1 time (once)
(non)
ON ON ON
OC
J194
0 time
2 time (once)
(non)
ON