Hitachi WJ Series

Chapter 9 Inverter Functions
9-13-2
9.13.2 Outputting a Signal When the Output Frequency Exceeds the Set Value
 How to detect and tell the system that the output frequency to the motor has reached or
exceeded the set value?
 Assigning "Set frequency overreached [FA2] (02)"/"Set frequency overreached 2 [FA4] (24)" to
one of the output terminal functions ([C021]/[C022]/[C026]) enables the inverter to output
command frequency arrival signals.
 Two independent set frequency overreached signals [FA2] and [FA4] can be assigned to the
output terminals.
 The frequency setting for turning [FA2] on during acceleration and off during deceleration is set
by "Arrival frequency during acceleration [C042]"/"Arrival frequency during deceleration
[C043]", respectively. Similarly, set "Arrival frequency 2 during acceleration [C045]"/"Arrival
frequency 2 during deceleration [C046]" for [FA4].
Code
Item
Description
Data
[C042]
Arrival frequency
during acceleration
During acceleration, [FA2] turns on when the
output frequency exceeds this set value.
0.00 to 590.00 (Hz)
[C043]
Arrival frequency
during deceleration
During deceleration, [FA2] turns off when the
output frequency falls below this set value.
0.00 to 590.00 (Hz)
[C045]
Arrival frequency 2
during acceleration
During acceleration, [FA4] turns on when the
output frequency exceeds this set value.
0.00 to 590.00 (Hz)
[C046]
Arrival frequency 2
during deceleration
During deceleration, [FA4] turns off when the
output frequency falls below this set value.
0.00 to 590.00 (Hz)
[C021]
[C022]
[C026]
Output terminal
function
Set frequency overreached [FA2]:
This signal turns on when the output frequency
exceeds the [C042]/[C043] set values.
02
Set frequency overreached 2 [FA4]:
This signal turns on when the output frequency
exceeds the [C045]/[C046] set values.
24
fon: 1% of the maximum frequency
foff: 2% of the maximum frequency
[C042]
[C043]
fon
foff
Output
frequency
[FA2] Output
foff
fon
[C045]
[C046]
[FA4] Output
(Example of operation)
When the maximum frequency is 60 Hz,
and [C042] = [C043] = 50 Hz
- fon = 60 × 0.01 = 0.6 Hz
- foff = 60 × 0.02 = 1.2 Hz
- During acceleration:
On at 50 - 0.6 = 49.4 Hz
- During deceleration:
Off at 50 - 1.2 = 48.8 Hz
ON
ON
Q
A
!