Hitachi L200 Manual Do Utilizador
Using Intelligent Output Terminals
Oper
ations
and Monitor
ing
4–44
Analog Input Disconnect Detect
This feature is useful when the inverter receives a speed reference from an external
device. Upon input signal loss at either the [O] or [OI] terminal, the inverter normally
just decelerates the motor to a stop. However, the inverter can use the intelligent output
terminal [Dc] to signal other machinery that a signal loss has occurred.
device. Upon input signal loss at either the [O] or [OI] terminal, the inverter normally
just decelerates the motor to a stop. However, the inverter can use the intelligent output
terminal [Dc] to signal other machinery that a signal loss has occurred.
Voltage signal loss at [O] terminal - Parameter B082 is the Start Frequency Adjust-
ment. It sets the beginning (minimum) output frequency when the speed reference
source is greater than zero. If the analog input at terminal [O] is less than the Start
Frequency, the inverter turns ON the [Dc] output to indicate a signal loss condition.
ment. It sets the beginning (minimum) output frequency when the speed reference
source is greater than zero. If the analog input at terminal [O] is less than the Start
Frequency, the inverter turns ON the [Dc] output to indicate a signal loss condition.
Current signal loss at [OI] terminal - The [OI] terminal accepts a 4mA to 20mA
signal, with 4mA representing the beginning of the input range. If the input current falls
below 4mA, the inverter applies a threshold to detect signal loss.
signal, with 4mA representing the beginning of the input range. If the input current falls
below 4mA, the inverter applies a threshold to detect signal loss.
Note that a signal loss is not an inverter trip event. When the analog input value is again
above the B082 value, the [Dc] output turns OFF. There is no error condition to clear.
above the B082 value, the [Dc] output turns OFF. There is no error condition to clear.
Option
Code
Terminal
Symbol
Function Name
Output
State
Description
06
Dc
Analog Input
Disconnect Detect
Disconnect Detect
ON
when the [O] input value < B082 Start
Frequency Adjustment (signal loss detected), or
when the [OI input current is less than 4mA
Frequency Adjustment (signal loss detected), or
when the [OI input current is less than 4mA
OFF
when no signal loss is detected
Valid for outputs:
11, 12, AL0 – AL2
Required settings:
A001=01, B082
Notes:
•
•
The [Dc] output can indicate an analog signal
disconnect when the inverter is in Stop Mode, as
well as Run Mode.
disconnect when the inverter is in Stop Mode, as
well as Run Mode.
•
The example circuit for terminal [12] drives a relay
coil. Note the use of a diode to prevent the negative-
going turn-off spike generated by the coil from
damaging the inverter’s output transistor.
coil. Note the use of a diode to prevent the negative-
going turn-off spike generated by the coil from
damaging the inverter’s output transistor.
RY
+
–
–
Example (requires output configuration—
see page
see page
Inverter output
terminal circuit
terminal circuit
Dc
and
AL0
AL2
AL1
Inverter logic
circuit board
circuit board
See I/O specs
on page
on page
Dc
Load
Power
supply
12 11
CM2