5. Operation
75
5.2 Usage According to Purpose (Alarm, Periodic Active Energy, Rolling Demand, Operating
Time, Password, etc.)
Display and operation of digital input/output status
The digital status can be displayed by inputting the switching signal of the breaker and the alarm signal of the over current
relay to the digital input (DI) terminal.
The digital output (DO) terminal opens and closes the contact by communication control.
To display the digital input/output status, the digital input/output status display setting should be configured in advance.
(For setting of the digital input/output display, refer to page 45.)
■
Display examples
These are displayed when the button is pressed repeatedly in the operation mode to switch the measurement displays.
■
Digital input reset method
The method for maintaining the digital input status differs according to the digital input reset method.
Reset method
Cancelation method
Auto reset
(Auto)
If the digital input turns OFF (Open), the digital input status automatically turns OFF
(Open).
Latch
(HoLd)
After it is detected that the digital input is ON (Closed), the digital input status is kept ON
(Closed) until executing latch cancelation, even when the digital point input turns OFF
(Open).
When alarm contact such as ACB are input, alarm generation
status continues on this measurement instrument even when an alarm
generation stops so that an alarm cannot be missed.
■
Digital input conditions
The following are the digital input conditions
.
Input conditions
Terminals DI
Rating
24VDC(19 to 30VDC),7mAor less
ON (Closed)
/ OFF (Open) time
30ms or longer for both ON and OFF
Releasing the digital input latch
Holding down the button for 2 seconds while the digital input display (DI) is displayed releases the digital input
(DI) latches collectively.
The digital input latches can be released also via communication.
Preventing maximum value update by motor starting current
When the motor current is monitored, use the motor starting current delay function to prevent maximum value
update and alarm generation for the current, active power, reactive power,
apparent Power
,and power factor
due to the motor starting current. It is necessary to set in advance to use the motor starting current delay function.
(About settings, refer to page 36.)
■
Movement when the motor starting current delay function is used
Note 1: Set the motor starting current value to a value lower than the lower limit value considering changes in
the load current during operation.
Note 2: When the input current is below the motor starting current value, the minimum value update stops.
DISPLAY
RESET
＜
When the optional plug-in module “ME-0052-SS96” is installed
＞
Digital input display
（
DI1 to DI5
）
Digital output display
（
DO1
、
DO2
）
：
Digital closed
：
Digital opened
Digital input/ output status
<Motor starting current detection>
When the current is over the motor
starting current value, the motor
current starting current delay time
counter begins.
<Motor starting current delay>
The maximum values for the current, active
power,reactive power and power factor are
not updated during the motor,reactive power
and power factor starting current delay time.
Also, no alarm generated even if it is over the
upper limit alarm value.
Motor starting current delay time
Current
Time
Motor starting
current value
Current upper
limit alarm value
Motor starting
current
