Table of Contents
Advertisement
5.
Operation
5.2. Usage Depending on the Application (Alarm, Periodic Active Energy, Rolling Demand,
Operating Time, Password, etc.)
5.2.15. Digital Input/Output Status Display and Action
The contact status can be displayed by signal inputs such as the opening/closing signal of breaker or the alarm
signal of overcurrent relay to the digital input (DI) terminal.
For the digital output (DO) terminal, the contact is open/closed by communication control.
To display the digital input/output status, the setting is necessary.
*For details on the setting, refer to 3.12.
■Display examples
<When ME-0052-SS96 (optional plug-in module) is installed>
Digital input (DI1 to CI5)
In the operating mode, when you are switching the measurement screen with
status is displayed.
■Digital input reset method
The method how to retain the digital input status varies depending on the digital input reset method.
Reset method
Automatic (Auto)
If the
Once the
remains as ON (closed) until the latch is cancelled.
Latch (HoLd)
For example, When an alarm contact such as ACB is input, even if an alarm stops, the instrument
retains the alarm state. Therefore, you will not overlook alarm generating.
■Digital input conditions
The following table shows the digital input conditions.
Input conditions
Switch rating (Contact capacity)
ON (closed)/OFF (open) time
5.2.16. How to Cancel the Latch for Digital Input
On the digital input (DI) display screen, pressing
input (DI) in a batch.
Communication function also enables the cancellation.
5.2.17. How to Prevent Maximum Value Update by Motor Starting Current
For motor current monitoring, using the motor starting current delay function prevents the maximum value
update of current, active power, reactive power, apparent power, power factor, and current unbalance rate and
the alarm generating that are caused by motor starting current. To use the motor starting current delay function,
you must set it. For details on the settings, refer to 3.8.
■The action with motor starting current delay function
<Motor starting
current detection>
When a current value
Current upper
reaches the motor
limit alarm value
starting current threshold
or more, the motor
starting current delay time
is counted.
Motor starting
current threshold
Note1: For the motor starting current threshold, set a value lower than the lower limit value, considering a change in load
current during operation.
Note2: When input current is below the motor starting current threshold, the minimum value update stops.
Digital output (DO1, DO2)
digital
input becomes OFF (open), the
digital
input detects ON (closed), even if it becomes OFF (open), the
24 V DC (19 V DC to 30 V DC), 7 mA or less
Both of ON and OFF: 30 ms or more
Current value
Motor starting current delay time
Motor starting
current
: Digital open
: Digital closed
Digital input/output status
How to cancel
digital
input status will automatically become OFF (open).
DI terminal
for two seconds enables to cancel the latch for digital
RESET
For current, active power, reactive power, apparent
power, power factor, and current unbalance rate, the
maximum values are not updated during the motor
starting current delay time. Even when the upper limit
alarm value is exceeded, an alarm is not generated.
Time
86
, the digital input/output
DISPLAY
digital
<Motor starting current delay>
input status
Advertisement
Table of Contents
