LEGRAND 1U, Руководство пользователя

Страница: 238 / 543

Janu
ary 201
9
238 Legrand PDU User Guide
Example 3
This example illustrates a situation where two event rules combined regarding the outlet state changes
causes the Legrand PDU to continuously power cycle outlets 1 and 2 in turn.
Event selected Action included
Outlet > Outlet 1 > Sensor > Outlet
State > On/Off > Both (trigger
condition) Cycle Outlet 2
(Switch outlets --> Cycle Outlet -->
Outlet 2)
Outlet > Outlet 2 > Sensor > Outlet
State > On/Off > Both (trigger
condition) Cycle Outlet 1
(Switch outlets --> Cycle Outlet -->
Outlet 1)
A Note about Untriggered Rules
In some cases, a measurement exceeds a threshold causing the Legrand PDU to generate an alert. The
measurement then returns to a value within the threshold, but the Legrand PDU does not generate an alert
message for the Deassertion event. Such scenarios can occur due to the hysteresis tracking the Legrand
PDU uses. See
"To De-assert" and Deassertion Hysteresis
(on page 513).
Setting Data Logging
The Legrand PDU can store 120 measurements for each sensor in a memory buffer. This memory buffer is
known as the data log. Sensor readings in the data log can be retrieved using SNMP.
You can configure how often measurements are written into the data log using the Measurements Per Log
Entry field. Since the Legrand PDU internal sensors are measured every second, specifying a value of 60,
for example, would cause measurements to be written to the data log once every minute. Since there are
120 measurements of storage per sensor, specifying a value of 60 means the log can store the last two
hours of measurements before the oldest one in the log gets overwritten.
Whenever measurements are written to the log, three values for each sensor are written: the average,
minimum and maximum values. For example, if measurements are written every minute, the average of all
measurements that occurred during the preceding 60 seconds along with the minimum and maximum
measurement values are written to the log.
Note: The Legrand PDU device's SNMP agent must be enabled for this feature to work. See Enabling and
Configuring SNMP (on page 288). In addition, using an NTP time server ensures accurately time-stamped
measurements.
By default, data logging is enabled. You must have the "Administrator Privileges" or "Change Pdu, Inlet,
Outlet & Overcurrent Protector Configuration" permissions to change the setting.

To configure the data logging feature:
1. Choose Device Settings > Data Logging.
2. To enable the data logging feature, select the "Enable" checkbox in the General Settings section.
3. Type a number in the Measurements Per Log Entry field. Valid range is from 1 to 600. The default is 60.
4. Verify that all sensor logging is enabled. If not, click Enable All at the bottom of the page to have all
sensors selected.
 You can also click the topmost checkbox labeled "Logging Enabled" in the header row of each
section to select all sensors of the same type.
 If any section's number of sensors exceeds 35, the remaining sensors are listed on next page(s). If
so, a pagination bar similar to the following diagram displays in this section, which you can click any
button to switch between pages.
5. Click Save. This button is located at the bottom of the page.