Date: 2021-08-17
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Tutorial: Custom Thresholds
Problem description
Although the CS141 recognizes the UPS correctly, contactors are to be activated via potential-free contacts. This shall switch off
external devices as soon as the charge of the batteries drops below a configured value.
This configuration can be realized indirectly:
If a CON_R_AUX4 is connected to CS141, the potential-free outputs can be used to control the contactors - it is possible to
switch through (ON) and block (OFF). This will allow to implement the control of the contactors without tricky issues.
It will be difficult if the UPS does not offer suitable events:
As a consequence, these events are not displayed inside the
UPS event menu. Using Custom Thresholds will allow this
configuration:
The key to this configuration is the fact this function depicts a
user definable job as a UPS event:
Setting 71% for Warning Levels and 61% for Alarm Levels, you
can subsequently assign appropriate behaviour in the UPS
events:
-
if the battery charge drops to 70%, the first devices
are switched off.
-
If the battery charge drops to 60%, the next devices
are turned off. The counter events are set to Warning
OFF or Alarm Off.
As the batteries are charging, the devices should start after
battery charge reaches similar values for shutdown.
-
From 61% the first device list will be switched on
-
From 71% the second device list will be switched on.
Since there is no AND connection to the Power Fail, there are
basically two possibilities to run these jobs:
1. Once
2. Repeat as lob as the event is active
Note you have a difference of 1% between ON and OFF. Due to the fact the value needs to drop below the values, it is
technically not possible to switch exactly ON and OFF at 70% or 60%. A decision is needed whether you wish to switch ON the
devices at 60/70% or off
You need to define your jobs exactly
:
Turning off the same devices 70% and to on position at 61% could cause conflicts between events and jobs, devices should
therefore be consistently configured separately
What will happen between 0%
– 71%
Depending on the configuration, independent to any power fail the devices will stay off, shutdown or restart between 0% and
71% battery charge. Above 71% the devices will run as long as no power fail will cause the battery charge to drop at 70%. Since
the current load has no influence on the percentage of battery load, the flexible remaining time does not affect this setting. The
percentages of the current battery charge are basically used.
Note:
A detailed description of the CON_R_AUX4 can be found at chapter
Sensors
