© EA Elektro-Automatik in 2022, this information is subject to change without notice
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06230920_manual_ps_10000_3u_15kw_en_01
3.
Operation and application
3.1
Personal safety
•
In order to guarantee safety when using the device, it’s essential that only persons operate the device
who are fully acquainted and trained in the required safety measures to be taken when working with
dangerous electrical voltages
•
For models which can generate a voltage which is dangerous by contact, or is connected to such, the
included DC terminal cover, or an equivalent, must always be used
•
Whenever the load and DC output are being re-configured, the device should be disconnected from the
mains, not only the DC output switched off!
3.2
Operating modes
A power supply is internally controlled by different control circuits, which shall regulate voltage, current and power to the ad-
justed values and hold them constant, if possible. These circuits follow typical laws of control systems engineering, resulting
in different operating modes. Each operating mode has its own characteristics which are explained below in short form.
•
Unloaded operation isn’t considered as a normal operation mode and can thus lead to false measure-
ments, for example when calibrating the device
•
The optimal working point of the device is between 50% and 100% voltage and current
•
It’s recommended to not run the device below 10% voltage and current, in order to meet technical
values like ripple or transient times
3.2.1
Voltage regulation / Constant voltage
Voltage regulation is also called constant voltage operation (CV).
The DC output voltage of a power supply is held constant on the adjusted value, unless the output current or the output power
according to P = U
OUT
* I
OUT
reaches the adjusted current or power limit. In both cases the device will automatically change to
constant current or constant power operation, whatever occurs first. Then the output voltage can’t be held constant anymore
and will sink to a value resulting from Ohm’s law.
While the DC output is switched on and constant voltage mode is active, then the condition “CV mode active” will be indicated
on the graphic display by the abbreviation
CV
and this message will be passed as a signal to the analog interface, as well
stored as status which can also be read as a status message via digital interface.
3.2.1.1
Voltage regulation peaks
When working in constant voltage regulation (CV), the device’s internal voltage regulator requires a small transient time to
settle the voltage after a load step. Negative load steps, i.e. high load to lower load, will cause the output voltage to overshoot
for a short time until compensated by the voltage regulator. The time is takes to settle the voltage can be influenced by
switching the voltage regulation speed between the settings
Slow
,
Normal
and
Fast
, whereas Normal is the default. Setting
Slow
will result in a higher transient time and higher voltage drop, but less overshooting, while
Fast
is vice versa. Also see
“3.4.3.1. Sub menu “Settings”“.
Depictions:
Example for a neg. load step: the DC output will rise above
the adjusted value for a short time. t = transient time to
settle the output voltage.
Example for a pos. load step: the DC output will collapse
below the adjusted value for a short time. t = transient time
to settle the output voltage.
