User manual

16 GMC-I Messtechnik GmbH
3 Controls, Display Elements and Terminals
Note: Numbers in brackets make reference to the figures included below.
[1] Mains Switch <POWER>
For turning the KONSTANTER on and off
After switching the KONSTANTER on, a self-test is performed
with a duration of approximately 8 seconds. After successful
completion of the self-test, the KONSTANTER briefly displays
its interface address and the version number of the installed
firmware, one after the other. The POWER-ON function then
configures the device with predetermined settings and the
device is ready for use.
When the KONSTANTER is switched off, it is disconnected from
mains power and the output is immediately deactivated. The last
device configuration, as well as any settings which have been
saved to battery-backed setup memory, are retained.
[2] Output On-Off Key <OUTPUT>
The power output can be activated and deactivated by
pressing the <OUTPUT> key. The red LED above the <OUTPUT>
key is illuminated as long as the output is active.
No significant output voltage overshooting occurs when the
output is activated and deactivated.
Activation sequence:
If the power output is activated, current and voltage are initially
set to “0” for transition from the “highly resistive” state.
Setpoints do not become active until after this transition has
been completed.
Deactivation sequence:
Current is set to 0 A and voltage to 0 V for approximately
350 ms. A sink is thus activated which discharges the output
capacitors to the greatest possible extent. The sink is then
deactivated and the output becomes highly resistive. However,
the output terminals are not electrically isolated.
[3] Control Mode, Protective Function and Status Displays
No LEDs light up: Output has not been activated
LEDs lights up:
Indicates the output’s operating status (control mode) if it has
been activated:
Green CV LED Constant voltage regulation (Uout = Uset)
Green CC LED Constant current regulation (Iout = Iset)
Blinking LED:
Indicates the reason for automatic deactivation of the output
Green CV LED OVP (overvoltage protection)
Overvoltage protection has been triggered,
because output voltage has exceeded the
selected trigger value OVP / OVSET.
Possible causes:
☞ Voltage setpoint USET has been set too high manually,
memory recall, programming error or Uset control signal to
the analog interface
☞ Voltage transients caused, for example, by switching
inductive power consumers (perhaps too little difference
between selected USET and OVSET values)
☞ Unipolar power recovery from the connected consumer
(e.g. DC motor)
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