User manual
GMC-I Messtechnik GmbH 23
4.3 Switching the Power Output On and Off
The <OUTPUT> key [7] (chapter 3 ) functions independently of the
current operating state of the KONSTANTER.
Further details regarding how the device reacts when the
<OUTPUT> key [7] is activated are included in chapter 3.
Closed Loop Control Mode
The power output can be activated or deactivated by pressing the
<OUTPUT> key [7].
OUTPUT OFF OUTPUT ON
REMOTE status (remote control)
(chapter 3 [25], page 69)
The <OUTPUT> key is disabled and has no function.
LOCAL LOCKED status (front panel controls disabled)
(chapter 3 [17], chapter 4.12)
The <OUTPUT> key is disabled and has no function.
trG out (T_MODE OUT) and External Trigger Active
The output can be activated and deactivated with the trigger
signal (trG parameter OUT selected).
If the power output has been disabled by applying an external
trigger signal to the analog interface, it cannot be switched on,
neither by means of a command nor with the keys. The
corresponding command is not executed, and bit 4 in event
register B is set (output-on error). “Err 25” also appears briefly
at the display as a warning in the event of manual operation.
The status of the power output
(chapter 3 [33]) is indicated by
the red LED above the <OUTPUT> key:
LED on = output activated
LED off = output deactivated
In the case of OUTPUT OFF, the control mode displays are also
switched off (chapter 3 [6]).
If the output has be deactivated as a result of overtemperature
protection, the red OTP LED [17] in the control mode display
lights up. The output cannot be activated until the
KONSTANTER has returned to its normal operating
temperature.
If the Pon RCL function is active, the output is automatically
reactivated after the device has returned to its normal
operating temperature.
Functions which may influence the status of the output
include:
4.4 Limiting the Allowable Working Range: Ulim, Ilim
Allowable setting ranges for voltage and current can be limited in
order to assure ideal matching to the working ranges of the
connected power consumer. The Ulim and Ilim setting functions
are provided to this end.
Setting options can be selected with the respective <SELECT>
key. Setting resolution is selected with the <RESOL> key. The
setting itself is entered with the arrow keys. New settings become
immediately active.
Attention!
These settings represent so-called soft limits. This means that
values which lie within these limits can be selected both manually
and via the computer interface, and that a corresponding error
message is otherwise generated.
Attention!
The actual output quantity is the sum of the digitally selected
setpoint value and the setpoint value specified via the analog
interface. This makes it possible to select values which exceed
the specified soft limit.
Ulim – Setting the Upper Voltage Limit Value
Function
• Upper setting limit (soft limit) for Uset
• Prevents inadvertent violation of the maximum voltage value
when adjusting Uset.
• Protection for the connected power consumer
• Ulim has higher priority than Uset.
• Manual and computer-aided settings for Uset may not exceed
Ulim.
• Ulim cannot be set to a value which is less than a previously
selected Uset value. Uset must be reduced far enough to allow
for the new Ulim setting.
Settings
The setting procedure is described in chapter 4.8.1.
Ilim – Setting the Upper Current Limit Value
Function
• Upper setting limit (soft limit) for Iset
• Prevents inadvertent violation of the maximum current value
when adjusting Iset.
• Protection for the connected power consumer
• Ilim has higher priority than Iset.
• Manual and computer-aided settings for Iset may not exceed
Ilim.
• Ilim cannot be set to a value which is less than current
setpoint Iset. Iset must be reduced far enough to allow for the
new Ilim setting.
Settings
The setting procedure is described in chapter 4.8.1.
Functions Meaning Manual
Operation
Remote
Operation
OVP (OVSEt) Overvoltage
protection
page 24 page 69
OCP Overcurrent
protection
page 26 page 68
Pon (POWER_ON) page 27 page 70
SEq Sequence chapter
4.7.3
page 71
trG (T_MODE) page 29 page 74