User manual

50 GMC-I Messtechnik GmbH
OVSET, OVSET? – Overvoltage Protection Trigger Value
SELECT A and Menu
Function
The triggering threshold reference value required for the OVP
function is set with OVSET.
Setting Command
Syntax: OVSET w
Value range: OVSETmin  w  OVSETmax
Default setting
or after RESET (*RST): OVSETmax
Query Command
Syntax: OVSET?
Sample response string: OVSET +080.000
Parameters List
Comments
Amongst other causes, overvoltage protection can be triggered
by:
–USET  OVSET (due to manual setting, programming
command, memory recall, sequence run or Uset control signal
to the analog interface)
– Sensing leads with reversed polarity
– Interrupted output lead during sensing mode operation
– Interference from the power consumer
– Parallel connected voltage sources
– Dynamic output voltage overshooting
– Device malfunction or defect
POUT? – Querying Momentary Output Power
SELECT B and Menu
Function
The POUT? function reads out momentary output power as the
product of output voltage and output current.
Query Command
Syntax: POUT?
Sample response string: POUT +XXXXX.X
Measuring range: Due to the fact that the UOUT and IOUT
measuring functions are utilized, the respective measuring ranges
apply for power measurements as well. If one or both of the mea-
sured quantities UOUT and IOUT violate their respective measur-
ing ranges, the product of POUT (UOUT x IOUT) is
displayed as “–OL” or “OL”, or “+/–999999” is entered to the data
string.
POWER_ON, POWER_ON? – Response After Power On
Menu
Function
The POWER_ON function determines the status of device
settings after mains power has been switched on.
Setting Command
Syntax: POWER_ON txt
Parameter txt: RST/SBY/RCL/R01 ... R12/15
Default setting
or after RESET (*RST): RST
Query Command
Syntax: POWER_ON?
Sample response string: POWER_ON RST
Parameters List
PSET, PSET?
SELECT A
Function
The PSET Function
1)
is activated by preselecting a PSET parame-
ter value < Pnom.
The PSET operating mode is indicated by the active green „CP-
LED“
1)
, query „MODE?“ leads to reply „MODE CP“.
(The condition and event register queries „CRA?“ and „ERA?“
invariably supply the control status of the power section and are
to be interpreted accordingly.)
By using the measuring functions, setting values for voltage and
current are temporarily calculated and read out to the digital-ana-
log converters for the specified load. The „digital control range“ is
limited by settings USET and ISET. If the setpoint value PSET can-
not be achieved for the connected load, it is additionally indicated
by the LED „CV“ or „CC“.
Attention!
!
Activation of PSET automatically switches off the analog
command inputs Uext and Iext, i. e. corresponding to
„ANALOG_IN OFF, OFF“. The PSET function cannot be
combined with the SEQUENCE function!
Setting Command
Syntax: PSET w
Value range: 0  w  Pnom
w = Pnom (no power control)
Default setting
and/or after RESET (*RST): w = Pnom
2)
Query Command
Syntax: PSET?
PSET +XXXXX.X
Sample response string: PSET +01499.9
1)
„Power control“, available as from firmware version 004
2)
After „*RST“, the maximum possible output power of the device can be queried
with query command PSET?. Depending on whether the device is operated with
115 Vac or 230 Vac mains power, the query supplies Pnom/2 or Pnom.
Parame-
ters
For:
Device
Type
Setting Range Setting resolution
Nom.
Voltage [V]
OVSETmin.
[V]
OVSETmax.
[V]
Remote
[V]
Manual
[V]
w 60 3.00 80.00 0.02 0.02
Param-
eter
Content Meaning
txt
RST RESET:
Defined default settings are utilized
 default settings
SBY STANDBY:
Same device settings as before shutdown, but the power output
remains inactive (OUTPUT OFF)
RCL RECALL:
Same device settings as before shutdown – power output remains
in previous state
Rxx Recall a device configuration saved to setup memory under XX