Gossen MetraWatt P1500, Operating Instructions Manual

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48 GMC-I Messtechnik GmbH
OCP, OCP? – Overcurrent Protection
Menu, LED
Function
The OCP function ( o ver c urrent p rotection) determines how the
power output will respond if load current climbs to the selected
OCSET value.
The OCP function is used in addition to current regulation, whose
setpoint is specified with ISET or via the analog control input.
The OCP function protects connected power consumers against
continuous overcurrent, although a higher current value is
required intermittently. The function also makes it possible to
activate another device configuration in case of overcurrent.
Load current is compared with the OCSET value generated with
an integrated D-A converter by means of an autonomous
comparator, and is evaluated.
The ensuing reaction is shown in the following table.
Activation of the OCP function is indicated at the front panel by
means of the “OCP ON” LED. If OCP has caused shutdown, this
is additionally indicated by the “OCP” LED.
Setting Command
Syntax:
OCP txt
Parameter txt: OFF/ON/R01 ... R12/15
Default setting
or after RESET (*RST): OFF
Query Command
Syntax:
OCP?
Sample response string:
OCP OFF
Parameters List
OCSET, OCSET? – Overcurrent Protection Trigger Value
SELECT B, Menu
Function
The triggering threshold reference value required for the OCP
function is set with OCSET.
Setting Command
Syntax:
OCSET w
Value range: OCSETmin

w

OCSETmax
Default setting
or after RESET (*RST): OCSETmax
Query Command
Syntax:
OCSET?
Sample response string:
OCSET +080.000
OC_DELAY, OC_DELAY? – Overcurrent Protection Trigger Delay
Menu
Function
Desired response delay for the OCP function is set with OC_DE-
LAY. Delay time is specified in seconds.
If output current drops to below the OCSET value before OC_DE-
LAY expires, the shutdown sequence is interrupted and restarted
the next time the threshold is exceeded.
Setting Command
Syntax:
OC_DELAY w
Value range: 0

w

65,535
Default setting
or after RESET (*RST):
0
Query Command
Syntax:
OC_DELAY?
Sample response string:
OC_DELAY XX.XXX
Param-
eter Content Meaning
txt
OFF
OCP function is inactive
ON
OCP function activated:
The output is shut down if output current is equal to or exceeds the
specified OC_SET limit value for a duration of OC_DELAY.
Rxx
Instead of a shutdown, recall of a device configuration from setup
memories 01 through 12/15 can be activated with R01 ... R12/15.
Device
Type
Setting Range Setting Resolution
Nom.
Current [A]
OCSETmin.
[A]
OCSETmax.
[A]
Remote
[A]
Manual
[A]
60 3.00 80.00 0.02 0.02
120 6.00 160.00 0.05 0.05
180 9.00 240.0 0.1 0.1