User manual

42 GMC-I Gossen-Metrawatt GmbH
OCP, OCP? – Overcurrent Protection
Menu, LED
Function
The OCP function (over current protection) 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
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_DELAY. Delay time is specified in seconds.
If output current drops to below the OCSET value before
OC_DELAY 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 can be activated with R01 ... R12.
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