Power modules are designed with multiple protection functions to avoid various unexpected conditions, for example output values exceeding the set limits which (if unchecked) could cause permanent damage to a connected device or the power module itself.

 

10.1. Clear / Disable protection

Clearing an activated protection mode, disabling protection modes or setting protection mode parameters may be accessed via Protections section on the Channel protection and settings page.

 

Clear

Use this option to clear all tripped protection modes so that channel outputs can be re-enabled as needed.

The status of active protections is not affected by this option.

bb3_man_clear_protections.jpg

 

 

SCPI

OUTPut:PROTection:CLEar

 

Clear and disable

This option cleared all tripped protections and disables all currently activated protections.

 

SCPI

CURRent:PROTection:STATe OFF

POWer:PROTection:STATe OFF

VOLTage:PROTection:STATe OFF

SYSTem:TEMPerature:PROTection:STATe OFF, <sensor>

 

10.2. Current limit and OCP

Limit

Defines the max. value of the output current that the user will be able to set. The initial value is max. current the module can source (e.g. 5 A for the DCP405 module).

 

Changing the limit will also affect graphical views (vertical bar, horizontal bar and YT views), which will increase readability. For example, if the limit is set to 1 A, this value will become 100% of the scale instead of only 20% when the limit is at 5 A.

bb3_man_ocp_settings.jpg

 

 

SCPI

CURRent:LIMit {<current>}

 

OCP active

The OCP (Over-Current Protection) is software protection that will activate when drawn current reaches the set value of the allowed output current. A protection mode trip will be recorded in the event log and the channel output will be turned off.

 

Use this option to turn OCP on or off. If OCP is off, if the output current reaches the set value (Iset) the channel will switch from CV to CC mode without turning off the channel output.

 

SCPI

CURRent:PROTection:STATe {<bool>}

 

Trip delay

If the OCP is enabled and the output current reaches the set value (Iset), an OCP trip will occur at the earliest after the set delay time expires.

 

SCPI

CURRent:PROTection:DELay {<time>}

 

10.3. Voltage limit and OVP

Limit

Defines the max. value of the output voltage that the user will be able to set. The initial value is max. voltage the module can source (e.g. 40 V for the DCP405 module).

 

SCPI

VOLTage:LIMit {<voltage>}

 

 

OVP active

bb3_man_ovp_sw_settings.jpg

 

The OVP (Over-Voltage Protection) is software protection that will activate when output voltage reaches the programmed value. Protection trip will be recorded in the event log and the channel output will be turned off.

 

Turns OVP on or off. If OVP is off (which is default), when the output voltage reaches the set value (Uset) the channel will enter the CV mode (which is normal behavior if the connected load does not draw more current than the maximum set). Therefore, when activating OVP without load or with connected load that draws less than the set current, the channel will enter CV mode and the OVP will immediately trip. To avoid this the channel should be in CC mode prior to the output being turned on.

 

SCPI

VOLTage:PROTection:STATe {<bool>}

 

OVP type

Selection between software and hardware OVP is only possible with DCP405 modules.

 

SCPI

VOLTage:PROTection:TYPE SW

 

Trip level

The trip level value may be greater than or equal to the set voltage (Uset) and determines the value of the output voltage at which the OVP will trip. In case the set value of the output voltage increases, the trip level will automatically increase.

For example, if the trip level was set at 10 V while the output voltage was also at 10 V and its value increased to 12 V, the trip level value would also increase to 12 V. But, if the voltage drops to say 5 V, the trip level will remain unchanged.

 

Max. trip value is 0.5 V greater than max. output voltage (40.5 V for DCP405 or 20.5 V for DCM220 module).

 

SCPI

VOLTage:PROTection {<voltage>}

 

Trip delay

If the OVP is enabled and the output voltage reaches the set trip level, an OVP trip will occur at the earliest after the set delay time expires.

 

SCPI

VOLTage:PROTection:DELay {<time>}

 

10.4. Hardware OVP

The DCP405 module also contains hardware OVP that works on a slightly different principle. Unlike software OVP where it is possible to adjust the trip level, with this protection the trip level is automatically set at approximately 3% above the set voltage output. The response rate (ie trip delay) also cannot be changed, but the OVP circuit will respond as quickly as possible.

 

SCPI

VOLTage:PROTection:TYPE HW

bb3_man_ovp_hw_settings.jpg

 

 

10.5. Power limit and OPP

Limit

Defines the max. value of the output power that the user will be able to set. The initial value is max. power the module can source (e.g. 155 W for the DCP405 module).

 

SCPI

POWer:LIMit {<power>}

 

 

OPP active

bb3_man_opp_settings.jpg

 

The OPP (Over-Power Protection) is software protection that will activate when output power reaches the programmed value. Protection trip will be recorded in the event log and the channel output will be turned off.

 

SCPI

POWer:PROTection:STATe {<bool>}

 

Trip level

The trip level value may be less than or equal to the set limit and determines the value of the output power at which the OPP will trip. When the power limit is set to a lower value, the trip level will also decrease.

 

SCPI

POWer:PROTection {<power>}

 

Trip delay

If the OPP is enabled and the output power reaches the set trip level, an OPP trip will occur at the earliest after the set delay time expires.

 

SCPI

POWer:PROTection:DELay {<time>}

 

10.6. Temperature (OTP)

OTP active

The OTP (Over-Temperature Protection) is software protection that will activate when the temperature measured on the channel’s temperature sensor is equal to or greater than the set trip level value for a duration of trip delay.

 

Protection trip will be recorded in the event log and the channel output will be turned off.

 

bb3_man_otp_settings.jpg

 

Dual channel modules like the DCM220 have two temperature sensors, one for each channel.

 

SCPI

SYSTem:TEMPerature:PROTection:STATe {<bool>} [, <sensor>]

 

Trip level

The trip level value may be less than or equal to the set limit and determines the value of the measured temperature at which the OTP will trip.

 

SCPI

SYSTem:TEMPerature:PROTection {<temperature>}, <sensor>]

 

Trip delay

If the OTP is enabled and the temperature reaches the set trip level, an OTP trip will occur at the earliest after the set delay time expires.

 

SCPI

SYSTem:TEMPerature:PROTection:DELay {<delay>}, <sensor>