Commands¶
The following commands allow the user to control when the WRx Series MagnaLOAD DC electronic load’s power processing circuitry is engaged and when faults are cleared. These commands are available from the front panel, external user I/O and computer commands. To control which interfaces these commands are available from, the user can control these settings with the following configuration settings:
- INT CTL: Front panel control for Start, Stop, and Clear.
- EXT CTL: External user I/O and computer control for Start, Stop, and Clear.
INT EXT and EXT CTL can both be enabled simulatenously, if desired, for Start, Stop, and Clear control from a variety of interfaces.
Caution
Only disable INT CTL if verified external or computer controls are in place, as it will prevent the user from stopping the product from the front panel.
Start¶
The Start command engages the power processing circuitry, signaled by a click of the product’s AC input contactor engaging, placing the product in a powered state. The Start command can only be issued when the product is in standby. If the product is either in a alarm state or in a power state, the Start command will have no effect.
After issuing the Start command, the product enters in a soft start, which is a pre-charge circuit used to prevent in-rush current.
Note
For applications demanding fast and/or high repetition cycle times off and on, once in a powered state, it’s recommended to program the product to zero and then back up to the desired set point, instead of using Stop/Start commands. Programming the product down to zero and then back up to the set point eliminates soft start circuitry delay and provides the fastest achievable rise time.
For more information on the Start command:
Stop¶
The Stop command disengages the power processing circuitry, signaled by a click of the product’s AC input contactor disengaging, placing the product in a standby state. The Stop command can only be issued when the product is in a powered state. If the product is either in an alarm state or in standy state, the Stop command will have no effect.
For safety, the Stop command always takes precedence over any other active command, regardless of the interface. If a Start command is issued while the Stop command is active, the product will not engage.
For more information on the Stop command:
Clear¶
The Clear command unlatches a fault from memory and transitions the front from an alarm state to standby state. After a fault has occurred, the Clear command must be issued before the product is able to resume operation. Alternatively, the product can be power cycled. The Clear command will only unlatch a fault from memory if the fault condition has been resolved.
For more information on the Clear command: