Wiring a Contactor to On-Board Output on the WatchMon Supervisor

For WatchMon 4.2 or WatchMonPlus 5.2 or earlier refer to version for 4 pin 

When connecting to the controlled Outputs (that are using mosfets) make sure that these loads    do not have large inrush currents. The typically DC-DC or other components have capacitors that can draw large inrush currents when first switched on, compared to their continuous running consumption.  The WatchMon supervisor and expansion boards outputs are rated to 3A (default), they will fail when the inrush currents exceed their rating (x2 even for micro / milliseconds).  We recommend to reduce complexity by sticking to a single voltage rather than using DC-DC (i.e. if powering from 48V pack use a 48V fan to avoid the need for DC-DC, or if 24V pack then 24V fan, contactor etc) only use if you have sufficient expertise.

For large (or unknown) loads make sure you use an external relay/SSR (Solid State Relays) that is appropriate for the rated purpose.

Normally OPEN Contactor to On-board WatchMon - Pin 5

Normally OPEN Contactor with Sensor Circuit to On-board WatchMon - Pin 5

Locating Input & Output Connections on WatchMon4

The inputs and outputs on the WatchMon 4 can be configured on the Hardware - Expansion settings as inputs and Outputs A. See the Hardware Configuration - Expansion Settings

The options for what to trigger the contactor as at WatchMon Toolkit software are

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