Schematic

Safety Recommendations
40 Advanced Digital Motor Controller User Manual V1.8, August 28, 2017
+-
VMot
Ground
RS232
Digital Output
Controller
PC, PLC or
Microcomputer
Main
Battery
I/O Connector
PwrCtrl
On/Off Switch
Ground
FIGURE 2-7. Example of safety disconnect via supervisory system
Self Protection against Power Stage Failure
If the controller processor is still operational, it can self detect several, although not all,
situations where a motor is running while the power stage is off. The figure below shows
a protection circuit using an external contactor relay.
VMot
Ground
Digital Out
Emergency
Disconnect
Contactor
to +40V Max
+-
Main
Battery
I/O Connector
PwrCtrl
On/Off Switch
Ground
Controller
FIGURE 2-8. Self protection circuit using contactor
Note: Digital outputs are rated 40V max. If the battery voltage is higher than 40V, the relay
must be connected to the + of an alternate power source of lower voltage.