What does the standby jumper block do?
The standby jumper block causes the drive to either enter standby mode or not. When current standby is enabled, the current will be reduced to 30% after one second of inactivity. If it is disabled, then the current will stay at full current whether idle or not. You would keep the current standby disabled on an axis where constant torque is necessary, such as a Z axis. Keeping standby enabled will help reduce motor heat.