90 Standard program features Rush controlIn torque control, the motor could potentially rush if the load were suddenly lost. Thecontrol program has a rush control function that decreases the torque referencewhenever the motor speed exceeds 30.11 Minimum speed or 30.12 Maximum speed.The function is based on a PID controller. The proportional gain and integration timecan be defined by parameters. Setting these to zero disables rush control.SettingsParameters 26.81 Rush control gain and 26.82 Rush control integration time (page285). Encoder supportThe program supports two single-turn or multi-turn encoders (or resolvers). Thefollowing optional interface modules are available:• TTL encoder interface FEN-01: two TTL inputs, TTL output (for encoderemulation and echo) and two digital inputs• Absolute encoder interface FEN-11: absolute encoder input, TTL input, TTLoutput (for encoder emulation and echo) and two digital inputs• Resolver interface FEN-21: resolver input, TTL input, TTL output (for encoderemulation echo) and two digital inputs• HTL encoder interface FEN-31: HTL encoder input, TTL output (for encoderemulation and echo) and two digital inputs.• HTL/TTL encoder interface FSE-31 (for use with an FSO-xx safety functionsmodule): Two HTL/TTL encoder inputs (one HTL input supported at the time ofpublication).You must install the interface module onto one of the option slots of the drive controlunit. The module (except the FSE-31) can also be installed onto an FEA-03 extensionadapter.Motor speedTimeOverspeed trip levelOverspeed trip level31.30 Overspeed trip margin031.30 Overspeed trip margin30.1230.11Rush control active
