WARNING! Do not disconnect and reconnect the motor armature with the AC line applied or catastrophic
failure will result. See Section 13.2.
13.2 Armature Switching and Dynamic Braking – If the armature is to be disconnected and reconnected with the AC power applied, wire a relay (or contactor) and a brake resistor (RB) in the armature circuit. The Inhibit Circuit must be simultaneously activated when braking. Wire a double pole double throw (DPDT) mechanically ganged switch to the Inhibit Terminals and the relay (or contactor) coil, as shown in Figure 20. The resistance and wattage of RB must be chosen according to braking requirements. When the switch is in the “Brake” position, the relay is deenergized and allows the motor voltage, via the N.C. contact, to be dissipated through RB and dynamically brake the motor. Simultaneously, the Inhibit is activated and the control output is electronically “extinguished”, which eliminates arcing.
When the switch is in the “Run” position, the N.C. contact opens, the N. O. contact closes, the Inhibit is deactivated, and the motor begins to accelerate (according to the setting of the ACCEL Trimpot) to the Main
Speed Potentiometer setting.
WARNING! The Inhibit Circuit (Terminals “I1” and “I2”) is never to be used as a Safety Disconnect since it is not fail-safe. Use only the AC line for this purpose.