Xenus Plus User Guide 16-01344 Rev 06
Copley Controls 101
4.7.5: Wiring Example: Emergency Stop - Stopping Category 1
The figure below shows a wiring example for implementing a category 1 emergency stop function
using a XEL-XPL-XML drive. This type of implementation brings the motor speed to near zero
before the MTO function is activated. It is important to note that the torque-off state is not entered
immediately upon actuation of the E-stop button. The torque-off state is entered only after the MTO
inputs have become de-energized and the specified MTO response time has elapsed.
The example shows a safety relay with two sets of output contacts. One set (K1, K2) responds
immediately to changes on the safety relay inputs and the other (K3, K4) after a user switch-
programmable delay. A double pole, single throw E-stop switch is used to drive two independent
inputs to the safety relay. A momentary switch is wired to the safety relay reset input and is used to
reset the relay at start-up and after an E-stop event. The enable input on the drive is wired to one
of the immediate (INST) response contacts. The drive is programmed such that when this input is
de-energized, the drive decelerates the motor speed in a controlled fashion. After the programmed
delay time, contacts K3 and K4 open and de-energize the MTO inputs to the drive. The drive MTO
function responds accordingly and the torque-off state is entered within the specified drive MTO
response time.
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