Wiring Example:sil 3/Cat. 3 Pl D Emergency Stop - Stopping Category 1; Xenus Plus Compact Configuration - Copley Controls Xenus Plus Compact Manual

Xenus Plus Compact STO Manual
7.1.4

Wiring Example:SIL 3/Cat. 3 PL d Emergency Stop - Stopping Category 1

Figure 5 below shows a wiring example for implementing a SIL3, Cat. 3 PL d, category 1 emergency stop
function using a Xenus Plus Compact. This type of implementation brings the motor speed to near zero before
the STO function is activated. It is important to note that the safe state is not entered immediately upon
actuation of the E-stop button. The safe state is entered only after the STO inputs have become de-energized
and the specified STO 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 STO inputs to the drive. The drive
STO function responds accordingly and the safe state is entered within the specified drive STO response time.
Fig. 5
7.1.5

Xenus Plus Compact Configuration

IN7 is an opto-isolated input that is programmed to Enable the drive. The INCOM signal for IN7 connects to
ground. When 24V is applied to IN7 it will enable the Xenus Plus Compact if no other inputs are configured as
Enables and no Enable inputs are inactive. If more than one input is configured as Enable, then all must be
active in order to enable the drive. The PNOZ s5 relay uses both contacts of the delayed relay (DLYD) for two-
channel control of the STO function, which is necessary for SIL 3, Cat. 3 PL d.
Copley Controls
16-01553 Rev 00
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