11.2.5
VLT
®
Safe PLC Interface Option MCB
108
The Safe PLC Interface Option MCB 108 is designed to be
built-in between the Safe dual pole (plus/minus) on the
Safe PLC and the Safe Stop input on FC 302. The Safe PLC
interface allows the safe output on the Safe PLC to
maintain the test pulses on the plus and minus output
without impacting the sensor signal to safe stop T37.
It can be used in combination with safety devices to satisfy
the requirement of IEC61800-5-2 SIL 2, ISO13849-1 cat. 3
for Safe Torque Off (STO).
The option module MCB 108 is galvanically isolated via an
internal DC/DC converter and it can be fitted into option
slot B.
Input voltage (DC) 18-28 V DC
Typical current input (DC) 60 mA
Max. current input (DC) 110 mA DC
Max. current inrush (DC) 500 mA DC
Output voltage (DC) 20 V DC@Vin = 24 V
Turn on delay 1 ms
Turn off delay 3 ms
Observe the following precautions
•
The FC 302 with MCB 108 (including the
connections between X31/9 and Terminal 37)
must be placed inside an IP54 enclosure.
•
Safe Stop activation (i.e. removal of 24 V DC
voltage supply to terminal 37 by removing
voltage to dual pole input of MCB 108) does not
provide electrical safety.
•
The safety device connected to the dual pole
input of the MCB 108 must fulfill the
requirements of cat. 3 / PL d according to ISO
13849-1 for interrupting the voltage/current to
the MCB 108. This also applies for the
connections between the MCB 108 and the safety
device.
•
Read and follow the instructions for the safety
device to connect it properly to MCB 108.
Illustration 11.13 Option Module Safe PLC Interface MCB 108
Safe PLC
MCB 108
FC 302
24 V DC
P - Control
P - Monitor
M - Monitor
M - Monitor
GND
X31/2
X31/3
GND
GX
X31/9
X31/10
37
20
Safe
channel
Illustration 11.14 Safe PLC Interface MCB 108 Connection
Options and Accessories
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
160 MG33BF02 - Rev. 2013-12-20
1111
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