11.2.9 VLT
®
Safe Option MCB 15x
NOTICE
For more information on MCB 15x see the
MCB 15x Safe
Option Operating Instructions
.
130BC308.10
Field bus
Interface
MCB 150/151
Safety Option
O
pt
io
n
A
O
pt
io
n
B
Internal Bus 1
Internal Bus 2
μ C
Control Card
IGBT
STO
37
E
M
PLC
EM
ER ENCY
G
ST OP
Illustration 11.19 Safe Drive System
The MCB 15x performs safety functions in accordance with
EN IEC 61800-5-2. It monitors safe motion sequences on
frequency converters, which are safely brought to a stop
and shut down in the event of an error.
The MCB 15x is built into a VLT
®
AutomationDrive FC 302
and requires a signal from a sensor unit. A safe drive
system from Danfoss consists of the following
•
Frequency converter, VLT
®
AutomationDrive FC
302
•
MCB 15x built into the frequency converter
The MCB 15x
•
activates safety functions
•
monitors safe motion sequences
•
signals the status of safety functions to the safety
control system via possible connected Profibus
fieldbus
•
activates the selected failure reaction Safe Torque
Off or Safe Stop 1, in the event of an error
There are 2 variants of the MCB 15x, one with HTL encoder
interface (MCB 151) and one with TTL encoder interface
(MCB 150).
The MCB 15x Safe Option is constructed as a standard
option for the VLT
®
AutomationDrive FC 302 and is
automatically detected after mounting.
The MCB 15x can be used to monitor the stopping,
starting or speed of a rotating or laterally moving device.
As speed monitor, the option is often used in combination
with hard guarding, access doors, and safety gates with
solenoid-lock or -unlock safety switches. When the speed
of the monitored device drops below the set switch point
(where its speed is no longer considered dangerous), the
MCB 15x sets S37 output low. This allows the operator to
open the safety gate. In speed monitor applications, the
safety output S37 is high for operation (when the motor
speed of the monitored device is below the set switch
point). When the speed exceeds the set value, indicating a
too-high (dangerous) speed, the safety output is low.
The frequency converter
•
removes the power to the motor,
•
switches the motor to torque-free, if Safe Torque
Off is activated
The safety control system
•
activates the safety functions via inputs on the
MCB 15x
•
evaluates signals from safety devices, such as
•
E-STOP push buttons
•
Non Contact Magnetic switch
•
Interlocking switch
•
Light curtain devices
•
processes the MCB 15x status function
•
provides safe connection between MCB 15x and
safety control system
•
provides fault detection at activation of safety
functions (shorts across contacts, short circuit) on
signal between the safety control system and
MCB 15x
Options and Accessories
VLT
®
AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
MG33BF02 - Rev. 2013-12-20
165
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