SEW-Eurodrive MOVISAFE DCS21B

Manual – MOVIDRIVE® MDX61B Safety Module Option MOVISAFE® DCS..B
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3
Safety functions
Integrated Safety Technology
3.2.5 SS2(c) – Safe Stop 2
When the SS2(c) function is active, the inverter brings the motor to a standstill electri-
cally. At standstill, the drive inverter delivers the power to keep the motor in position. The
position must be safely monitored after a specified, safety-relevant time has elapsed
(SOS function according to EN 61800-5-2).
This safety function corresponds to a controlled stop of the drive according to EN 60204-
1, stop category 2.
9007201429937291
Safety function monitors
Safety function trips
v=Velocity
t=Time
t
1
= Point of time when SS2(c) is activated and motor deceleration is triggered
t
2
= Point of time when SOS is triggered
∆t = Safety-related period of time
t
1
t
2
t
Δt
V
INFORMATION
• The SS2(c) function does not monitor the stopping of the drive.
• The safety-relevant period of time ∆t allows the drive to come to a stop. In the event
of a fault, the drive does not come to a stop. It will not be de-energized until the time
t
2
(STO).
P
i
f
kVA
Hz
n