ctrlX SAFETY "SafeMotion"
Safety functions in special mode "Safe standstill"
To control (release) the brake, the following actions have to be taken:
● The "release holding system" control signal (P-0-3265.0.2) has to be set via a
safe input or the safety bus.
●
The command (C2000) to release the motor holding brake has to be started
to control (to release) the brakes.
WARNING
Lethal injury and/or property damage caused by unin-
tended axis motion!
⇒ If the brake is manually controlled via the
"release holding brake" control signal, the drive is no
longer able to counteract external force influences. In
this state, the safety technology does not carry out any
monitoring function!
If external force influences are to be expected, e.g. in
the case of a vertical axis, this motion has to be safely
prevented by additional measures, e.g. a counterweight.
Terminating the safety function
The "Safe brake control" function can only be terminated indirectly by dese-
lecting the special mode "Safe standstill 1" (SMST1) / "Emergency stop"
(SMES).
Brake requirements
See the Application Manual of the firmware on how to commission the motor
holding brake.
When using the safety function "Safe brake control“ (SBC), the brakes have to
meet the following requirements:
●
Control:
The brake has to be designed so that the holding torque of the brake takes
effect in the de-energized state (e.g., electrically releasing holding brake).
Only self-holding (electrically releasing) brakes are supported (P-0-0525,
bit 0="0").
●
Electrical connections:
– The electrical connections of the brake should not have ground reference.
– Since a disturbance or a failure of the supply voltage can result in brake
failure, the power supply of the brakes should be independent and pro-
tected against overvoltage and interruptions (UPS).
– The brake current in the activated state has to be between 0.1 A and
the maximum output current of the brake connection (see "⮫ Table 13
Maximum allowed output current for holding brake according to device
and connection on page 81")
–
When selecting the brake, it has to be taken into account that the control
current is monitored for a fixed minimum value.
● Mechanics:
– Both friction surface brakes and form-fitting brakes are allowed as
holding brakes.
– The static holding torque of the brake has to be dimensioned so that
the maximum load due to weight of the axis can be safely held (see Divi-
sion Information Sheet No. 005 of the German Social Accident Insurance
(DGUV) "Gravity-loaded axes - Vertical axes” and C-standards).
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