X21 Digital Inputs/Outputs - Siemens SINAMICS S120 Equipment Manual

Booksize DC Link Components
5.1 Braking Modules
5.1.3.4

X21 digital inputs/outputs

Table 5-2 Terminal block X21
Terminal
1
2
3
4
5
6
Max. connectable cross-section 1.5 mm
Type: Screw terminal 1 (see Connection systems)
1) DI: Digital input; DO: Digital output; M: Electronics ground
2) The fast discharge function is used for discharging the capacitors in the DC link after
interruption of the mains supply. This functions may be used 1 to 2 times per week at the
most. This makes sense, for example, when maintenance tasks are to be performed at the
Motor Module and/or motor installation (reduction of the discharge time). For this purpose,
the drive system must be completely disconnected from the supply and the motors must be
in standstill position.
Prior to performing maintenance task at the drive system, the following tasks must be
performed:
1. Disconnect the system.
2. Protect against reconnection.
3. Make sure that the equipment is de-energized.
4. Ground and short-circuit.
5. Cover or enclose adjacent components that are still live
These tasks must be performed in the above mentioned order prior to maintenance. After
maintenance proceed in the reverse order.
334
Designation
1)
DI low: Enable Braking Module
DI high: Inhibit / acknowledge
Edge change high -> low: Fault
acknowledgement
DI low: Braking resistor not activated
manually
DI high: Braking resistor activated manually
(fast discharge)
2)
Safety functions remain active, I*t protection
remains active
If X21.1 and 2 are activated simultaneously,
the Braking Module inhibit has priority.
DO high: No pre-warning for I*t shutdown
DO low: Pre-warning for I*t shutdown (80 %
of max. ON time reached)
DO high: Ready for operation, no fault
DO low: Fault (1→0)
Ground
2
DANGER
Technical specifications
Voltage: -3 V to 30 V
Typical current consumption: 10 mA
at 24 V DC
Level (incl. ripple)
High level: 15 V to 30 V
Low level: -3 V to 5 V
Max. load current per output: 100 mA
Continued-short-circuit-proof
Voltage: 24 V DC
SINAMICS S120 Booksize Power Units
Equipment Manual, (GH2), 07/2007, 6SL3097-2AC00-0BP5