Delta Tau Geo Brick, User Manual

Page: 33 / 294

Geo Brick Drive User Manual
Pinouts and Software Setup 33
J2: 24VDC Logic Power and Safe Torque Off (STO)
J2 is used to bring the 24VDC logic power into the Geo Brick Drive. This power can remain on,
regardless of the main AC/DC bus power input, allowing the digital control electronics to be active while
the main motor power control is passive.
J2, in the
newer models of the Geo Brick Drive, is also used to wire the Safe Torque Off (STO) input.
The STO allows the complete (hardware) disconnection of the power amplifiers from the motors. This
mechanism prevents unintentional “movement of” or torque output to the motors in accordance with
IEC/EN safety standards.
Newer and older models of the Geo Brick Drive have different 24V logic power connector. The new
connector is a 4-pin (as opposed to the older 2-pin) accommodating the STO function. It is a Phoenix
Contact terminal block (as opposed to the older Molex type) which allows for easier connection without
the need of special crimping tools:

The newer models were introduced in October of 2012. They can be recognized by the 4-pin
terminal block 24V logic with STO connector.

The older models carry the Molex type 2-pin 24V logic connector (no STO).
Note
The Safe Torque Off (STO) feature is not available with older models
of the Geo Brick Drive.
It is recommended to use a protected power supply. In situations where the power supply is shared with
other devices, it may be desirable to insert a filter before applying it to the Geo Brick Drive.
If multiple drives are driven out of the same 24VDC power supply, it is recommended that each Geo
Brick Drive be wired back to the power supply terminals independently. It is also recommended that the
power supply be sized to handle the instantaneous inrush current required to start up the DC-to-DC
converter action inside the Drive(s).
See electrical specifications.
Note
The logic and STO connections can be made using a 22 gauge (AWG)
wire.