Siemens SINAMICS G110

04/2005 Using the SINAMICS G110
SINAMICS G110 Operating Instructions
6SL3298-0AA11-0BP0
59
4.3.3 3-wire Control (P0727=2)
Overview
This method uses three commands to control the operation of the motor:
1. STOP – Causes on OFF1 command to be performed by the inverter.
2. FWDP – Causes the motor to run in a forward direction (run right).
3. REVP – Causes the motor to run in the reverse direction (run left).
Function
The following description refers to Figure 4-4.
The STOP signal uses negative logic: Opening the contact or maintaining it open
causes an OFF1 condition and the drive stops. The STOP contact will need to be
maintained closed to start and run the drive.
Then a momentary closure (positive edge) of the FWDP or REVP contact latches
and starts the drive.
A momentary closure (positive edge) of the FWDP contact will set the forward
direction.
A momentary closure of the REVP contact will change to the reverse direction.
Closing FWDP and REVP will cause a Stop (OFF1).
The ramp down can be interrupted by a single new pulse FWDP or REVP.
A momentary closure of the FWDP or REVP contacts while the drive is operating in
the respective direction will not cause any change.
Only by opening the STOP contact the drive will switch off regularly, apart from the
special case that both signals FWDP and REVP are present.
Equivalent Control Inputs
Time
Control
Commands
STOP
FWDP
FWDP
REVP
o
o = OFF1
STOP
FWDP
REVP
STOP
REVP
o
Active Active
Active
Command
Ignored
Inverter
Frequency
f out
Figure 4-4 3-wire control using FWDP, REVP and STOP