Siemens SINAMICS G110

04/2005 Using the SINAMICS G110
SINAMICS G110 Operating Instructions
6SL3298-0AA11-0BP0
57
4.3.1.2 ON/OFF1 and ON_REV/OFF1
Overview
This method allows the inverter to run the motor in a forward direction (run right)
using the ON/OFF1 command and in the opposite direction (run left) using the
ON_REV/OFF1.
However, for a direction reversal the drive will first have to decelerate with OFF1
and when reaching 0 Hz the reverse signal can be applied.
Function
The following description refers to Figure 4-2.
The ramp down phase can be interrupted by start command in the same direction:
if the drive was operating in forward and OFF1 was applied, an ON/OFF1 will work
correctly and accelerate again the drive up to the setpoint speed. The same is valid
for reverse and ON REV/OFF1
Giving a start command for the opposite direction of which the inverter frequency
output is ramping down, the drive ignores the new setting and the drive will ramp
down to 0 Hz and then remain at standstill.
Without any control signal enabled the drive will ramp down to a stop and remain at
standstill.
Equivalent Control Inputs
Time
Control
Commands
ON/OFF1
ON_REV/OFF1
ON/OFF1
ON/OFF1
ON_REV/OFF1
Ignored
Ignored
ON_REV/OFF1
Active
Active
Act.
o
o = OFF1
o
o
Inverter
Frequency
f out
Figure 4-2 Siemens standard control using ON/OFF1 and ON_REV/OFF1