■ The
LOAD LED is extinguished.
■ The sound enclosure's fan runs
■ The Load/Idle valve is open.
No air is transported.
1)
Only in combination with the optional idle valve.
LOAD
The drive motor runs under load:
■ The
IDLE LED is extinguished.
■ The
LOAD LED lights green.
■ The sound enclosure's fan runs
■ The Load run/Idle run valve is closed
Air is transported.
SHUT-DOWN
■ The
IDLE LED lights green.
■ The
LOAD LED is extinguished.
■ The remaining idle time is displayed in menu 1.4
■ The drive motor is running
■ The Idle valve is open
■ The sound enclosure's fan runs
5.8.2.1 Operating control without load/idle valve
When the operating voltage is applied to SIGMA CONTROL 2, the operation control is in STOP
operating mode and then switches to READY mode.
Triggered by the Load run command, the drive motor starts via the MOTOR START operating
mode and switches to LOAD operating mode. When the Load run command is no longer present,
the READY operating state is assumed and the drive motor is stopped.
If the operating control is in READY, MOTOR START or LOAD mode and the shut-down command
is present, the operation control switches to the SHUT-DOWN operating state.
As soon as the shut-down process is completed or the stop command is issued, the operating con‐
trol switches to the STOP operating state after the venting period has elapsed (menu 10.4 -> max.
1 s).
5.8.2.2 Operating control with load/idle valve
If the Load or Idle run command is present, the drive motor starts via the MOTOR START operat‐
ing state.
If the Load run command is present, the machine will switch to LOAD after the motor start is com‐
pleted.
If the Idle command is present, the operation control remains in IDLE.
If there is no Load run nor Idle command present, the operating control switches to the SHUT-
DOWN state. This state is only left after the venting period has elapsed and the minimum run time
has been reached.
5
Design and Function
5.8
Control modes
44
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 4.0.X
No.: 901700 14 E
