The operating control works with two periods:
■ Minimum running period: It is calculated from the motor's starting frequency and is only used
for blowers with idle valve. This parameter cannot be set by customers and is only active with
machine type STC.
■ Venting period: In the Local mode, the venting period is always 0 s. In the remote mode, this
time depends on the setting in menu 10.4. In machines without idle valve, it is at most 1 s.
Objective of the venting period: Preventing undesirable switching processes of the motor due to
signal faults. Reducing the response time for load demand when the blower is still in idle mode.
The following operational states are identified:
STOP
The machine is connected to the power supply.
The machine is switched off.
■ The
voltage applied to controller
LED lights green.
■ The
ON
LED is extinguished.
■ The
IDLE
LED is extinguished.
■ The
LOAD
LED is extinguished.
■ The drive motor is stopped.
■ The sound enclosure's fan stops.
READY
The machine has been activated with «ON»:
■ The
ON
LED lights green.
■ The
IDLE
LED is extinguished.
■ The
LOAD
LED is extinguished.
■ The drive motor is stopped.
■ The fan of the sound enclosure may still run.
In addition, timing and/or remote control may affect the start of the drive motor.
MOTOR START
The machine has been activated with «ON»:
■ The
ON
LED lights green.
■ The
IDLE
LED lights green.
■ The
LOAD
LED is extinguished.
■ The drive motor is started
■ The sound enclosure's fan runs
■ The Load/Idle valve is open.
IDLE
1)
The air generated by the compressor is vented into the atmosphere.
The drive motor runs unloaded and consumes very little power.
■ The
IDLE
LED lights green.
5 Design and Function
5.8 Control modes
No.: 901700 10 E
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 2.5.3
43
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