Chapter 6 – Parameters
6-48
ACH 500 Programming Manual
4 REFERENCE STEP 2
0 – 100%
Value that the setpoint (reference) is increased when the second lag motor is
started.
5 REFERENCE STEP 3
0 – 100%
Value that the setpoint (reference) is increased when the third lag motor is
started.
Sleep Function
Sleep function is a special energy savings facility. This function can be used
in pumping stations, for example, to minimize energy consumption by
stopping the regulated pump automatically if demand stays very low longer
than the preset time. Usually water consumption at night is almost zero and
the regulated pump runs at the set minimum speed, which normally means
that flow through the pump is zero. The sleep level (Parameter 40.2.7) and
sleep delay (Parameter 40.2.8) parameters define when PFC stops the
regulated pump. The wake-up level (Parameter 40.2.8) defines the start level
which the actual signal has to reach to restart the regulated pump. Figure 6-21
shows an example of a sleep function.
Figure 6-21 Sleep Function Example
6 SLEEP DELAY
0 – 3600s
If the output frequency remains below the set sleep level longer than the Sleep
Delay, the ACH 500 is stopped automatically. If Sleep Delay is set to 0, the
sleep function is disabled.
Actual Value
Wake-up Level,
Param. 40.2.8
Sleep Level,
Param. 40.2.7
Regulated
Pump
Frequency
Sleep Delay Time,
Param. 40.2.6
t < t
d
t
d
“Sleep Time”
Time
Time
STOP
START
