ABB ACS140 - Page 85

76
4013 PID SLEEP DELAY
Time delay for the sleep function, see Figure 17. If the ACS140 output
frequency is below a set level (parameter 4014
SLEEP LEVEL) longer than PID
SLEEP DELAY, ACS140 is stopped.
4014 PID SLEEP LEVEL
Level for activation of sleep function, see Figure 17. When the ACS140 output
frequency falls below the sleep level, the sleep delay counter is started. When
the ACS140 output frequency rises above the sleep level, the sleep delay
counter is reset.
Note! Sleep level comparison is also inverted when error value is inverted using
parameter 4005
ERROR VALUE INV.
4015 WAKE-UP LEVEL
Level for deactivation of sleep function. This parameter sets a process actual
value limit for the sleep function (see Figure 17).The limit floats with the process
reference.
Non-inverted error value (parameter 4005 = 0)
Applied wake-up level is according to the following formula:
Limit = parameter 1107 +
parameter 4015 * (set point - parameter 1107) /
(parameter 1108 - parameter 1107)
When the actual value is less than or equal to this value, the sleep function is
de-activated. See Figure 18.
Inverted error value (parameter 4005 = 1)
Applied wake-up level is according to the following formula:
Limit = parameter 1108 +
parameter 4015 * (parameter 1108 - setpoint) /
(parameter 1108 - parameter 1107)
When the actual value is higher than or equal to this value, the sleep function is
de-activated. See Figure 19.
Figure 17 Sleep function operation.
Code Description
Frequency
SLEEP LEVEL
Parameter 4014
Time
STARTSTOP
t<td td
t
d
= SLEEP DELAY, Parameter 4013
WAKE-UP LEVEL
Parameter 4015
Time
Actual Value
www.barghmaher.org
ac.maher.co.ir