Sequential circuit
15
Application examples
15.7
L
15.7-1
EDS82EV903-1.0-11/2002
15.7 Sequential circuit
Two refrigeration compressors supply several refrigeration devices which are
switched on and off in irregular intervals.
)
))
) Note!
With the function module application I/O it is not necessary to use
the external time delay element of Fig. 15.7-1. The time delay for
the relay output K1 is set under C0423/1. The time delay prevents
the compressor 2 from being switched on when the actual value
fluctuates just a little bit.
l Compressor 1 is controlled by means of a 8200 motec or 8200 vector.
l Compressor 2 is connected to the mains and is switched on and off
depending on the consumption.
l The pressure setpoint of the process is selected as fixed value.
l Controller enable/inhibit to start and stop
l Process controller
l Fixed frequency
l Programmable relay output
l Adjustable thresholds
l Parameter set changeover
l Basic settings.
l Process controller configuration:
– Process controller optimisation
(¶ 10.10-1)
– Process controller has full influence: C0238 = 0, C0074 = 100 %
– Process controller setpoint source = Total setpoint: C0145 = 0
– Process setpoint = JOG frequency JOG1 (in PAR1 and PAR2 continuously
active via X3/E1): C0037 = 50 Hz
l Adaptation of parameter set 1 (PAR1) to application:
– Continuous activation of X3/E1 (LOW active): C0411 = 1
– Threshold for compressor 2: C0017 = 45 Hz.
– Connection of compressor 2 via relay: C0415/1 = 6.
l Adaptation of parameter set 2 (PAR2) to application:
– Continuous activation of X3/E1 (LOW active): C0411 = 1
– Threshold for disconnection of compressor 2: C0010 = 15 Hz (minimum
frequency).
– Disconnection of compressor 2 via relay: C0415/1 = 24.
– Relay output inversion: C0416 = 1.
l PAR changeover (PAR1 ⇔ PAR2) via X3/E2: C0410/13 = 2.
Conditions
Functions used
Application-specific
configuration
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