Sequencing - Stulz S-Klima C7000 User Manual

A special function exists for the zone control:

- Sequencing.

8.2.1 Sequencing
A time-dependent unit change-over is realized using sequencing. With help
from standby units, a high level of operational reliability and an even unit uti-
lization is achieved.
The sequencing time (parameter in the first line of menu Z1) sets the time for
periodic change-overs. This means that the standby unit(s) is (are) changed
over one by one. No sequencing takes place if the setting is 0 (hrs).
Sequencing starts when the zone parameter is allocated.
The functioning of the sequence can be checked by activating the test se-
quencing (Parameter in the fifth line of the Z1 menu) with a fixed sequencing
time of 5 minutes.
All of the zone's basic functions that have been described on the previous
pages are also possible in sequencing mode.
a. Medium value calculation or deac-
tivation
b. Alarm change-over
c. Backup operation
d. Additional capacity
Sequencing runs irrespective of ad-
ditional capacity and irrespective of
defective units.
Even a defective unit can be set in
standby mode by sequencing. It is
only discovered that the unit has an
error and remains switched off when
the unit should be switched on as a
result of the change-over. As a result,
the standby unit with the next highest
bus address is switched on.
The unit that is intended for additional
capacity can only be switched on
during cycles in which it is in standby
mode.
BA C7000 for EC Tower | EN | 01-2019 | 1000755
Time-dependent change-over
(normal sequencing)
e.g. with 2 standby units:
1. Cycle Unit 07, 11 standby
2. Cycle Unit 08, 14 standby
3. Cycle Unit 11, 01 standby
etc.
Zone 01
Stand
-by
Unit 01 Unit 03 Unit 07
Stand
-by
Unit 08 Unit 11 Unit 14
Cycle 1
Zone 01
Unit 01 Unit 03 Unit 07
Stand Stand
-by -by
Unit 08 Unit 11 Unit 14
Cycle 2
(Z1)
Change-over as a result of a fault
Zone 02
Stand
-by
Unit 02 Unit 04
Stand
-by
Unit 06 Unit 09
Cycle 1
Zone 02
Stand
-by
Unit 02 Unit 04
Stand
-by
Unit 06 Unit 09
Due to
Cycle 1
a unit 04
fault, unit 05 is
switched on.
Zone 02
Unit 02 Unit 04
Stand
-by
Unit 06 Unit 09
Cycle 2
Stand
-by
Unit 05
Unit 10
Unit 05
Unit 10
Unit 05
Stand
-by
Unit 10
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