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CM2N3204E / 1.1999 Siemens Building Technologies
8/20 Landis & Staefa Division
In plants that use chilled water cooling coils/chillers:
- continuous checkback signals on the operational status of the plant and on the
status of the chilled water circulator or chiller, based on the signals received from
supervisory elements such as flow switch and overload protection
- switching on and off depending on the selected alarm priority («A» or «b»)
The RWI65.02 is able to acquire and handle seven fault status signals from plant
elements and statuses. The faults are indicated on the two lines at the bottom (lines 9
and 10) of the display when the front door is closed.
I,II
E6E4
E1
E2
E5
B9
E3
p
!
10
9
A 0 b 0
3204Z01
1 2 0
1234
657
1 Supervision of risk of frost (signal input B9)
Display: 0 = normal, «A» or «b» = frost alarm
2 Supervision of air flow (signal input E2)
Display: 0 = normal, 1 = start phase, «A» or «b» = faulty flow
3 Overload of chiller or chilled water circulator (signal input E4)
Display: 0 = Q13/Q24 cooling deactivated, 1 = Q13/Q24 cooling activated,
«A» or «b» = cooling at fault
4 Freely available, e.g. for filter supervision (signal input E6)
Display: 0 = normal, 1 = start phase, «A» or «b» = fault at E6
5 Overload/overtemperature at hot water circulator or electric heater battery (signal input E3)
Display: 0 = Q13/Q14 heating deactivated, 1 = Q13/Q14 heating activated,
«A» or «b» = pump or electric heater battery at fault
6 Overload of fan (signal input E5)
Display: 0 = Q33/Q34/Q44 fans deactivated, 1 = Q33/Q34 fan speed I activated,
2 = Q33/Q44 fan speed II activated, «A» or «b» = fan at fault
7 Supervision of fire/smoke (signal input E1)
Display: 0 = normal, «A» or «b» = fire/smoke alarm
Depending on the priority, fault status signals are indicated by a flashing «A» or «b»
in the display and by a flashing red LED located in the acknowledge button on the unit
front. Depending on the priority coding of contact output F91 («A» and «b» or «A» or
«b»), the fault status signal can also be passed on to F91 as a common fault status
signal.
For each status input, the priority of the fault status signal («A» or «b») can be selected.
Each of the status inputs E1 through E6 can be matched to the type of contact of the
respective signal element (N.O. or N.C. contact).
For status inputs E2 and E6, it is also possible to choose alarm delays to prevent false
alarms.
When a fault is indicated, it can be acknowledged with the acknowledge button located
on the unit front. In that case, the priority indication in the display and the red LED in the
button change from flash light to steady light. The indications extinguish when the fault
status signal is no longer present at the status input, belongs to priority «b», and there
are no other fault status signals present.
If it is a fault status signal of priority «A», the steady light is maintained as long as a fault
status signal of that priority is present. If there is no more fault status signal present, the
alarm status can be cleared by pressing the acknowledge button again.
For the effects of the fault status signals at the outputs of the RWI65.02, refer to the
function flow diagrams on the last page of this data sheet.
Fault status signals and
signalling
Acknowledging the fault
status signal
8


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