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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
13 Function block faults
05.02.2007
13.6 State diagrams of the individual types of
faults
A simple fault need not be acknowledged. If there is a fault relay (see below), it must be
reset, however.
313
1B
09
No fault
(acknowledged)
Faulty
(acknowledged)
Fault
going
Fault
coming
When there is a simple fault, the LED is lit. After correction of the fault, the LED will
extinguish.
If a fault relay is configured, the LED flashes when the fault occurs and the relay is
energized. When the fault button is pressed, the relay drops out and the LED extin-
guishes. When the fault is corrected, the LED will extinguish.
A standard fault must be acknowledged.
313
1B
10
Fault
going
No fault, not
acknowledged
LED dark
LED flashes
Acknowledge
fault
Fault
going
LED flashes
LED lit
No fault,
acknowledged
Faulty,
acknowledged
Faulty, not
acknowledged
Acknowledge
fault
Fault
coming
The LED flashes as long as the fault is not acknowledged. If the fault is still present, the
LED will be lit after acknowledgement.
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1B
11
Fault
going
Faulty,
acknowledged
Faulty, not
acknowledged
Acknowledge
fault
LED off,
fault relay off
LED flashes,
fault relay on
Fault
going
Acknowledge
fault
Fault
coming
No fault,
acknowledged
No fault, not
acknowledged
LED flashes,
fault relay on
LED off,
fault relay off
Extended faults are faults that must be acknowledged
and
reset. An example would be
a twin pump when both pumps indicate a fault. The pumps will start running only after
the fault has been acknowledged, the errors corrected and the fault reset.
Simple fault
Standard fault
Standard fault with
configured fault relay
Extended fault