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© Wodtke GmbH - Tübingen. All Rights and Changes Reserved.Printed 04/2015 Part No. 950 976
17.1 Output of Operating and Collective Fault Messages (Relay Table)
As can be seen from the following table, the relay outputs R1, R2 and R4 are switched according to operating
state and any unit errors. This can be used to provide feedback from the wodtke unit to external controllers
or modems, for example. This makes remote querying of unit values possible. Operating states and collec-
tive faults are hereby defined as follows.
Notice:
15-minute fan stop delay "G OFF" is considered operating time.
Relays R1 and R2 are designed as normally open (not normally closed); that is, phase bypass
Relay R4 is designed as normally closed (potential-free, max. 2 A load capacity)
R1 = operating message:
R1 = 0 V = furnace off Display "R1 OFF"
R1 = 230 V = operation Display "R1 ON"
R2 = Collective fault message:
R2 = 0 V = fault Display "R2 OFF"
R2 = 230 V = no fault Display "R2 ON"
R4 = potential-free operating message (monitored safety relay as normally closed):
R4 = closed = furnace off Display "R4 OFF"
R4 = open = operation Display "R4 ON"
State
Matrix
Normal op-
eration
Operating
fault
"Off" via exter-
nal / internal
controller
without fault
"Off" via ex-
ternal control-
ler with fault
"Off" via con-
trol board and
therefore not
operationally
ready or
power failure
I/O button state
on control board
ON
=
ready
ON
=
ready
ON
=
ready
ON
=
ready
OFF
= not ready
State of external
controller HE on
"ON/OFF" input (if
connected)
ON
or bridged
ON
or bridged
OFF
(Display HE
OFF)
OFF
(Display HE
OFF)
ON or OFF
irrelevant
There is a fault or
the unit is not
ready
NO
YES
NO
YES
YES or NO ir-
relevant, be-
cause not
ready = fault
Voltage
Output R1
230 V
230 V
0 V
0 V
0 V
Voltage
Output R2
230 V
0 V
230 V
0 V
0 V
State
Output R4 (nor-
mally closed)
Open
Open
Closed
Closed
Closed
Note:
I/O button on the control board has highest priority = "Furnace emergency switch!" for the wodtke
Pellet Primärofen.
52


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