EbV Product documentation THETA NORM/UNIT
8-9
8.1.8.5 Modulation starting time
The starting time parameter determines the length of the start-up phase in modulation mode so that a stable
start-up is ensured. As soon as the set starting time has expired, the modulation switches to its normal
control characteristics defined by the modulation parameters.
8.1.8.6 Modulation starting load
The starting load parameter determines a percentage setting for a fraction of the modulation running time
during the start-up phase. At a setting of 0%, the actuator valve remains closed continually during the start-
up. As soon as the set starting time has expired, the modulation switches to its normal control characteristics
defined by the modulation parameters.
Connecting THETA UNIT
If installing the THETA UNIT type, connect as follows:
• Connection burner ON to tx of burner 1 (see 12.2.3, connection 4)
• Connection modulation OPEN to tx of burner 2 (see Chapter 12.2.3, connection 5)
• Connection modulation OPEN to tx of burner 2 (see Chapter 12.2.3, connection 5)
Operation:
Note on operation Key / parameter tree Parameter
Modulation P-band Xp (%/K) HEAT GENER. PARAMETER 19
Modulation sample time Ta HEAT GENER. PARAMETER 20
Modulation I-band Tn (Reset time) HEAT GENER. PARAMETER 21
Modulation running time actuator HEAT GENER. PARAMETER 22
Modulation starting time HEAT GENER. PARAMETER 23
Modulation starting load HEAT GENER. PARAMETER 24
Start-up
Starting load (%)
Modulation
Upward modulation
Downward modulation
Adjustment
phase
t (s)
90 s
60 s
42 s
Start
On
Basic load
t (s)
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