en
25
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
External load
This function is used for switching an additional external load (e.g. immersion heat-
er, heat pump), if enough power for its operation is available.
Opt. functions / Add new function / Load ext.
Adjustment channel
Description
Adjustment range /
selection
Factory setting
Min.on
Minimum switch-on time 10 … 1800 s
10 s
Min.off
Minimum switch-off time 10 … 1800 s
10 s
Power
Power external load
0 … 9999 W
3000 W
Tolerance
Power tolerance
0 … 100 %
2 %
Monitoring
Monitoring time
10 … 600 s
30 s
Funct.
Activation / Deactivation Activated, Deactivated Activated
Save function / Delete
function
Save / Delete function
-
-
In normal operation, the control unit operates in modulating mode. If the power
consumption of the control unit (at maximum power + excess) exceeds the power
consumption of the external load, the external load switches on. The parameter
Power can be used for adjusting the power consumption of the load. An adjustable
tolerance can additionally be added.
Switch-on condition of the external load in normal operation:
Power of control unit + excess > power + power x tolerance
The switch-on condition has to be fulfilled for the adjusted monitoring time. The
external load is switched on for the adjustable minimum switch-on time. After
switching off, the external load remains switched off for the adjustable minimum
switch-off time. The external load switches off, if the excess falls below 0 during
the monitoring time.
The external load is switched via relay 3 by means of an auxiliary relay, see page 9.
Note:
This function is only available, if the variant Module has been selected in
the Measuring unit menu.
External load 2
If the external load function has been activated, it is offered a second time
(Load ext. 2). This function works like External load and is used for switching
higher power values. External load 2 has priority over the control unit and the
external load.
Opt. functions / Add new function / Load ext. 2
Adjustment channel
Description
Adjustment range / selection Factory setting
Min.on
Minimum switch-on time 10 … 1800 s
10 s
Min.off
Minimum switch-off time 10 … 1800 s
10 s
Power
Power external load
0 … 9999 W
6000 W
Tolerance
Power tolerance
0 … 100 %
2 %
Monitoring
Monitoring period
10 … 600 s
30 s
Funct.
Activation / Deactivation Activated, Deactivated
Activated
Save function / Delete
function
Save / Delete function
-
-
Switch-on condition of the external load 2 in normal operation:
Power of control unit + power of external load + excess > power + power x
tolerance
The external load 2 is switched via relay 2 by means of an auxiliary relay, see page 9.
Note:
This function is only available, if the variant Module has been selected
in the Measuring unit menu and if the external backup heating is not
activated.
Summary of Contents for tubra-eTherm
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