Hardware Backup - Carel heaterSteam User Manual

ENG
For applications that require continuous humidity control, a second
backup unit may be required, which is automatically activated in the
event of a malfunction on the fi rst.
The heaterSteam controller features a dedicated digital input and output
for the backup connection, so as to guarantee, via the normally-open
contact, activation of the second unit.
backup IN/OUT
unit
The hardware backup function must be activated on the menu in screen
Ee01. Screen Ee02 is used to set the unit with higher priority in the event
of simultaneous activation.
To ensure service continuity, the external signal or probes must be
connected to both units; in this way, both the main unit and the backup
unit will be completely independent. If using autonomous control
with probes, it is recommended to use dedicated probes for each unit
(main probe and limit probe), in other words, do not share the probes
between the units. This will guarantee service even in the event of probe
malfunctions.
Note: the hardware backup function is managed on the
heaterSteam titanium version.
"heaterSteam" +0300080EN - rel. 1.0 - 27.04.2016

10. HARDWARE BACKUP

Hardware
backup
backup
Fig. 10.a
Fig. 10.b
Connection between two units for the hardware backup function:
terminal function
M9.1 Backup and rotation contact common
M9.2 Backup and rotation contact (NO)
M2.2 GND
M2.4 Backup / rotation digital input
Legenda:
M9.1 M2.2
M9.2 M2.4
M2.2 M9.1
M2.4 M9.2
Unit 1 Unit 2
46
Tab. 10.f