Carel heaterSteam - Steam Production Control Signals; External Control Signal Configurations

21
ENG
“heaterSteam” +0300080EN - rel. 1.0 - 27.04.2016
4.5 Steam production control signals
The humidifi er features solid state relays (SSR) for modulating steam
production, and consequently capacity may range from 1 to 100% of output,
depending on control requirements. The humidifi er can be connected via
RS485 serial or Ethernet connection to a remote supervisor. Depending on
the type of signal used, steam production can be enabled and/or managed
in diff erent ways (ON/OFF or modulating).
Important: the probe inputs are protected against short-circuits,
and the maximum current delivered (M2.3) is 50 mA. Despite this, it is
recommended to confi gure the “Control type” before connecting the
probes to the terminals.
To help users confi gure the unit, a screen index is shown at the top right of the
display. The screen index corresponds to the sequence in each menu in order
to reach the specifi c page.
Screen
index
Fig. 4.n
Steam production can be started by:
HUMIDISTAT (ON/OFF operation):
• connect terminals M2.1 and M2.2 (production request) to a humidistat;
• short-circuit terminals M2.7 – M2.8 (jumper) to enable production;
• to enable ON/OFF operation, set:
Screen index Screen description Parameter
Ea01 Control type External ON/OFF signal
Ea04 Maximum production 0-100% of rated production
M2M9 M8
1 12345678212
Fig. 4.o
_________________________________________________________
HUMIDISTAT and REMOTE CONTACT (ON/OFF operation)
• connect terminals M2.1 and M2.2 (production request) to a humidistat;
• connect inputs M2.7 – M2.8 (enable) to a remote contact (e.g.: switch,
timer,...);
• to enable ON/OFF operation, set:
Screen index Screen description Parameter
Ea01 Control type External ON/OFF signal
Ea04 Maximum production 0-100% of rated production
M2M9 M8
1 12345678212
Fig. 4.p
Steam production can be enabled and controlled by:
EXTERNAL PROPORTIONAL CONTROLLER (modulating operation)
• short-circuit terminals M2.7 – M2.8 (jumper) to enable production;
• connect terminals M2.1 and M2.2 (production request) to an external
controller;
• to enable control, set:
Screen ind. Screen desc. Parameter
Ea01 Control type proportional to external signal
Ea03 Proportional band Set: Hysteresis (0-100%)
Minimum production (0-100%)
Maximum production (0-100%)
Ec01 Main probe type Select from: 0-1V, 0-10V, 2-10V, 0-20mA,
4-20mA
OUT
REF
M2M9 M8
1 12345678212
Fig. 4.q
_________________________________________________________
EXTERNAL PROPORTIONAL CONTROLLER and REMOTE CONTACT
(modulating operation)
• connect terminals M2.1 and M2.2 (production request) to a humidistat;
• connect inputs M2.7 – M2.8 (enable) to a remote contact (e.g.: switch,
timer,...);
• to enable control, set:
Screen ind. Screen desc. Parameter
Ea01 Control type proportional to external signal
Ea03 Proportional band Set: Hysteresis (0-100%)
Minimum production (0-100%)
Maximum production (0-100%)
Ec01 Main probe type Select from: 0-1V, 0-10V, 2-10V, 0-20mA,
4-20mA
OUT
REF
M2M9 M8
1 12345678212
Fig. 4.r
_________________________________________________________
EXTERNAL PROPORTIONAL CONTROLLER and REMOTE CONTACT
(modulating operation) with LIMIT PROBE
• short-circuit terminals M2.7 – M2.8 (jumper) to enable production;
alternatively connect terminals M2.7 – M2.8 to a remote contact (e.g.:
switch, timer,...);
• connect terminals M2.1 and M2.2 (production request) to an external
controller;
• connect the active limit probe to terminals M2.5, M2.3 (+12Vdc), M2.6
(GND);
• to enable control, set: