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11.3.1 Connections on the main-
board
11.3.1.1 Customer-side interfaces
Inputs
ST08:
•
05: control signal input 0...10 VDC
•
06: control signal input 0...20 mA
•
07: control signal input 0...140
Ω
•
08: digital input „Start cooling“ (12
VDC)
Outputs
ST03:
•
Potentialfree NC and NO contacts of
the basic relay. Ex-factory assignment
of the basic relay is „collective fault“.
The assignment can be changed to an
other signalling or switching function by
programming the relevant parameter
ST10.1/ST10.2:
•
Connections for a pair of optionally
orderable relays K20/K21 (ST10.1) and
K22/K23 (ST10.2) each in DIN rail ver-
sion with wiring harness, usually freely
assignable. When a 4-load or a com-
bined system was ordered, K20 and
K21 are part of the delivery. K20 is then
used in exhaust air cooling mode for
the control of the „cooling“ valve, in the
supply air humidification mode for
switching of the 4
th
load. K21 is freely
assignable. In units with a switched by-
pass valve, the valve is controlled by
relay K21.
ST07:
•
Control output for driving the frequency
converter (0...10 VDC)
ST08:
•
03: +20 VDC supply (max. 20 mA)
USB:
•
Connection for USB stick for use as a
data logger and for parameter or soft-
ware updates
11.3.1.2 System-side interfaces
ST1:
•
4-pin plug connection for the connec-
tion of L1 and N and the interlock
(safety) system, looped via ST1.2 of
the expansion board
ST11.1:
•
+12 V, GND, CAN-Bus
Inputs
ST09:
•
(0-I): plug monitoring (12 VDC)
•
(14): temperature 50 °C (5 VDC)
•
(16): pump temperature (5 VDC)
ST04-B:
•
Pressure switch in water inlet
Outputs
ST04-A:
•
9/NMain contactor (230 VAC)
ST05:
•
10/N:Flush valve (230 VAC)
ST06:
•
11/N: 2
nd
load
ST10.1:
•
20/C: Relay K20 connection for 4
th
load
in case of supply air humidification or
exhaust cooling in case of combined
systems
Bi-directional
ST12.1:
•
Serial interface for touch screen con-
nection
•
ST 13:
•
Base for adapter board with RS485
interface