4. Electrical connection
Page 18
105204
– WTS-300-E - V4.1 - 20.01.2022
4.4 Connection diagram (Delivery configuration)
Electrical connections must be as shown in the diagram below.
Use cable bushes.
Make sure that cables cannot chafe.
Observe relay current rating.
In all cases use contactors for pump, compressor and heater.
Do not feed digital inputs with external voltage! Use potential-free switches.
ATTENTION => Delivery configuration
The final assignment of components to the relay outputs is set in the A parameters
(A1 to A20). See section 8.11
The assignment of components to the digital inputs is set in the A parameters (A21
to A33). See section 8.11
S
a
fe
ty
s
w
it
c
h
R
e
mot
e
s
ta
rt
c
o
o
lin
g
D
ry
p
ro
te
c
tion
h
e
a
ting
The
rmal
p
ro
te
c
tion
p
u
mp
W
a
te
r
p
re
s
s
u
re
s
w
it
c
h
The
rmal
p
ro
te
c
t.
c
o
mpr
e
s
.
R
e
lea
s
e
c
lea
n
ing
Impu
ls
e
m
ilk
p
u
mp
S
e
e
A
k
k
u
Al
a
rm
h
o
rn
(Ta
n
k
m
o
n
ito
ri
n
g
a
la
rm
)
Rob
o
t
STOP
Ac
id
d
e
te
rg
e
n
t
L1
–
Sup
pl
y
Hea
te
r
Cle
a
n
ig
p
u
m
p
Drai
n
v
a
lv
e
Bu
tt
e
rfl
y
v
a
lv
e
Al
k
a
lin
e
d
e
te
rg
e
n
t
Welba Power
pack ONLY
(8x AA)
Digital inputs
Connect digital inputs
with potential-free
contacts!
Se
n
s
o
r 1
Se
n
s
o
r 2
(o
p
ti
o
n
a
l)
In
p
u
t
4
..
2
0
m
A
G
ND
1
2
V +
/-
3V
L
e
v
e
l 2
L
e
v
e
l 1
Connection pressure sensor
GND * = capacitively decoupled from GND
If the tank housing is to be used as one of
the two level poles, this pole must be con-
nected to GND*.
L
e
v
2
Lev
1
Wa
rm
wa
te
r v
a
lv
e
L1
–
Sup
pl
y
Col
d
wa
ter
v
a
lv
e
Com
p
re
s
s
o
r
Ag
ita
to
r
