7 Electrical Connections
20
7
Electrical Connections
7.1.
Mains Supply
Connect the power cord plug to a grounded power socket. The IEC mains connector 31) on the
rear side of the testo ASET15-1 case includes the mains switch 30). The fuse holders 28) and
29) for integrated testo MD19-3E Rotating Disk Diluter and testo ASET15-1 itself are located on
the rear side of the laboratory case, besides the mains switch / mains connector. The one phase
power cord delivered with the instrument is equipped with a country-specific plug and protective
earth.
Mains supply voltage:
90 ... 240 VAC, 50/60 Hz, max. 600 VA
Fuse type testo MD19-3E:
slow switching fuse 250
V, 5
A, t, 5 x 20 mm
Fuse type testo ASET15-1:
slow switching fuse 250
V, 5
A, t, 5 x 20 mm
Warning
In case of a blown fuse, replace it only with the specified type of fuse. If the fuse is
repeatedly blown, the dilution unit must be sent to the manufacturer or to an
instructed service station for checking and repair.
Electric Shock
Make sure that the protecting ground pin of the country specific plug is correctly
connected to the protecting ground contact of your socket. If the plug is replaced,
ensure the yellow/green ground wire of the cable is properly connected to the new
ground pin or the case is otherwise connected to protective earth which is usually
indicated by the
sign.
7.2.
Analog/Digital Interface
The 25 pole D-Sub connectors at the rear side of the testo ASET15-1 case and the pin
assignment of the testo ASET15-1 remote interface 27) are shown in Fig. 7.1.
Fig.7.1: testo MD19-3E and testo ASET15-1 remote interfaces
The digital inputs and outputs are standard 5 V logic levels.
Digital inputs: High level: >
3.0
VDC
low level: <
0.7
VDC
The load resistance of the device is R
in
>
10
k
Ω
Digital outputs: High level: 5.0
+/-
0.2
VDC low level: <
0.7
VDC,
The source resistance of the device is R
out
<
3.5
k
Ω
The analog signals are 0...10
VDC signals.
Analog inputs: The load resistance of the device is R
in
>
1.0
M
Ω
Analog outputs:
The source current of output signals can be I
S
≤
5
mA.
D-
sub
pin
signal description
local
equivalent
or signal
analog
/
digital
in-
/
output
signal range
1
evaporation tube actual
temperature
disp. 18)
A
O
0...10
VDC =
0...400°C
2
evaporation tube temperature
setpoint
disp. 19)
A
I
0...10
VDC =
0...400°C
3
analog ground
A
0
VDC for analog
inputs
/
outputs
4
evaporation tube current I
heat
too high
LED 14)
D
O
0
VDC: OK 5
VDC: I
heat
too high
