Baumer BA_DACx_800 - Handbuch (Seite 16)

Baumer Electric AG 31/40 www.baumerelectric.com
Frauenfeld, Switzerland DACU/I BA V2.1M
5.4 Alarm outputs
The two alarm outputs monitor the output signal, and can be used to signal limits or to define
measurement windows.
DACU 800:
The threshold voltage of 0 – 10V can be set in two ways:
1. The threshold voltage is fed in externally via the input on pin 3 or 4
or
2. It is set after the lid is opened, using the two potentiometers L0 and L1 (see Fig. 5.3.2). Set
voltage can be measured on pin 3 or 4.
Both alarm outputs close the contact as soon as the set threshold value is exceeded, and remain set
until the next reset.
DACI 800:
Because the alarm exits are a tension-steered, the threshold voltage (0..10V) must be calculated
proportionally to the output current (4..20 mA).The threshold voltage can be set in two ways:
1. The threshold voltage is fed in externally via the input on pin 3 or 4
or
2. It is set after the lid is opened, using the two potentiometers L0 and L1 (see Fig.5.3.2). Set
voltage can be measured on pin 3 or 4.
Comment (DACU 800, DACI 800):
Two Photo-Mos relays are used as circuit elements. The outputs are galvanically separated and
suitable for AC and DC. However, they are not short-circuit-proof and must not be operated beyond the
specification. However, the Photo-Mos relays can be replaced quickly in the case of a defect
(socketed).
Baumer Electric AG 32/40 www.baumerelectric.com
Frauenfeld, Switzerland DACU/I BA V2.1M
5.5 RESET function
Because of the finite insulation resistances of the sensors, cables and electronic components, part of
the charge which the sensor outputs is lost. This means that with a constant physical measured
magnitude (e.g. force), the output signal changes in the positive or negative direction. Because of this
"drift“, static measurements can only be carried out to a limited extent or over short periods. It is
therefore necessary to reset the charge amplifier cyclically.
The charge amplifier is switched active via the Operate input.
Comment:
The charge amplifier should always be switched to "Reset“, if no measurement result is required.
5.6 PEAK function
For the duration of one measurement cycle, the peak function supplies the maximum value of the
output signal. It is reset automatically using the control input Operate.
t
t
Operate
+10V
1
0
-10V Signal out
Peak out
5.7 80% test
DACU 800:
This function makes it possible to check the measuring chain without a sensor being connected, and
can thus be used to limit errors. The amplitude is approx. 8V (80%FS).
Example:
t
t
t
Operate
+8V
1
1
0
0
-8V
80%-Test
Signal
out