27
Clip
HBMA0114-6.3 en
NOTE
Under normal operating conditions, the relays switch as described at
V
Ref
or V
Hys
respectively. With signal levels in the hysteresis range (V
Ref
- V
Hys
or V
Hys
- V
Ref
), EMC influences may cause the relays to switch
before V
Ref
or V
Hys
has been reached. Outside the hysteresis range the
switching states are always unambiguous.
• Changing the hysteresis voltage
The hysteresis voltage is 220 mV. It can be varied by changing R43 resp.
R48. The following applies:
R43 (R48) +
670 mV
kΩ
V
Hys
[mV]
• Changing the response and releasing times
The response/releasing time (t
rise
, t
fall
) is less than 5ms. It can be varied by
changing C31a/C34a and C27/C28 (max. 6.8µF). The capacitor’s dielectric
strength must be ≥35 V. The following applies:
+
18 ms
• C31a (C34a)
µF
) 3ms
t
rise
+
710 ms
• C31a (C34a)
µF
) 3ms
t
fall
w Changing the releasing time only
Change C27 (C28) to vary the relay releasing times (max. 47µF). The follow-
ing applies:
+
6ms
• C27 (C28)
µF
) 3ms
t
fall
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