User Manual

Installation
54
08/04 AWB2528-1423GB
If inductive loads are not suppressed, the following applies:
Several inductive loads should not be switched off
simultaneously to avoid overheating the driver blocks in the
worst possible case. If in the event of an emergency stop the
+24 V DC power supply is to be switched off by means of a
contact, and if this would mean switching off more than one
controlled output with an inductive load, then you must
provide suppressor circuits for these loads (a following
diagrams).
Figure 31: Inductivity with suppressor circuit
Behaviour with short-circuit/overload
Should a short circuit or overload occur on a transistor
output, this output will switch off. The output will switch on
up to maximum temperature after the cooling time has
elapsed. This time depends on the ambient temperature and
Caution!
Outputs may only be connected in parallel within a group
(Q1 to Q4 or Q5 to Q8, S1 to S4 or S5 to S8), such as Q1
and Q3 or Q5, Q7 and Q8. Outputs connected in parallel
must be switched at the same time.
Caution!
Please note the following when switching off inductive
loads:
Suppressed inductive loads cause less interference in the
entire electrical system. For optimum suppression the
suppressor circuits are best connected directly in the
proximity of the inductive load.
+ 24 V H
Q., S.
U
emax
< U
Z
< 33 V
0 V H
Q., S.