Connecting transistor outputs
65
1SVC 440 795 M1100
Parallel connection:
Up to four outputs can be connected in parallel in order to
increase the output power. This enables a maximum output
current of 2 A.
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 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 the following
diagrams).
Figure: 51: Inductive load with suppressor circuit
Caution!
Only outputs within a group (Q1 to Q4 or Q5 to Q8, S1 to
S4 or S5 to S8) can be switched in parallel; e.g. Q1 and Q3
or Q5, Q7 and Q8. Outputs switched in parallel must be
activated at the same time.
Caution!
Note the following when disconnecting 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.
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