6.15 X19, Bb Contact, DC Bus Short Circuit Control
Risk of fire caused by the "sacrificing behav‐
ior" of the ZKS stage!
The "ZKS" input activates the function "DC bus short circuit", when there
hasn't any voltage been applied and when there isn't any current flowing to
the input. This status occurs both in the case of wire break and when the 24V
supply fails.
When the 24V supply fails in applications in which energy does not only get
to the DC bus via the mains connection, but also via regeneratively operated
motors (e.g. following-on rollers), the ZKS stage converts this energy into
heat until it is destroyed ("sacrificing behavior").
Counter measures with such applications:
Buffer the 24V supply (e.g. by means of a UPS) to evaluate the monitor and
switch off the energy flow in the case of error.
View Connec‐
tion
Signal name Function
1 _____
ZKS1
Controls the ZKS stage:
● ZKS active
/ZKS1: n.c.
● ZKS not active
– /ZKS1: Connected to 24 V and
– /ZKS2: Connected to 0 V
2 _____
ZKS2
3 Bb1 N/O contact signals readiness for connecting the external
mains contactor
Closed with:
Readiness for operation of supply unit
Open with:
● Error messages F2800 to F2899
● Error messages F8069 and F8070
● Warnings E2800 to E2899
4 Bb2
5 n. c.
6 n. c.
7 n. c.
8 n. c.
DC bus short circuit input:
Spring terminal (connector) Unit Min. Max.
DOK-INDRV*-HCQ-T+HMQ-T-PR03-EN-P
Rexroth IndraDrive Drive Controllers HCQ, HCT
Bosch Rexroth AG 75/145
Electrical Connection Points
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