6
Electrical installation
6.1
Safety
DANGER
Hazard due to unexpected starting of the machine
b
Make sure that the entire system is disconnected from the voltage supply during
all electrical installation work to prevent an unintentional start-up.
DANGER
Dangerous state of the machine
The dangerous state may not be stopped in the event of non-compliance.
b
Always connect OSSD1 and OSSD2 separately. The two OSSDs must not be con‐
nected to each other.
b
Connect the OSSDs such that the machine controller processes both signals sepa‐
rately.
Contactors connected in series must be positively guided and monitored.
DANGER
Dangerous state of the machine
The dangerous state may not be stopped in the event of non-compliance.
b
Each OSSD must only be connected to one downstream switching element.
b
If more than one switching element is required, use a suitable contact multiplier.
DANGER
Ineffectiveness of the protective device
If loads are connected to the OSSDs that do not have reverse polarity protection, a
potential difference between the 0 V connections of the loads and those of the associ‐
ated protective device could prevent the machine from being switched off in the event
of a fault.
b
Prevent the formation of a potential difference between the load and the protec‐
tive device.
b
Connect the 0 V connections of the loads and those of the associated protective
device individually and directly to the same 0 V terminal strip.
ELECTRICAL INSTALLATION
6
8012029/ZA20/2019-11-14 | SICK
O P E R A T I N G I N S T R U C T I O N S | S3000 Cold Store
59
Subject to change without notice
