109
8020216/19YN/V3-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | DUSTHUNTER SP100 Ex-3K
Subject to change without notice
MAINTENANCE
12
12.7.2
Replacing the Ex power supply unit
Replacement criterion: In case of damage.
Ex-condition:
Replacement can be carried out in the Ex-area when the absence
of an explosive atmosphere has been verified with a gas warning
device.
Take suitable measures to prevent dust from entering the control
unit enclosure when the door is open.
Work steps:
1
Disconnect the entire device (control unit and sender/receiver unit) from the power
supply.
2
Make sure that the environment allows the door of the control unit to be opened and
open it after the waiting time has elapsed.
3
Open the MCUDH with the control cabinet key.
4
Loosen three nuts (
) and remove transparent protective cover (
).
5
Disconnect power plug (
) and DC plug (
) from the power supply unit.
6
Use a screwdriver to unlock hat rail lock
of the power supply unit (pull the black plastic
latch downwards) and remove the power supply unit from the hat rail.
7
Plug the new power supply unit onto the hat rail.
8
Connect power plug (
) and DC plug (
) to the power supply unit.
9
Place protective cover
on the three stud bolts and fasten it again with nuts
.
10
Close the MCUDH Ex-3K with the control cabinet key.
11
Put the complete device back into operation (switch on voltage and check measured and
status values).
Fig. 62: Replacing the MCUDH Ex-3K power supply unit
Nuts, protective cover
Protective cover (transparent)
Power plug
DC plug
5
Hat rail lock
