110
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
12
MAINTENANCE
12.7.3
Replacing the RS485 Interface module
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 Ex-3K with the control cabinet key.
4
Loosen the connecting wires on the Interface module.
5
Use a screwdriver to unlock hat rail lock (
) of the power supply unit and remove the
module. Note how the ribbon cable is laid on the module.
6
Disconnect ribbon cable connector (
).
7
Connect ribbon cable connector (
) to the new Interface module.
8
Plug the new power supply unit onto the hat rail.
9
Connect the connecting wires to the new module.
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. 63: Replacing the MCUDH Ex-3K Interface module
Hat rail lock
Ribbon cable connector