Siemens SIMATIC AFD4 Product Information page 28

Installing and connecting
2.7 Replacing AFD4 / AFD4 (FM) / AFD8 and AFS
In hazardous area Zone 2, you are permitted to disconnect a main line to an AFD4 / AFD4
(FM) / AFD8 during operation if it connects two AFD4 / AFD4 (FM) / AFD8.
Perform the following steps to replace an active field distributor:
1. Remove the 4 screws of the enclosure cover with a Phillips screwdriver.
2. Loosen the black and blue screw caps.
3. Disconnect the field devices S1 to S4 / S8.
4. Open the IP30 covers T1/T2 and disconnect the main lines.
5. Detach the grounding cable from the grounding terminal of the field distributor.
6. Replace the module.
7. Attach the grounding cable to the grounding terminal with a torque of 2.0 Nm.
8. Connect the field devices to the new AFD4 / AFD4 (FM) / AFD8.
9. Connect the main cables T1/T2 and close the IP30 covers until you hear them engage.
10.Tighten the screw caps with 1.3 Nm.
11.Place the enclosure cover on the base and tighten the 4 screws with the washers on the
enclosure with a torque of 2.4 Nm.
Replacing active field splitter AFS
Explosion hazard in Zone 2
In hazardous area Zone 2, you are not permitted to disconnect lines from an AFS during
operation.
Before you start the work, disconnect the voltage supply to the FDC 157 coupler(s).
Perform the following steps to replace an active field splitter AFS (6ES7157-0AG80-0XA0):
1. Remove the 4 screws of the enclosure cover with a Phillips screwdriver.
2. Loosen the black and blue screw caps.
3. Disconnect the line on the AFS.
4. Open the IP30 covers T1/T2 and disconnect the main lines.
5. Detach the grounding cable from the grounding terminal of the field distributor.
6. Replace the module.
7. Attach the grounding cable to the grounding terminal with a torque of 2.0 Nm.
8. Connect the line to the new AFS.
9. Connect the main cables T1/T2 and close the IP30 covers until you hear them engage.
10.Tighten the screw caps with 1.3 Nm.
11.Place the enclosure cover on the base and tighten the 4 screws with the washers on the
enclosure with a torque of 2.4 Nm.
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DANGER
Active field distributors AFD4, AFD4 (FM), AFD8 and AFS
Product Information, 02/2015, A5E03775304-AC