4WRA6E15-23 To check that the redundancy, is working correctly, perform a manual switch-over from the Primary CPU to the Backup CPU. This should be performed with caution, and consideration to possible impact on the process. The RCU Link Cable must NEVER be removed from the primary Processor Unit during redundant operation. Removal of the cable may cause the unit to stop. Verification of Redundant CPU Section 4 Operation 190 3BSE036351-510 A 3BSE036351-510 A 191 Section 5 Maintenance This section describes preventive and corrective maintenance measures for the AC 800M Controller together with troubleshooting procedures for both the system and individual units. Preventive Maintenance Frequency Schedule Before attempting maintenance or troubleshooting, read the Safety Summary on page 13. Failure to do so could lead to personal injury or damage to equipment. Table 25. Preventive Maintenance Frequency Schedule Frequency Equipment Procedure At regular, userdefined intervals Complete system Carry out a visual inspection of all system hardware, connectors and wiring. Check for the: • Physical damage and deterioration • Secure attachment • Condition of connectors and wiring • LED function Correct any defects. 2 Years PM8xx Internal Battery (if fitted) Change battery See Internal Battery on page 192 Replacing the Battery Section 5 Maintenance 192 3BSE036351-510 A Replacing the Battery Internal Battery The internal battery is mounted inside the PM8xx processor unit (except PM891). Since the battery is not rechargeable, it is important to exchange it on a regular basis (refer to the Maintenance Frequency Schedule for further details). For details of correct battery polarity, remove the right-hand cover from the battery housing (see Figure 63 on page 193 and Figure 64 on page 194). Specifications for the internal battery: • Type: Low-rate lithium battery, 3.6 V, 950 mAh. • Size: ANSI Size ½ AA / IEC size ½ R6 • Lithium contents: 0.3 g 5 Years SB821 External Battery (if fitted) Change battery See SB821 External Battery Unit on page 195 3 years or 400 discharge cycles SB822 Rechargeable External Battery (if fitted) Change battery See SB822 Rechargeable External Battery Unit on page 197 This topic does not apply to PM891, which does not contain internal battery. Due to the batteries being connected in parallel, it is necessary, when using the SB821 external battery, to remove the internal battery from the PM8xx in order to avoid reducing available memory back-up time. It is possible to replace the internal battery with the AC 800M Controller online. However, be sure to observe standard safe working practices at all times. Table 25. Preventive Maintenance Frequency Schedule (Continued) Frequency Equipment Procedure Section 5 Maintenance Internal Battery 3BSE036351-510 A 193 The battery must be exchanged whenever: • The PM8xx B(attery) LED flashes or is extinguished. • Multiple or extended power cuts have occurred. • Extended periods of system downtime have occurred for maintenance or malfunctions. For reasons of safety, exchange the battery only when the AC 800M is powered up. Figure 63. Right-hand Cover Removal – here shown with PM860 Cover Captive screw Internal battery holder Internal Battery Section 5 Maintenance 194 3BSE036351-510 A To exchange the internal battery: 1. Using a blade screwdriver, release the captive screw from the PM8xx and remove the right-hand cover. 2. Identify and remove the internal battery. 3. When power is re-established, ensure that the B(attery) LED is illuminated 4. Replace the PM8xx right-hand cover and tighten the screw. 5. Dispose of the run-down Lithium battery in an approved manner. Insert a serviceable battery and check that battery polarity and orientation are correct, according to the marking on the housing. Figure 64. Internal Battery Location – here shown with PM860 F R P B INIT PM860 Tx Rx CN1 CN2 COM3 COM4 + – Tx Tx Tx Rx Rx Rx battery Internal Section 5 Maintenance SB821 External Battery Unit 3BSE036351-510 A 195 SB821 External Battery Unit The external battery is mounted inside the SB821 External Battery unit. Since the battery is not rechargeable, it is important to exchange it on a regular basis (refer to the Maintenance Frequency Schedule for further details). For access to the battery and housing, remove the cover (see Figure 65 on page 196). When replacing the battery, be sure to check that polarity and orientation are correct. Specifications for the external battery: • Type: Low-rate lithium battery, 3.6 V, 16 Ah • Size: ANSI Size D / IEC R20 • Lithium contents: 5.6 g The battery must be exchanged whenever: • The PM8xx B(attery) LED flashes or is extinguished. • Multiple or extended power cuts have occurred. • Extended periods of system downtime have occurred for maintenance or malfunctions. Replacing the Battery in an SB821 External Battery Unit To replace an external battery: 1. Disconnect the SB821 unit cable connector. 2. Release the SB821 unit from the DIN-rail. 3. Carefully remove the SB821 unit cover and identify the external battery. 4. Read and comply with the Warning label/text on the external battery. 5. Carefully remove the battery. 6. Insert a serviceable battery and check that battery polarity and orientation are correct. For further battery details see SB821 External Battery – AC 800M Memory Back-up on page 392. Due to the batteries being connected in parallel, it is necessary, when using the SB821 external battery, to remove the internal battery from the processor unit in order to avoid reducing available memory back-up time. SB821 External Battery Unit Section 5 Maintenance 196 3BSE036351-510 A 7. Replace the cover, mount the unit onto the DIN rail, and reconnect the cable. 8. When power is re-established, check that the B(attery) LED lights up. 9. Dispose of the run-down Lithium battery in an app |
