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Troubleshooting Communication Problems in Lead/Lag Operation
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Communication problems may occur with the following conditions:
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Power Disconnection or Short Circuit.
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IO Board Trip.
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When the alternating sequence AP1-40 (Lead Lag Sel) is changed.
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When changing the Drive ID COM-01 (Int485 St ID).
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When the Drive ID COM-01 (Int485 St ID) is duplicated.
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When there is more than one Lead (+) drive (setting error).
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Example: when more drives are connected via communications than the setting in AP1-42 (* of
Pumps). If 8 drives are connected and AP1-42 is set to 5, Drive ID 6 can become a Lead drive
creating more than one Lead drive resulting in communication conflicts. Ensure AP1-42 is correct
for the number of drives connected in the Lead/Lag system.
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When AP1-79 (All CommErr) is Yes
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When communication problems occur, all Drives trip with Comm Err !! and stop.
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The first drive to clear the Comm Err !! becomes Lead (+) drive.
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When AP1-79 (All CommErr) is No
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When communication problems occur, only the drive having the problem trips on Comm Err !! and
stops.
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The remaining drives are automatically sorted in the accordance with their Drive ID and normal
Lead/Lag operation continues.
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Other conditions
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Comm Err !! is only generated after normal communication is established between Lead and Lag
drives (Lead to Lag and Lag to Lead) and when there is no response from Lag drives.
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Drives with AP1-40 (Lead Lag Sel) set to Network Fbk do not generate CommErr !!.
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When power is removed from all drives except one during normal Lead/Lag operation.
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The remaining one becomes the Lead (+) drive. Even though there is no response from Lag
drives (not powered), a Comm Err !! is not triggered.
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Comm Err !! is not triggered during normal power off.
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If only one drive is turned on, there will be no response from Lag drives (not powered), a Comm Err !!
is not triggered.
Summary of Contents for RSi H2P Series
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