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Free a stuck relay in molbox, ACAL error, PRT error

See the attached document to diagnose and try to free a stuck relay in molbox1, molbox1+ or molbox RFM flow terminal. It basically describes how to use the front panel buttons to cycle the relays. Note that with molbox1+ firmware version 6.01, the keys to press to enter diagnostic mode have changed. New method is to press and hold the left and right arrow keys at the same time.

A stuck relay might show as PRTERR, TIMEOUT, CALCERR, or ACALERR

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Another possibility would be that the driver board cable has come loose. This is easy to inspect by removing the top cover of a molbox1 or molbox1+ terminal. See the attached article "check back panel internal cable, molbox1+.pdf" to check this.

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If you have a problem with a single molbloc you can check it with the article at this link, Check molbloc PRT or ACAL error

Note that molbox1+ terminals shipped new since July 2017 should only get this error as a result of the back panel cable being loose, not from a relay being stuck (type of relay was changed in July 2017). 

If this procedure does not work, contact Fluke Calibration Service for a RMA number to return the molbloc element or molbox terminal for evaluation/repair. By phone at +1.877.355.3225 or the below link.

If you have technical questions contact Flow Technical Support at the same phone number or at the below link.

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