Troubleshooting - Siemens SITRANS WM300 MFA Operating Instructions Manual

Troubleshooting

7.1 Troubleshooting
Operator display screen after power failure or power cycle
Following the commissioning of the SITRANS WM300 MFA, the final display is the overview
of the relay status and process variables. The F4 key or equivalent is pressed, the device will
reset back to the initial start-up display. If the F4 key is pressed, the operator can
sequentially scroll though the setup to return to the run display.
In the event of a power loss or power cycle, the remote display will repower to the last valid
display screen. If the on-board display does not reload to the setup screen, press the "ESC"
key on the base module to return to the last valid display screen.
Notes:
● If diagnosis does not solve the malfunction, the probe, pre-amp or SITRANS WM300
MFA may be defective.
– To find out if the probe is defective (non-IMA type only; i.e. MSP-3 and MSP-9):
SITRANS WM300 MFA
Operating Instructions, 08/2018, A5E45090709-AA
i. Disconnect probe from pre-amp.
ii. Connect an ohm meter across the black and white leads.
iii. Nominal probe impedances are as follows:
MSP-3 and MSP-9
If impedance deviates substantially from these values, an open or short circuit
condition is indicated.
750 ohms
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