JFD WHE - 3, Руководство по эксплуатации и обслуживанию

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28 KI-OM-0591 Rev 3
Troubleshooting
No 24 VDC control power. Control power supply unit faulty. Check output of power supply. If it is
not 24 V on the feed with 440 V on the
supply, replace power supply unit.
Control power fuse F3 burned out. Replace.
Fault lights will not come
on. Faulty fault relays. Replace.
Burned out fault lights. Replace.
Remote and local
temperature readings
differ. The remote display is not
calibrated to the controller output. Check the bias, ratio and offset setting
on the controller and the remote
display.
Refer to the Appendix B section for the
controller for manual and details on
the controller parameter settings.
Remote analog dial not
calibrated to controller. If there is incorrect scaling between
the remote potentiometer and the
temperature controller, the pointer
knob may be loose or incorrectly
aligned. Remove the pointer, re-align and refit.
If the analogue range scale is
incorrect the bias and / or ratio of
the input on the local temperature
controller may have been
tampered with or the signal
generator may be faulty. Check that the controller settings have
not been changed and that the output
from the signal generator is within
specification.
Problem Possible Cause Solution