34
Magtrol Load Monitoring Units LMU 212 & 217
Chapter 4 – Applications
If an error is detected, the user will have to check:
- the wiring in general (short-circuits or disconnected cables) and specially the transducer
connections and impedance (must be less than 75
Ω
),
- if the LMU supply configuration is correct (see
chapter 2.4.1
)
- the state and the rating of the LMU fuse.
If after having checked these points the problem is still present the LMU may be defective.
4.6
using b.i.t.e. signal
The load monitoring unit LMU is fitted with system testing the amplification chain of the signal
generated by the transducer. The B.I.T.E. test signal simulating a load must be calibrated when
installing the LMU (see
chapter 3.3
).
To activate the function two possibilities are available :
• connect the B.I.T.E. control input (terminal 23) to the ground (terminal 24), see
figure 4–6.
• send a "low active" CMOS/TTL compatible control signal (see following table) on the
B.I.T.E. (signal on terminal 23, ground on terminal 24):
b.i.t.e.
function
necessary
logic state
b.i.t.e. input terminals condition (23-24)
Activated
Low
"Low" level input voltage (VIL) : 0 to +0,5 VDC
Deactivated
High
"High" level input voltage (VIH) : +0,7 to +25 VDC
WARNING! hAvING AcTIvATed The b.I.T.e. fuNcTIoN,
The vARIous ouTpuTs (u
o/p
, I
o/p
ANd RelAys)
WIll No loNGeR be RepReseNTATIve of The
ReAl loAd ApplIed To The TRANsduceR.
No sAfeTy checks WIll be cARRIed ouT!
To pReveNT ANy RIsk, oNly AcTIvATe The
b.I.T.e. WheN The ApplIed loAd Is zeRo ANd
WheN The sysTem RepReseNTs No RIsk.
The b.I.T.e. fuNcTIoN musT oNly be used As A
peRIodIcAl check. do NoT hAve IT AcTIvATed
duRING NoRmAl use of The loAd moNIToRING
uNIT.
Содержание LMU 212
Страница 48: ...41 Appendix B CE Conformity Declaration...
