The standard device is produced with parameter C.I.= 8,
with sampling time of 120 msec and Eb function disabled.
The Eb function lets you detect if the probe power supply is interrupted. This function is valid for probe currents > 20mA (8mA
in version 2.0x)
Example:
- probe voltage 10V
- strain-gauge resistance 350Ω
V 10
- current = =
≅ 28mA
R 350
or for three probes connected in parallel
- probe voltage 10V
- strain-gauge resistance 350Ω
V 10 30
- corrente = = =
≅ 85mA
R 350 350
3
• Eb Function
6 • ALARMS
time
AL1 + H1
AL2 + H2
AL2
AL1
alarm 1
alarm 2
(*)
For AL1 inverse absolute alarm (min.) with positive H1, 1 t = 1
(*) = OFF if disabling on power-on exists
For AL2 direct absolute alarm (max) with negative H2, 2 t = 0
For AL1 inverse absolute, symmetrical alarm with hysteresis H1, 1 t = 5
For AL1 direct absolute, symmetrical alarm with hysteresis H1, 1 t = 4
Normal absolute alarm Symmetrical absolute alarm
inverse
direct
AL1
AL1 + [ H1 ]
AL1 - [ H1 ]
time
For AL1 direct absolute alarm (max) with negative H 1, 1 t = 0
For AL2 direct relative alarm (max) with negative H2, 2 t = 2
For AL1 direct absolute alarm (max) with negative H1, 1 t = 0
For AL2 symmetrical deviation alarm H2, 2 t = 6
time
AL1+AL2
AL1
alarm 1
alarm 2
AL1+AL2
AL1
alarm 1
alarm 2
time
AL1 + AL2 + H2
Normal deviation alarm
(AL1 absolute, AL2 relative)
Symmetrical deviation alarm
(AL1 absolute, AL2 relative)
AL1-AL2
AL1 + H1
AL1+AL2+H2
AL1+H1
The input value and alarms are frozen while the logic input is active.
With the logic input active, a reset turns OFF both the relay outputs and the alarms latch.
Input value is sampled; state of alarms is not transferred to outputs; outputs are “frozen”.
When the logic input is active the input value is “frozen” and the outputs are updated according to the calculated alarms
state, including the ones latched.
• HOLD function
• FLASH function
6
81651C_MHW_40B48-96_0308_ENG
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