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Sequence of phases in work mode
Work phase
Upper display
0
Process variable
1
Process variable
2
Process variable
3
Process variable
4
CT input value
5
Process variable
6
Process variable
* settable value, return to work phase 0 after 10 seconds.
Notes:
1. Work phase 0 (SP)
In normal operation, the upper display shows the process variable
(PV) (measured at input), while the lower display shows the control
setpoint. A change in setpoint takes effect immediately.
2. Work phase 1,2,3 (alarms)
Alarm 1 is always enabled. Alarms 2 and 3 depend on the value of
the brd code (in CFG2), which reflects the hardware configuration.
If one of the three alarms is configured as HB (see code A.r.F. in
CFG2) phase 4 will appear instead of phases 1,2 or 3, with the
respective LED flashing. If it is configured as LBA, the respective
phase will not appear. See Functional Notes/Alarms.
3. Work phase 4 (HB alarm)
Enabled only if the instrument has the CT input (see brd code) and
if the HB alarm is enabled (see Out code in CFG2). Signaled by
flashing of letter "A" on least significant digit of lower display. The
most significant digits display the whole value of the HB limit, while
the upper display shows the value of current in the load read by
the CT input in Ampere (resolution 0.1 Ampere). Press the Raise
or Lower key instead of letter A to see the decimal figure of the
limit that persists during the change. When the key is released, "A"
reappears after 1 second. Press F to confirm the set value and go
to the next phase. See Functional Notes/Alarms/HB Alarm.
4. Work phase 5 (CT input)
Enabled only if the instrument has the CT input (see code brd),
and is independent of the HB alarm. The lower display shows the
whole value of the load current, followed by letter "A" (steady). It
remains on the display without time limit. See Functional Notes/CT
input function.
5. Work phase 6 (POWER)
Accessible only with the AUTO/MAN function engaged (see brd
code in phase CFG.2). A detailed description of the AUTO/MAN
function may be found in Functional Notes / AUTO/MAN function.
AUTO/MAN and MAN/AUTO switching
In work phase 6, press the Raise and Lower keys simultaneously
to switch from automatic to manual. Press F to switch from manual
to automatic. ("P" steady in automatic, flashing in manual). In
manual, you can vary output power directly with the Raise and
Lower keys. See Functional Notes
Self-tuning Start/stop
Press the F and Raise keys simultaneously for 3 seconds to
activate the self-tuning procedure. The same command interrupts
the procedure. See Functional Notes / SELF-TUNlNG.
Software On/Off
Press the F and Lower keys simultaneously for 5 seconds to put
the instrument in OFF status (display off, outputs deactivated).
Press F for 5 seconds to activate the instrument. See the specific
section in Functional Notes.
80343I_MHW_1000_07-2011_ENG
6 • WORK MODE
Lower display
Control setpoint*
Alarm limit 1 *
Alarm limit 2 *
Alarm limit 3 *
Alarm limit HB *
CT input value
Auto/Man power outputn
Display of software release number
Keep the "F" key pressed for 3 seconds: the upper display will
show the message Upd and the lower display the software release
number (ex. Upd/11.0). When the key is released, the display
returns to work mode, phase 0.
Error messages and signals
Message Sbr on upper display: probe input interrupted (TC-RTD) .
Message Err on upper display: incorrect connection; probe
reversed (TC); probe in short circuit (RTD).
Message Lo on upper display: off scale low.
Messagge Hi on upper display: off scale high.
Upper display flashing: self-tuning or soft-start in progress. Upper
and lower display flashing: LBA alarm on. Two decimal points (one
only for scales with decimal point) flashing on upper display: auto-
tuning on. Decimal point flashing with display off: instrument in
software off (OFF) status.
P flashing on lower display: work phase 6 MAN mode (power
settable from faceplate keys).
P steady on lower display: work phase 6 AUTO mode (power
display in automatic).
A flashing on lower display: work phase 4 (HB alarm limit setting
A steady on lower display: work phase 5 (ammeter input display).
Led AL1, AL2, AL3 flashing: alarm limit setting phase..
Led AL1, AL2, AL3 on: alarm relay energized.
Led AL1, AL2, AL3 off: alarm relay de-energized or alarm not
enabled.
MAIN LED on: MAIN output on (MAIN relay energized, output D2
logic level 1)
MAIN LED off: MAIN output off (MAIN relay de-energized, output
D2 logic level 0)
MAIN LED flashing rapidly: continuous output (LA) on.
Power on
At power-on, the instrument runs a 5-second initialization cycle
during which the outputs are disengaged (relays de-energized, D2
and continuous outputs OFF) and all segments and LEDs on the
display flash. The instrument then goes to work phase 0 (automatic
start) or 6 (manual start). For the duration of the first cycle time,
the software filter on the signal input is disengaged.
Phase indication
Led AL1 flashing
Led AL2 flashing
Led AL3 flashing
Letter A flashing
Letter A steady
Letter P steady/flashing
Notes
Note 1
Note 2
Note 2
Note 2
Note 3
Note 4
Note 5
5
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