AMALGAMATED INSTRUMENT RM4-AI Guide

Model RM4-AI
DIN Rail Process Monitor/Controller
Inputs from 0 to 5 Amps
True RMS display
Operation and Instruction Manual
AMALGAMATED INSTRUMENT CO ABN: 80 619 963 692
NSW 2077 Australia Facsimile: +61 2 9476 2902 Internet: www.aicpl.com.au

1 Introduction
1.1 General description
This manual contains information for the installation and operation of the RM4-AI Din rail moni-
tor/controller. The RM4 is a general purpose instrument which may be configured to accept inputs
of 0 to 5 Amps. For larger AC currents a current transformer can be used to with the instrument
then scaled to represent the larger current or in any engineering units. The RM4-AI displays in
true RMS. A user selectable “DC” link allows the DC components of a waveform to be taken into
account in the true RMS calculation or ignored. This “DC” link also allows the input to be 0-5A
DC rather than AC.
One standard inbuilt relays provide alarm/control functions. Two separate sets of calibration
scaling values can be stored with the display choice being made via the remote input.
Various combinations of one or two optional extra relays, analog (4-20mA, 0-1V or 0-10V) retrans-
mission/PI control or serial (RS232, RS485 or RS422) communications may also be provided as an
option. Alarms and retransmission may be set to operate from the live input value, the display
value or to follow either the tare, peak hold, display hold, peak memory or valley memory remote
input operations.
Unless otherwise specified at the time of order, your RM4 has been factory set to a standard
configuration. Like all other RM4 series instruments the configuration and calibration is easily
changed by the user. Initial changes may require dismantling the instrument to alter PCB links,
other changes are made by push button functions.
Full electrical isolation between power supply, input voltage or current and optional retransmission
output is provided by the RM4, thereby eliminating grounding and common voltage problems.
This isolation feature makes the RM4 ideal for interfacing to computers, PLCs and other data
acquisition devices.
The RM4 series of DIN Rail Process Modules are designed for high reliability in industrial appli-
cations. The 5 digit LED display provides good visibility, even in areas with high ambient light
levels. A feature of the RM4 units is the programmable display brightness function, this allows the
unit to be operated with low display brightness to reduce the instrument power consumption and
to improve readability in darker areas. To reduce power consumption in normal use the display
can be programmed to automatically dim or blank after a set time, the display will return to its
normal brightness level if any of the pushbuttons are pressed or if an alarm relay is activated.
1.2 Standard outputs
•One standard inbuilt relays provides an alarm/control function
(can be set for on/off alarm/control or PI control using pulse width or frequency control)
RM4AIMAN-2.1-0 3 of 46

1.3 Output options
•1 or 2 extra relays (not configurable for PI control)
•Dual output transistor switched 24VDC (non isolated).
•Isolated 12 bit analog retransmission (single or dual analog output versions available) config-
urable for 4–20mA., 0–1V or 0–10V. The first analog output is configurable for retransmission
or PI control.
•Isolated 16 bit analog retransmission configurable for retransmission or PI control plus extra
relay
•12VDC or 24VDC (link selectable) isolated transmitter supply/excitation voltage (25mA
max.).
•Isolated RS232, RS485 or RS422 serial communications (8 bit ASCII or Modbus RTU)
•Isolated Optional outputs are available in certain combinations e.g. Analog output plus
isolated transmitter supply.
4 of 46 RM4AIMAN-2.1-0

2 Mechanical installation
The instrument is designed for DIN rail mounting. The instrument clips on to 35mm DIN standard
rails (EN50022). Cut the DIN rail to length and install where required. To install the instrument
simply clip onto the rail as shown below. To remove the instrument lever the lower arm downwards
using a broad bladed screwdriver to pull the clip away from the DIN rail.
44mm
91mm
141mm
4
3
2
I
Rail
RM4AIMAN-2.1-0 5 of 46

3 Electrical installation
The RM4 Meter is designed for continuous operation and no power switch is fitted to the unit. It
is recommended that an external switch and fuse be provided to allow the unit to be removed for
servicing. The terminal blocks allow for wires of up to 2.5mm2to be fitted for power supply and
relays 1 and 2 or 1.5mm2for input connections and optional outputs. Connect the wires to the
appropriate terminals as indicated below.
Refer to connection diagrams provided in this manual to confirm proper selection of voltage, polarity
and input type before applying power to the instrument. When power is applied the instrument
will cycle through a display sequence, indicating the software version and other status information,
this indicates that the instrument is functioning. Acknowledgement of correct operation may be
obtained by applying an appropriate input to the instrument and observing the resultant reading.
Note that the power supply type is factory configured. Check power supply type before connecting.
Relay outputs are voltage free contacts.
6 of 46 RM4AIMAN-2.1-0

Check power supply type before connecting. Relay outputs are voltage free contacts.
3.1 Remote input connections
4
3
2
I
Remote
input
Choose momentary or
latching switch to
suit function selected.
The selected remote input function can be operated via an external contact closure via a switch,
relay or open collector transistor switch.
RM4AIMAN-2.1-0 7 of 46

3.2 Configuring the input board
Remove the circuit board from the case following the instructions below. Link settings for the main
input board are as shown below. For optional output link settings consult the separate “RM4 DIN
Rail Meter Optional Output Addendum” booklet.
The DC link allows selection of 0-5A DC input or allows any DC component on an AC waveform
to be included in the true RMS measurement. With the link out any DC components on the input
will be ignored.
8 of 46 RM4AIMAN-2.1-0

4 Function tables - summary of setup functions
Note: the order in which the functions appear on the display may not be exactly as shown below.
The availability and order of functions is determined by choice of function settings and options
fitted.
Functions in this first table are available in FUNC or CAL mode
Display Function Range Default Your
record
Ref/Page
Ax.SP PI relay control setpoint Any display
value
0See
4.1
7.2 /46
AxLo Low setpoint value for
designated alarm relay x
Any display
value or OFF
OFF See
4.1
5.2 /15
AxHi High setpoint value for
designated alarm relay x
Any display
value or OFF
OFF See
4.1
5.3 /16
AxHY Hysteresis value for the
designated alarm relay x.
0to 9999 10 See
4.1
5.4 /17
Axtt Trip time delay for the
designated alarm relay x.
0to 9999 0 See
4.1
5.5 /17
Axrt Reset time delay for the
designated alarm relay x.
0to 9999 0 See
4.1
5.6 /18
Axn.o
or
Axn.c
Alarm relay xaction to
normally open (de-energised) or
normally closed (energised)
Axn.o or
Axn.c
Axn.o See
4.1
5.7 /18
AxSP
or
Axt1
etc.
Relay operation independent
setpoint or trailing setpoint
(∗Optional)
AxSP or
Axt1 etc.
AxSP See
4.1
5.8 /18
brGt Display brightness level 1to 15 15 5.9 /19
duLL Display remote brightness
switching
0to 15 1 5.10 /19
d.oFF
SECS
Auto display dimming timer 0to 9999 0 5.11 /19
(∗Optional)—this function will only be accessible if the relevant option is fitted
Functions in this second table are available only in CAL mode or if ACCS is set to ALL
Display Function Range Default Your
record
Ref/Page
A1
OPEr
Relay operation mode, alarm or
PI control
A1 AL or
A1tP or
A1Fr
A1 AL See
4.1
5.12 /20
REC_ Analog output option low
display value (∗Optional)
Any display
value
05.13 /20
(∗Optional)—this function will only be accessible if the relevant option is fitted
RM4AIMAN-2.1-0 9 of 46

REC~ Analog output option high
display value (∗Optional)
Any display
value
1000 5.14 /20
REC_
Ch2
Second analog output option
low display value (∗Optional)
Any display
value
05.15 /21
REC~
Ch2
Second analog output option
high display value (∗Optional)
Any display
value
1000 5.16 /21
drnd Display rounding 1to 5000 1 5.17 /21
dCPt Decimal point 0,0.1 etc. 05.18 /21
FLtr Digital filter 0to 8 2 5.19 /22
rec
ctrI
Analog output PI control
(∗Optional)
on or OFF OFF 5.20 /22
CAL1 First live input calibration
scaling point
Any display
value
n/a 5.21 /22
CAL2 Second live input calibration
scaling point
Any display
value
n/a 5.22 /22
CAL
OFSt
Calibration offset Any display
value
n/a 5.23 /23
ZERO
RNGE
Zero range limit Any display
value or OFF
OFF 5.24 /23
CAL
ZERO
Zero reference point for ZERO
RNGE operation
n/a n/a 5.25 /23
USER
En4
n/a n/a n/a 5.26 /23
USER
En20
n/a n/a n/a 5.27 /23
UCAL Uncalibrate n/a n/a 5.28 /24
Pbut Pbutton function (for
instruments with front P
button)
NONE, Hi,
Lo, HiLo,
tARE or
ZERO
NONE 5.29 /24
R.INP Remote input (external input)
one function
NONE,
P.HLd,
d.HLd, Hi,
Lo , HiLo,
tARE, ZERO,
SP.Ac,
No.Ac, CAL.S
or duLL
NONE 5.30 /25
ACCS Access mode OFF, EASY,
NONE or ALL
OFF 5.31 /26
SPAC Setpoint access mode A1, A1-3 etc. A1 5.32 /26
SQrt Square root mode on or OFF OFF 5.33 /27
(∗Optional)—this function will only be accessible if the relevant option is fitted
10 of 46 RM4AIMAN-2.1-0

A1, A2
etc.
Alarm relay operation mode LiuE, tARE,
P.HLd,
d.HLd, Hi,
Lo or dISP
LiuE See
4.1
5.34 /27
rEC Analog operation mode
(∗Optional)
LiuE, tARE,
P.HLd,
d.HLd, Hi,
Lo or dISP
LiuE 5.35 /28
REC2 Second analog operation mode
(∗Optional)
LiuE, tARE,
P.HLd,
d.HLd, Hi,
Lo or dISP
LiuE 5.36 /29
Lo
dISP
Low overrange visual warning
limit value
Any display
value or OFF
OFF 5.37 /29
HIGH
dISP
High overrange visual warning
limit value
Any display
value or OFF
OFF 5.38 /29
dISP Display visual warning flashing
mode
FLSH or
-or-
FLSH 5.39 /29
bAUd
RAtE
Baud rate for serial
communications (∗Optional)
300, 600,
1200, 2400,
4800, 9600,
19.2 or 38.4
9600 5.40 /30
PrtY Parity for serial communications
(∗Optional)
NONE, EUEN
or odd
NONE 5.41 /30
O.Put Output for serial
communications (∗Optional)
dISP, Cont,
POLL,A.buS
or M.buS
Cont 5.42 /30
Addr Instrument address for serial
communications (∗Optional)
0to 31 0 5.43 /31
SERL Serial mode for serial
communications (∗Optional)
LiuE, tARE,
P.HLd,
d.HLd, Hi,
Lo, HiLo or
dISP
LiuE 5.44 /31
(∗Optional)—this function will only be accessible if the relevant option is fitted
RM4AIMAN-2.1-0 11 of 46

4.1 Relay table
Record your relay settings in the table below. Note: relay 2 is not available, relays 3 and 4 are
optionally fitted.
Display Relay 1 Relay 2 Relay 3 Relay 4
AxLo n/a
AxHi n/a
AxHY n/a
Axtt n/a
Axrt n/a
Axn.o or Axn.c n/a
AxSP or Axt1 etc. n/a n/a
A1, A2 etc. n/a
AxOPEr n/a n/a n/a
Ax.SP n/a n/a n/a
ctrI SPAN n/a n/a n/a
Ax.PG n/a n/a n/a
Ax.IG n/a n/a n/a
Ax.IL n/a n/a n/a
Ax.IH n/a n/a n/a
Ax.bs n/a n/a n/a
Ax.dc n/a n/a n/a
Ax.dr n/a n/a n/a
12 of 46 RM4AIMAN-2.1-0

5 Explanation of functions
The RM4 setup and calibration functions are configured through a push button sequence. The
push buttons located at the front of the instrument are used to alter settings. Two basic access
modes are available:
FUNC mode (simple push button sequence) allows access to commonly set up functions such as
alarm setpoints.
CAL mode (power up sequence plus push button sequence) allows access to all functions including
calibration parameters.
Once CAL or FUNC mode has been entered you can step through the functions, by pressing and
releasing the Fpush button, until the required function is reached. Changes to functions are made
by pressing the or push button (in some cases both simultaneously) when the required function is
reached. See the flow chart example on the following page.
P
P
F
F
P F
P PF F
Entering ModeCAL Entering ModeFUNC
1. Remove power from
the instrument. Hold in the
button and reapply power.
The display will indicate
as part of the
"wake up messages" when
the message is seen
you can release the
button.
2. When the "wake up"
messages have finished
and the display has settled
down to its normal reading
press, then release the
button.
1. When the "wake up"
messages have finished
and the display has settled
down to its normal reading
press, then release the
button.
3. Within 2 seconds of
releasing the button
press, then release
the and buttons
together. The display will
now indicate followed
by the first function.
2. Within 2 seconds of
releasing the button
press, then release
the and buttons
together. The display will
now indicate followed
by the first function.
^
^
^^
FUNC
FUNC
F
F
F
FF
CAL
CAL
Note: If step 1 above has been completed then the
instrument will remain in this mode state until
power is removed. i.e. there is no need to repeat step 1
when accessing function unless power has been removed.
CAL
No special power up procedure
is required to enter mode.FUNC
RM4AIMAN-2.1-0 13 of 46

Example: Entering FUNC mode to change alarm 1 high function A1Hi from OFF to 100
F U N C
F U N C End
A1Hi OFF
100
Press & release
Press & release Press & release
Press & release
Press & release F
^until
FP For until
Funtil
then press ^v
Example: Entering CAL mode to change decimal point function dCPt from 0to 0.02
F U N C
F U N C End
dCPt
CAL
0
.0 0 2
Press & release
Press & release Press & release
Press & release
Press & hold Release
Hold
Press & release F
^until
FP For until
Funtil
FF
Funtil
then press ^v
Switch off
instrument
Switch on
instrument
Easy alarm relay adjustment access facility
The display has an easy alarm access facility which allows access to the alarm setpoints simply
by pressing the Fbutton at the front of the instrument. The first setpoint will then appear
and changes to this setpoint may be made to this setpoint via the ^or vbuttons. Press the
Fbutton to accept any changes or to move on to the next setpoint. Note: this easy access also
functions in the same manner for the PI control setpoint (relay and/or analog PI output) if PI
control is available. The instrument must be set in the manner described below to allow the easy
access facility to work:
1. The R.INP function must be set to SPAC or the ACCS function must be set to EASY.
2. At least one alarm must have a setpoint, nothing will happen if all the alarm setpoints are
set to OFF.
3. The SPAC function must be set to allow access to the relays required e.g. if set to A1-2
then the easy access will work only with alarm relays 1 and 2 even if more relays are fitted.
4. The instrument must be in normal measure mode i.e. if the instrument is powered up so that
it is in CAL mode then the easy access will not function. If in doubt remove power from the
instrument, wait for a few seconds then apply power again.
5. If the easy access facility is used then the only way to view or alter any other function
settings is to power up via CAL mode i.e. there is no entry to FUNC mode functions unless
the instrument is powered up in CAL mode.
Note that relay 2 is not available in this instrument.
14 of 46 RM4AIMAN-2.1-0

Explanation of Functions
5.1 PI relay control setpoint
Display: Ax.SP
Range: Any display value
Default Value: 0
The control setpoint is set to the value in displayed engineering units required for the control
process. The controller will attempt to vary the control output to keep the process variable at the
setpoint. Note that the control setpoint value can be reached and adjusted via the “easy access”
mode (see “Explanation of functions” chapter) if the ACCS function is set to EASY. This feature
could be useful if the setpoint is to be frequently changed.
Process above
setpoint
Process below
setpoint
Process at
setpoint
SETPOINT
PROCESS
TIME
Note that in this instrument only relay 1 is available for PI control.
5.2 Alarm relay low setpoint
Display: AxLo
Range: Any display value or OFF
Default Value: OFF
Displays and sets the low setpoint value for the designated alarm relay x. Note xwill be replaced
by the relay number when displayed e.g. A1Lo for relay 1. Use this low setpoint function if a
relay operation is required when the display value becomes equal to or less than the low setpoint
value. To set a low alarm value go to the AxLo function and use the ^or vpush buttons to set
the value required then press Fto accept this value. The low alarm setpoint may be disabled by
pressing the ^and vpush buttons simultaneously. When the alarm is disabled the display will
indicate OFF. If the relay is allocated both a low and high setpoint then the relay will activate
when the value displayed moves outside the band set by the low and high setpoints. The value at
which the relay will reset is controlled by the AxHY function.
Example:
If A1Lo is set to 10 then relay 1 will activate when the display value is 10 or less.
RM4AIMAN-2.1-0 15 of 46

Display Value
Time
A Lox
A HYxvalue
A Lo
A HY
x
x
plus
Relay
activates
at this value
or below
Relay
resets
above this
value
Alarm low operation with hysteresis
5.3 Alarm relay high setpoint
Display: AxHi
Range: Any display value or OFF
Default Value: OFF
Displays and sets the high setpoint value for the designated alarm relay x. Note xwill be replaced
by the relay number when displayed e.g. A1Hi for relay 1. Use this high setpoint function if a
relay operation is required when the display value becomes equal to or more than the low setpoint
value. To set a high alarm value go to the AxHi function and use the ^or vpush buttons to
set the value required then press Fto accept this value. The high alarm setpoint may be disabled
by pressing the ^and vpush buttons simultaneously. When the alarm is disabled the display
will indicate OFF. If the relay is allocated both a low and high setpoint then the relay will activate
when the value displayed moves outside the band set by the low and high setpoints. The value at
which the relay will reset is controlled by the AxHY function.
Example:
If A1Hi is set to 100 then relay 1 will activate when the display value is 100 or higher.
Display Value
Time
A Hix
A Hi
A HY
x
x
minus Relay
activates
at this value
or above Relay
resets
below this
value
A HYxvalue
Alarm high operation with hysteresis
16 of 46 RM4AIMAN-2.1-0

5.4 Alarm relay hysteresis (deadband)
Display: AxHY
Range: 0to 9999
Default Value: 10
Displays and sets the alarm relay hysteresis limit for the designated relay x. Note xwill be replaced
by the relay number when displayed e.g. A1HY for relay 1. To set a relay hysteresis value go to the
AxHY function and use the ^or vpush buttons to set the value required then press Fto accept
this value. The hysteresis value is common to both high and low setpoint values. The hysteresis
value may be used to prevent too frequent operation of the relay when the measured value is rising
and falling around setpoint value. e.g. if A1HY is set to zero the alarm will activate when the
display value reaches the alarm setpoint (for high alarm) and will reset when the display value falls
below the setpoint, this can result in repeated on/off switching of the relay at around the setpoint
value.
The hysteresis setting operates as follows: In the high alarm mode, once the alarm is activated
the input must fall below the setpoint value minus the hysteresis value to reset the alarm. e.g. if
A1Hi is set to 50.0 and A1Hy is set to 3.0 then the setpoint output relay will activate once the
display value goes to 50.0 or above and will reset when the display value goes below 47.0 i.e. at
46.9 or below. In the low alarm mode, once the alarm is activated the input must rise above the
setpoint value plus the hysteresis value to reset the alarm. e.g. if A1Lo is to 20.0 and A1Hy
is set to 10.0 then the alarm output relay will activate when the display value falls to 20.0 or
below and will reset when the display value goes above 30.0 i.e at 30.1 or above. The hysteresis
units are expressed in displayed engineering units.
Example: If A1Hi is set to 100 and A1HY is set to 10 then relay 1 will activate when the
display value is 100 or higher and will reset at a display value of 89 or lower.
5.5 Alarm relay trip time
Display: Axtt
Range: 0to 9999
Default Value: 0
Displays and sets the alarm trip time in seconds. The trip time is common for both alarm high and
low setpoint values. The trip time provides a time delay before the alarm relay will activate when
an alarm condition is present. The alarm condition must be present continuously for the whole trip
time period before the alarm will activate. If the input moves out of alarm condition during this
period the timer will reset and the full time delay will be restored. This trip time delay is useful
for preventing an alarm trip due to short non critical deviations from setpoint. The trip time is
selectable over 0to 9999 seconds. To set a trip time value go to the Axtt function and use the
^or vpush buttons to set the value required then press Fto accept this value.
Example: If A1tt is set to 5seconds then the display must indicate an alarm value for a full 5
seconds before relay 1 will activate.
RM4AIMAN-2.1-0 17 of 46

5.6 Alarm relay reset time
Display: Axrt
Range: 0to 9999
Default Value: 0
Displays and sets the alarm reset delay time in seconds. The reset time is common for both alarm
high and low setpoint values. With the alarm condition is removed the alarm relay will stay in
its alarm condition for the time selected as the reset time. If the input moves back into alarm
condition during this period the timer will reset and the full time delay will be restored. The reset
time is selectable over 0to 9999 seconds. To set a reset time value go to the Axrt function and
use the ^or vpush buttons to set the value required then press Fto accept this value.
Example: If A1rt is set to 10 seconds then the resetting of alarm relay 1 will be delayed by 10
seconds.
5.7 Alarm relay normally open/closed
Display: Axn.o or Axn.c
Range: Axn.o or Axn.c
Default Value: Axn.o
Displays and sets the setpoint alarm relay xaction to normally open (de-energised) or normally
closed (energised), when no alarm condition is present. Since the relay will always open when power
is removed a normally closed alarm is often used to provide a power failure alarm indication. To
set the alarm relay for normally open or closed go to the Axn.o or Axn.c function and use the ^
or vpush buttons to set the required operation then press Fto accept this selection. Example:
If set to A1n.o alarm relay 1 will be open circuit when the display is outside alarm condition and
will be closed (short circuit across terminals) when the display is in alarm condition.
5.8 Alarm relay setpoint or trailing operation
Display: AxSP or Axt1 etc.
Range: AxSP or Axt1 etc.
Default Value: AxSP
Relay operation independent setpoint or trailing setpoint, this function will not be seen unless extra
optional relays are fitted. Each alarm relay, except relay 1 and relay 2 which is not available, may
be programmed to operate with an independent setpoint value or may be linked to operate at a
fixed difference to another relay setpoint, known as trailing operation. The operation is as follows:
Alarm 1 (AI) is always independent. Alarm 3 (A3) may be independent or may be linked to Alarm
1. Alarm 4 (A4) may be independent or may be linked to Alarm 1 or Alarm 3. The operation of
each alarm is selectable by selecting, for example, (Alarm 4) A4.SP = Alarm 4 normal setpoint
or A4.t1 = Alarm 4 trailing Alarm 1 or A4.t3 = Alarm 4 trailing Alarm 3. For trailing set
points the setpoint value is entered as the difference from the setpoint being trailed. If the trailing
setpoint is to operate ahead of the prime setpoint then the value is entered as a positive number
and if operating behind the prime setpoint then the value is entered as a negative number.
Example: With Alarm 3 set to trail alarm 1, if A1Hi is set to 1000 and A3Hi is set to 50
then Alarm 1 will activate at 1000 and alarm 3 will activate at 1050 (i.e. 1000 + 50). If Alarm
18 of 46 RM4AIMAN-2.1-0

3 had been set at -50 then alarm 3 would activate at 950 (i.e. 1000 – 50).
5.9 Display brightness
Display: brGt
Range: 1to 15
Default Value: 15
Displays and sets the digital display brightness. The display brightness is selectable from 1to 15,
where 1= lowest intensity and 15 = highest intensity. This function is useful for improving the
display readability in dark areas or to reduce the power consumption of the instrument. See also
the duLL function. To set brightness level go to the brGt function and use the ^or vpush
buttons to set the value required then press Fto accept this value.
5.10 Display remote brightness switching
Display: duLL
Range: 0to 15
Default Value: 1
Displays and sets the level for remote input brightness switching, see R.INP function. When a
remote input is set to duLL the remote input can be used to switch between the display brightness
level set by the brGt function 5.9 and the display brightness set by the duLL function. The
display dull level is selectable from 0to 15, where 0= lowest intensity and 15 = highest intensity.
This function is useful in reducing glare when the display needs to be viewed in both light and
dark ambient light levels. To set dull level go to the duLL function and use the ^or vpush
buttons to set the value required then press Fto accept this value. The d.oFF SECS function
(automatic display blanking or dulling) will also cause the duLL function to appear if the d.oFF
SECS function is enabled i.e. set to any value other than 0.
Example: With duLL set to 4and brGt set to 15 and the R.INP function set to duLL the
display brightness will change from the 15 level to 4when a switch connected to the remote input
terminals is activated.
5.11 Auto display dimming timer
Display: d.oFF SECS
Range: 0to 9999
Default Value: 0
This function allows a time to be set after which the display brightness (set by the brGt function)
will automatically be set to the level set at the duLL function. The auto dimming feature can be
used to reduce power consumption. The function can be set to any value between 0and 9999
seconds. A setting of 0disables the auto dimming. The display brightness can be restored by
pressing any of the instruments front push buttons. The display brightness will also be restored
whilst one or more alarm relays is activated. In normal display mode (i.e. not in CAL mode) there
is a 2 minute delay period after the instrument is switched on during which the automatic display
dimming will not operate. If any of the front pusbuttons are pressed during this period this 2
minute delay will be canceled.
RM4AIMAN-2.1-0 19 of 46

5.12 Alarm relay one operation mode A1 OPER
Display: A1 OPEr
Range: A1 AL or A1tP or A1Fr
Default Value: A1 AL
Alarm relay operating mode (relays 1 only) - this function allows selection of standard alarm
on/off setpoint operation (A1.AL) using the alarm functions described in this chapter or PI control
operation (A1.tP or A1.fr). To set the alarm operation mode go to the AxOPEr function and
use the ^or vpush buttons to choose the required operation then press Fto accept this value.
Refer to the “Setting up the relay PI controller” chapter 7for details of the PI control operations
and functions. Example:
With AxOPEr set to A1.fr relay 1 will operate as a PI control relay with the frequency of the
relay varying.
5.13 Analog output option low value
Display: REC_
Range: Any display value
Default Value: 0
Seen only when analog retransmission option fitted. Refer to the separate “RM4 Din Rail Meter
Optional Output Addendum” booklet supplied when this option is fitted for wiring details and link
settings. Displays and sets the analog retransmission (4–20mA, 0–1V or 0–10V, link selectable)
output low value (4mA or 0V) in displayed engineering units. To set the analog output low value
go to the REC_ function and use the ^or vpush buttons to set the required value then press
Fto accept this selection.
Example:If it is required to retransmit 4mA when the display indicates 0then select 0in this
function using the ^or vbutton.
5.14 Analog output option high value
Display: REC~
Range: Any display value
Default Value: 1000
Seen only when analog retransmission option fitted. Refer to the separate “RM4 Din Rail Meter
Optional Output Addendum” booklet supplied when this option is fitted for wiring details and link
settings. Displays and sets the analog retransmission (4–20mA, 0–1V or 0–10V, link selectable)
output high display value (20mA, 1V or 10V) in displayed engineering units. To set the analog
output high value go to the REC~ function and use the ^or vpush buttons to set the required
value then press Fto accept this selection.
Example: If it is required to retransmit 20mA when the display indicates 50 then select 50 in
this function using the ^or vbutton.
20 of 46 RM4AIMAN-2.1-0
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