AMALGAMATED INSTRUMENT LD-232 Series User manual

LD-232, LD-485 and LC-CL
Serial Input
Large Digit Display
Arithmetic and Wind Speed/Direction Addendum
AMALGAMATED INSTRUMENT CO PTY LTD ACN: 001 589 439
Unit 5, 28 Leighton Place Hornsby Telephone: [phone] e-mail: [email protected]
NSW 2077 Australia Facsimile: [phone] Internet: www.aicpl.com.au

Table of Contents
1 Introduction 3
2 Electrical installation 4
3 Function tables - Arithmetic mode 10
4 Arithmetic and Wind Speed/Direction mode functions 15
5 Arithmetic function examples 40
6 Function table - Wind Speed and Direction mode 41
7 Wind speed and direction NMEA mode 43
2 of 44 LDRSMANADD-2.3-0

1 Introduction
This addendum to the LD-232, LD-485 and LD-CL manual contains information for the installation and
operation using the arithmetic mode ARtH or the wind monitor mode NMEA. The display will accept
inputs from RS232, RS485, RS422 or serial current loop inputs (input type is factory configured). The
two modes covered by this addendum are detailed below. If the mode is changed it is necessary to remove
power from the instrument then reapply power in order to reset the mode:
Arithmetic mode. The instrument can be programmed to accept input from up to eight RS485 or RS422
sources and combine these arithmetically. The time between polling requests is programmable from 0.0
to 20.0 seconds. The instruments polled for arithmetic operation must be of the same manufacture as this
instrument. To operate in this mode the COdE function must be set to ARth.
Wind speed and direction (NMEA). This mode is used only with instruments using NMEA (National
Marine Electronics Association) serial code such as model WS-MMW-005 wind speed and direction sensor.
To operate in this mode the COdE function must be set to NMEA.
The display can be set to display wind speed, wind direction or to toggle (using ^or vbutton) or
automatically alternate the display between wind speed and direction. Analog retransmission output
options can be selected to transmit wind direction (Ch1) or wind speed (Ch2) at the REC function (also
at the REC2 function if dual analog output is used.) Similarly Ch1 or Ch2 can be selected for the alarm
relays at the A1,A2 etc. functions.
LDRSMANADD-2.3-0 3 of 44

2 Electrical installation
2.1 Electrical installation
The display is designed for continuous operation and no power switch is fitted to the unit. It is rec-
ommended that an external switch and fuse be provided to allow the unit to be removed for servicing.
The terminal blocks are plug in screw type for ease of installation and allow for wires of up to 1.5mm2
(2.5mm2for relay, AC or isolated DC supply connections) to be fitted. Connect the wires to the ap-
propriate terminals as indicated below. Refer to other details 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.
2.2 Main circuit board layout
2.3 38, 45, 57mm LED or 39mm electromagnetic display power supplies
AC power connections use a plug in connector with screw terminals at P12 (2.5mm2max. wire). Isolated
DC supplies (12-48VDC) use the same terminals. Non isolated DC supplies (24VDC only) may be con-
nected directly to the main circuit board power supply connector via the plug in connector terminals at
P11 (1.5mm2max. wire diameter). Note supply type is factory configured.
4 of 44 LDRSMANADD-2.3-0

2.4 100mm and 200mm display isolated DC power supplies
Isolated DC supplies (12 to 24VDC) for 100mm and 200mm LED and 100mm electromagnetic displays
connect to the isolated supply pcb on the base board.
Optional isolated DC supply
EIN
- -
++
Optional isolated dc board
(for use with 100mm & 200mm led
displays and 100mm
electromagnetic displays only)
++
--
CASE
EARTH
Input DC 12-24V
Output DC to
display board
2.5 100mm and 200mm display non isolated DC power supplies
Non isolated DC supplies (24VDC) for 100mm and 200mm LED and 100mm electromagnetic displays are
wired to a connector on the baseboard as shown below.
LDRSMANADD-2.3-0 5 of 44

High and low voltage AC supplies
1 2 3 4 5 6 7
BRN RED ORG BLK GRY WHT GRN/YEL
48VAC
42VAC
32/36VAC
24VAC
AN
EARTH
A
A
A
N
N
N
LINK
LINK
LINK
LINK LINK
1
1
1
2
2
2
3
3
3
4
4
4
BLU
BLU
BLU
WHT
WHT
WHT
BRN
BRN
BRN
GRN/YEL
GRN/YEL
GRN/YEL
1
1
1
1
2
2
2
2
3
3
3
3
4
4
4
4
5
5
5
5
6
6
6
6
7
7
7
7
BRN
BRN
BRN
BRN
RED
RED
RED
RED
ORG
ORG
ORG
ORG
BLK
BLK
BLK
BLK
GRY
GRY
GRY
GRY
WHT
WHT
WHT
WHT
GRN/YEL
GRN/YEL
GRN/YEL
GRN/YEL
48VAC
240VAC
Important note: the 240V & 110V supplies use the
same transformer, low voltage instruments use a
different transformer. Do not use a low voltage
transformer for 240V or 110V or vice versa.
110VAC
42VAC
32 TO
36VAC
24VAC
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
NEUTRAL
NEUTRAL
NEUTRAL
NEUTRAL
NEUTRAL
NEUTRAL
EARTH
EARTH
EARTH
EARTH
EARTH
EARTH
LINK
LINK
LINK
LINK
LINK
Black
Black RedRed
To display boardTo display board
Wiring examples 240VAC & 110VAC Wiring examples low voltage AC
240 & 110VAC supplies.
For 100mm/200mm LED or 100mm
electromagnetic display types only.
Low voltage AC supplies.
For 100mm/200mm LED or 100mm
electromagnetic display types only.
110VAC
110VAC
110VAC
N
N
N
N
N
N
A
A
A
A
A
A
EARTH
EARTH
EARTH
EARTH
EARTH
EARTH
240VAC
240VAC
240VAC
6 of 44 LDRSMANADD-2.3-0

2.6 Serial input connections
If wiring RS232 to a 9 or 25 pin D type connector the standard connections are as follows:
9 pin: Tx pin 3, Rx pin 2, GND pin 5
25 pin: Tx pin 2, Rx pin 3, GND pin 7
See note below regarding Tx and Rx crossing when wiring RS232
LDRSMANADD-2.3-0 7 of 44

2.7 Remote input and DC out connections
2.8 Relay connections
The display is supplied with two alarm relays as standard with connections on terminal P2. The relays
are single pole single throw types and are rated at 5A, 240VAC into a resistive load. The relay contacts
are voltage free and may be programmed for normally open or normally closed operation. With power
removed the relay contacts will be in closed position.
8 of 44 LDRSMANADD-2.3-0

2.9 Wiring to WS-MMW-005 wind speed and direction sensor
The WS-MMW-005 can be connected as either RS232 or RS485 (not serial current loop) use the connection
type which matches the input type of the display.
LDRSMANADD-2.3-0 9 of 44

3 Function tables - Arithmetic mode
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
A1Lo Low setpoint value for alarm relay
1
Any display
value or OFF
OFF 4.1 /16
A1Hi High setpoint value for alarm relay
1
Any display
value or OFF
OFF 4.2 /17
A2Lo Low setpoint value for alarm relay
2
Any display
value or OFF
OFF 4.3 /17
A2Hi High setpoint value for alarm relay
2
Any display
value or OFF
OFF 4.4 /17
A1HY Hysteresis value for alarm relay 1 0to 9999 10 4.5 /18
A2HY Hysteresis value for alarm relay 2 0to 9999 10 4.6 /18
A1tt Trip time delay for alarm relay 1 0to 999.9 0.0 4.7 /18
A2tt Trip time delay for alarm relay 2 0to 999.9 0.0 4.8 /19
A1rt Reset time delay for alarm relay 1 0.0 to 999.9 0.0 4.9 /19
A2rt Reset time delay for alarm relay 2 0.0 to 999.9 0.0 4.10 /19
A1n.o
or
A1n.c
Alarm relay 1 action to normally
open or normally closed
A1n.o or
A1n.c
A1n.o 4.11 /19
A2n.o
or
A2n.c
Alarm relay 2 action to normally
open or normally closed
A2n.o or
A2n.c
A2n.o 4.12 /20
A2SP
or
A2t1
Relay operation independent
setpoint or trailing setpoint
A2SP or A2t1 A2SP 4.13 /20
(∗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
brGt Display brightness level 1to 63 63 4.14 /20
brGt
AUto
Automatic display brightness
adjustment
on or OFF OFF 4.16 /21
brGt
HIGH
Automatic display brightness
adjustment - high level
1to 63 63 4.17 /21
brGt
Lo
Automatic display brightness
adjustment - low level
1to 63 1 4.18 /21
duLL Display remote brightness
switching
0to 63 15 4.15 /20
drnd Display rounding 1to 5000 1 4.19 /21
(∗Optional)—this function will only be accessible if the relevant option is fitted
10 of 44 LDRSMANADD-2.3-0

dCPt Decimal point 0,0.1 etc. 04.20 /22
FLtr Digital filter 0to 8 2 4.21 /22
AthH
CH
Number of active channels for
Arth mode
1to 8 4 4.25 /23
Ch1
Addr
Channel 1 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.26 /23
Ch2
Addr
Channel 2 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.27 /23
Ch3
Addr
Channel 3 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.28 /23
Ch4
Addr
Channel 4 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.29 /24
Ch5
Addr
Channel 5 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.30 /24
Ch6
Addr
Channel 6 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.31 /24
Ch7
Addr
Channel 7 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.32 /24
Ch8
Addr
Channel 8 address P1 to P8 or S1
to S8 or t1 to
t8
P1 4.33 /24
Ch1
dCPt
Channel 1 decimal point 0,0.1 etc. 04.34 /24
Ch2
dCPt
Channel 2 decimal point 0,0.1 etc. 04.35 /25
Ch3
dCPt
Channel 3 decimal point 0,0.1 etc. 04.36 /25
Ch4
dCPt
Channel 4 decimal point 0,0.1 etc. 04.37 /25
Ch5
dCPt
Channel 5 decimal point 0,0.1 etc. 04.38 /25
Ch6
dCPt
Channel 6 decimal point 0,0.1 etc. 04.39 /25
Ch7
dCPt
Channel 7 decimal point 0,0.1 etc. 04.40 /25
Ch8
dCPt
Channel 8 decimal point 0,0.1 etc. 04.41 /26
EA1 EA1 value for arithmetic formula -32727 to
32767
14.42 /26
(∗Optional)—this function will only be accessible if the relevant option is fitted
LDRSMANADD-2.3-0 11 of 44

Eb1 Eb1 value for arithmetic formula -32727 to
32767
04.43 /26
EC1 EC1 value for arithmetic formula -32727 to
32767
14.44 /26
EA2 EA2 value for arithmetic formula -32727 to
32767
14.45 /26
Eb2 Eb2 value for arithmetic formula -32727 to
32767
04.46 /27
EC2 EC2 value for arithmetic formula -32727 to
32767
14.47 /27
EA3 EA3 value for arithmetic formula -32727 to
32767
14.48 /27
Eb3 Eb3 value for arithmetic formula -32727 to
32767
04.49 /27
EC3 EC3 value for arithmetic formula -32727 to
32767
14.50 /27
EA4 EA4 value for arithmetic formula -32727 to
32767
14.51 /27
Eb4 Eb4 value for arithmetic formula -32727 to
32767
04.52 /28
EC4 EC4 value for arithmetic formula -32727 to
32767
14.53 /28
EA5 EA5 value for arithmetic formula -32727 to
32767
14.54 /28
Eb5 Eb5 value for arithmetic formula -32727 to
32767
04.55 /28
EC5 EC5 value for arithmetic formula -32727 to
32767
14.56 /28
EA6 EA6 value for arithmetic formula -32727 to
32767
14.57 /28
Eb6 Eb6 value for arithmetic formula -32727 to
32767
04.58 /29
EC6 EC6 value for arithmetic formula -32727 to
32767
14.59 /29
EA7 EA7 value for arithmetic formula -32727 to
32767
14.60 /29
Eb7 Eb7 value for arithmetic formula -32727 to
32767
04.61 /29
EC7 EC7 value for arithmetic formula -32727 to
32767
14.62 /29
EA8 EA8 value for arithmetic formula -32727 to
32767
14.63 /29
Eb8 Eb8 value for arithmetic formula -32727 to
32767
04.64 /30
EC8 EC8 value for arithmetic formula -32727 to
32767
14.65 /30
(∗Optional)—this function will only be accessible if the relevant option is fitted
12 of 44 LDRSMANADD-2.3-0

OP1 Arithmetic operation between
channels 1 and 2
Add,Sub,
Prod,diU,
High,Lo,
SINE,COS or
C.SUb
Add 4.66 /30
OP2 Arithmetic operation between
channel 3 and previous operation
Add,Sub,
Prod,diU,
High,Lo,
SINE or COS
Add 4.67 /30
OP3 Arithmetic operation between
channel 4 and previous operation
Add,Sub,
Prod,diU,
High,Lo,
SINE or COS
Add 4.68 /31
OP4 Arithmetic operation between
channel 5 and previous operation
Add,Sub,
Prod,diU,
High,Lo,
SINE or COS
Add 4.69 /31
OP5 Arithmetic operation between
channel 6 and previous operation
Add,Sub,
Prod,diU,
High,Lo,
SINE or COS
Add 4.70 /32
OP6 Arithmetic operation between
channel 7 and previous operation
Add,Sub,
Prod,diU,
High,Lo,
SINE or COS
Add 4.71 /32
OP7 Arithmetic operation between
channel 8 and previous operation
Add,Sub,
Prod,diU,
High,Lo,
SINE or COS
Add 4.72 /33
Ch1 Channel 1 polarity both,POS or
NEG
both 4.74 /33
Ch2 Channel 2 polarity both,POS or
NEG
both 4.75 /34
Ch3 Channel 3 polarity both,POS or
NEG
both 4.76 /34
Ch4 Channel 4 polarity both,POS or
NEG
both 4.77 /34
Ch5 Channel 5 polarity both,POS or
NEG
both 4.78 /34
Ch6 Channel 6 polarity both,POS or
NEG
both 4.79 /34
Ch7 Channel 7 polarity both,POS or
NEG
both 4.80 /35
Ch8 Channel 8 polarity both,POS or
NEG
both 4.81 /35
(∗Optional)—this function will only be accessible if the relevant option is fitted
LDRSMANADD-2.3-0 13 of 44

CodE Data type for display dISP,ASCI,
UAL,ARtH,
M.buS,PtA,
SCAN,NMEA
or CS
dISP 4.82 /35
A1
OPER
Alarm relay 1 operation mode INPt,t.out
or both
INPt 4.83 /35
A2
OPER
Alarm relay 2 operation mode INPt,t.out
or both
INPt 4.84 /36
dS.to Display timeout 0to 9999 10 4.87 /36
t.out Data string timeout 0.0 to 10.0 1.0 4.88 /37
P.but Pbutton function NONE, Hi, Lo,
HILo, tARE
or ZERO
NONE 4.89 /37
R.INP Remote input (external input) one
function
NONE, P.HLd,
d.HLd, Hi, Lo
, HiLo, tARE,
ZERO, SP.Ac,
No.Ac or
duLL
NONE 4.90 /37
ACCS Access mode OFF, EASY,
NONE or ALL
OFF 4.85 /36
SPAC Setpoint access mode (∗Optional)A1, A1-2 etc. A1 4.86 /36
A1 Alarm relay 1 operation channel ch0 to ch8 ch0 4.91 /38
A2 Alarm relay 2 operation channel ch0 to ch8 ch0 4.92 /38
CLr
ZERO
Clear zero n/a n/a 4.93 /38
bAUd
RAtE
Baud rate for serial
communications
300, 600,
1200, 2400,
4800, 9600,
19.2 or 38.4
9600 4.94 /39
PrtY Parity for serial input NONE, EUEN
or Odd
NONE 4.95 /39
dAtA Data type 8.bit or
7.bit
8.bit 4.96 /39
SER.1
tYPE
Serial communications type
(∗Optional)
NONE, R232
or R485
NONE 4.97 /39
SER.2
tYPE
Not applicable to this model NONE, R232
or R485
NONE 4.98 /39
(∗Optional)—this function will only be accessible if the relevant option is fitted
14 of 44 LDRSMANADD-2.3-0

4 Arithmetic and Wind Speed/Direction mode functions
The LD display setup and calibration functions are configured through a push button sequence. The
three push buttons located on the input pcb (also at the front on some display options) 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 cali-
bration 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 vpush button (in some cases both simultaneously) when the required function is reached.
F
F
F
F
F
Entering ModeCAL Entering ModeFUNC
1. Remove power from the instrument
and wait 5 seconds . 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.
Move to step 2 below.
2. When the "wake up"
messages have finished
and the display has settled
down to its normal reading
press, then release the
button.
Move to step 3 below.
1. When the "wake up"
messages have finished
and the display has settled
down to its normal reading
press, then release the
button.
Move to step 2 below.
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
F
F
CAL
CAL
Notes: 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.
The instrument should show all 8’s on power up
e.g. if the instrument does not reset then
these numbers will not be seen. Switch off the instrument
and allow a longer time delay before powering up again.
CAL
8.8.8.8.
No special power up procedure
is required to enter mode.FUNC
Alternative Mode EntryCAL
This alternative method allows mode
entry without the need to remove power:
Enter mode using the 2 steps above
When the first function appears press and
hold the button until you see the message
followed by (the button will have
to be held pressed for approximately 2 seconds)
You should now return to the function you were
in but have full access to mode functions
Note: when you exit back to live reading the display
will remain in mode for approximately 4
minutes, after this time you will need to repeat
this process to enter mode.
CAL
FUNC
FUNC CAL
CAL
CAL
CAL
1.
2.
3.
P
P
F
F
F
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 or rear 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
LDRSMANADD-2.3-0 15 of 44

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.
4.1 Alarm relay 1 low setpoint
Display: A1Lo
Range: Any display value or OFF
Default Value: OFF
Displays and sets the low setpoint value for alarm 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 A1Lo 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 v
push 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
A1HY function.
Example:
If A1Lo is set to 10 then relay 1 will activate when the display value is 10 or less.
16 of 44 LDRSMANADD-2.3-0

4.2 Alarm relay 1 high setpoint
Display: A1Hi
Range: Any display value or OFF
Default Value: OFF
Displays and sets the high setpoint value for alarm 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 A1Hi 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 v
push 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
A1HY function.
Example:
If A1Hi is set to 100 then relay 1 will activate when the display value is 100 or higher.
4.3 Alarm relay 2 low setpoint
Display: A2Lo
Range: Any display value or OFF
Default Value: OFF
Displays and sets the low setpoint value for alarm relay 2 which operates in the same manner as the A1Lo
function. See A1Lo function for further description.
4.4 Alarm relay 2 high setpoint
Display: A2Hi
Range: Any display value or OFF
Default Value: OFF
Displays and sets the high setpoint value for alarm relay 2 which operates in the same manner as the
A1Hi function. See A1Hi function for further description.
LDRSMANADD-2.3-0 17 of 44

4.5 Alarm relay 1 hysteresis (deadband)
Display: A1HY
Range: 0to 9999
Default Value: 10
Displays and sets the alarm relay hysteresis limit for relay 1. To set a relay hysteresis value go to the
A1HY 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 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.
4.6 Alarm relay 2 hysteresis (deadband)
Display: A2HY
Range: 0to 9999
Default Value: 10
Displays and sets the alarm relay hysteresis limit for relay 2 which operates in the same manner as the
A1HY function. See A1HY function for further description.
4.7 Alarm relay 1 trip time
Display: A1tt
Range: 0to 999.9
Default Value: 0.0
Displays and sets the alarm trip time in seconds and tenths of 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 0.0 to 999.9 seconds. To set a trip time value go to the A1tt function and use the ^or vpush
buttons to set the value required then press Fto accept this value.
Example:
If A1tt is set to 5.0 seconds then the display must indicate an alarm value for a full 5 seconds before
relay 1 will activate.
18 of 44 LDRSMANADD-2.3-0

4.8 Alarm relay 2 trip time
Display: A2tt
Range: 0to 999.9
Default Value: 0.0
Displays and sets the alarm trip time in seconds and tenths of seconds for relay 2 and operates in the
same manner as the A1tt function. See A1tt for further description.
4.9 Alarm relay 1 reset time
Display: A1rt
Range: 0.0 to 999.9
Default Value: 0.0
Displays and sets the alarm reset delay time in seconds and tenths of 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 0.0 to 999.9 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 10.0 seconds then the resetting of alarm relay 1 will be delayed by 10 seconds.
4.10 Alarm relay 2 reset time
Display: A2rt
Range: 0.0 to 999.9
Default Value: 0.0
Displays and sets the alarm reset time in seconds and tenths of seconds for relay 2 and operates in the
same manner as A1rt function. See A1rt for further description.
4.11 Alarm relay 1 normally open/closed
Display: A1n.o or A1n.c
Range: A1n.o or A1n.c
Default Value: A1n.o
Displays and sets the setpoint alarm relay 1 action 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 alarm
for normally open or closed go to the A1n.o or A1n.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.
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4.12 Alarm relay 2 normally open/closed
Display: A2n.o or A2n.c
Range: A2n.o or A2n.c
Default Value: A2n.o
Displays and sets the setpoint alarm relay 2 action to normally open (de-energised) or normally closed
(energised) and operates in the same manner as the A1n.o or A1n.c function. See A1n.o or A1n.c for
further description.
4.13 Alarm relay setpoint or trailing operation
Display: A2SP or A2t1
Range: A2SP or A2t1
Default Value: A2SP
Relay operation independent setpoint or trailing setpoint, this function will not be seen unless extra
optional relays are fitted. Each alarm, except relay 1, 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 2 (A2) may be independent or may be linked to Alarm 1.
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 2 set to trail alarm 1, if A1Hi is set to 1000 and A2Hi is set to 50 then Alarm 1 will
activate at 1000 and alarm 2 will activate at 1050 (i.e. 1000 + 50). If Alarm 2 had been set at -50
then alarm 2 would activate at 950 (i.e. 1000 – 50).
4.14 Display brightness
Display: brGt
Range: 1to 63
Default Value: 63
Seen only when brGt AUto is set to OFF. Displays and sets the digital display brightness. The display
brightness is selectable from 1to 63, where 1= lowest intensity and 63 = 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 4.15. 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.
4.15 Display remote brightness switching
Display: duLL
Range: 0to 63
Default Value: 15
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 4.14 and the display brightness set by the duLL function. The display dull level is
selectable from 0to 63, where 0= lowest intensity and 63 = 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.
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