Incon 1250-LTC Installation And Programming Manual

INSTALLATION AND

PROGRAMMING MANUAL

FOR MODEL

1250-LTC

PROGRAMMABLE POSITION MONITOR

Solid State Indicator for SynchroTransmitter

000-2072 Rev. C

1

INTELLIGENT CONTROLS, INC.

PO Box 638

Saco, Maine 04072 USA

Phone: [phone] FAX: [phone]

Toll Free: Technical Service & Sales 800-872-3455

Web Site: www.incon.com E-mail: [e-mail]

This manual applies to all INCON model 1250-LTC monitors

Copyright 2008, Intelligent Controls, Inc. All rights reserved

.

2

TABLE OF CONTENTS

Section: Page:

List of Figures…………………………………………………………………… 4

List of Tables……………..……………………………………………………… 4

Introduction……………………………………………………………………... 5

1.0 Installation……………………………………………………………..…… 5 - 8

2.0 Programming…………………………………………………………..…… 9 – 33

2.1 Front Panel Programming…………………………………………….. 9

2.2 Serial Port Programming – ASCII …………………………………… 13 - 17

2.3 Serial Port Programming – MODBUS……………………………….. 18 – 33

2.3.1 MODBUS Packet Format – Read……………………………….. 19

2.3.2 MODBUS Packet Format – Write………………………………. 20

2.3.3 MODBUS Packet Format – Error Exception Response……….. 21

2.4 Operating Modes………………………………………………………. 34 – 37

2.5 Programming Notes……………………………………………………. 38

3.0 Options…………………………………………………………………..….. 39 – 48

3.1 Analog Output……………………………………………………..…… 39

3.2 High / Low Relay Limits………………………………………..……… 40 – 45

3.2.1 Tap Change Acknowledgement.………………………………… 41

3.2.2 High Tap / Low Tap……………………………………………… 41

3.2.3 Total Tap Change Count………………………………………… 42

3.2.4 On-Tap Alarm……………………………………………………. 42

3.2.5 Up-To & Down-To Count………………………………….…….. 44

3.2.6 Pass-Through-Neutral Alarm…………………………….……… 44

3.2.7 One-Direction Change Count…………………………….……… 45

3.2.8 FA 25 & FA 27 Error Alarm…………………….…………….… 45

3.3 Serial RS-232…………………………………………………...……….. 46

3.4 Serial RS-485 .……………………………………...………………….... 47

3.5 Input Isolation…………………………………………………...……… 48

4.0 Field Calibration and Test………………………………………...…….…. 48 – 49

5.0 Error Codes…………………………………………………………….……. 50

6.0 Specifications…………………………………………………………….….. 51

3

LIST OF FIGURES

Figure: Page:

1.1 Mechanical Dimensions…………………………………………………………… 6

1.2 Field Wiring Diagram…………………………………………………………….. 6

1.3 Field Wiring Diagram with 4-20mA Option.…………………………………….. 7

2.1 Simplified Programming Flowchart…...…………………………………………. 12

2.2 Serial Data Dump Example……………………………………………………….. 17

2.3 Base 1 Uni-Polar Mode Analog Output………………………………………….. 35

2.4 Base 0 Uni-Polar Mode Analog Output………………………………………….. 36

2.5 Bi-Polar Mode Analog Output…………………………………………………… 37

3.1 Relay Field Wiring Diagram……………………………………………………... 40

3.2 On-Tap Example………………………………………………………………….. 43

4.1 Analog Output Adjustment Pots…………………………………………………. 49

LIST OF TABLES

Table: Page:

1.1 Terminal Functions……………………………………………………………… 7

1.2 DIP Switch Functions…………………………………………………………... 7

1.3 Analog Output Configuration Jumpers…………………………………………. 8

2.1 Numeric and Alpha-numeric Menu Items……………………………………… 9-12

2.2 Serial Programming ASCII Commands……………………………………….. 13-15

2.3 Read Registers Command Format..……………………………………………. 19

2.4 Read Registers Response Format.…………………………..………………….. 19

2.5 Write Registers Command Format……………………………………………... 20

2.6 Write Registers Response Format……………………………………………… 20

2.7 Error Exception Response Format……………………………………….…….. 21

2.8 RS-485 MODBUS Register Definitions...……………………………………… 22-33

3.1 Analog Output Load Limits……………………………………………………. 39

3.8 Wiring: Digital Connector Pin-Out……………………………………….…….. 47

5.1 Error Codes …………………………………………………………….….……. 50

4

INTRODUCTION

The Model 1250-LTC Programmable Position Monitor is a highly advanced solid­state instrument, which measures the absolute position of a synchro transmitter. It provides
both a user definable visual panel indication and optional analog and digital signal outputs
suitable for a variety of monitoring and control applications.

The INCON 1250-LTC series is unique in its capability to monitor up to 40 user­definable position segments. It is specifically designed for monitoring power transformer
load tap changer position, where the desired readout is in whole tap numbers. Its transmitter
can be attached to any operating shaft on the LTC and the 1250 programmed to read out in tap
positions. The display and all outputs follow a “stair step” function defined in the program.
The INCON 1250 has become the industry standard for LTC position monitoring.

In addition to basic LTC tap position, the 1250-LTC can provide useful information
about the movement of the LTC. Beginning with a momentary (optional) relay closure after
each successful tap change, the 1250-LTC keeps records on seven important issues relating to
LTC movement, including: total number of tap changes; number of days since last “pass
through neutral”; number of changes “up to” and “down to” each tap; and more.

Most LTC’s rotate about 9 to 11 degrees with each tap change. The 1250-LTC can
measure in increments of 1/10th of a degree. A special feature of the 1250-LTC is its ability
to monitor small discrepancies in tap position. A programmable limit can be set to give an
alarm when the discrepancy in tap position reaches the limit. Inaccurate tap position can be
an early indicator of wear in the LTC mechanism or possible impending failure.

The 1250-LTC may be wired in parallel with existing synchro transmitter/receiver
pairs or wired directly to the synchro transmitter. Additional 1250’s may be wired to the
same transmitter without compromising the accuracy or reliability of the system.

1.0 INSTALLATION

• The Model 1250-LTC is designed for use in any 50/60 Hz, five-wire synchro system
compatible with electrical specifications given in Section 6.0, page 51. These devices
include CX, TX, CDX, and TDX function synchros, as well as Self-Synchronous
Indicator devices. (INCON’s model 1292 Synchro is a highly specified robust
transmitter with a history of proven performance.)

• The panel-mount case is designed to snap-fit into a standard 1/8 DIN rectangular
cut-out of 44mm (1.73 in.) by 92mm (3.62 in.)

• Wiring is done to the rear of the case. #16 AWG (min.) type THHN, THWN, TFFN,
or equivalent wire is recommended for the five AC synchro lines. #20 AWG (min.)
shielded twisted pair wire is recommended for analog output wiring. Use appropriate
spade lugs (provided) when connecting to the case terminals.

• Contact INCON Technical Service (1-800-872-3455) for application assistance if the
synchro transmitter and the 1250-LTC monitor are separated by a wire run of more
than 1200 feet.

5

Figure 1.1 Mechanical Dimensions

Figure 1.2 Field Wiring Diagram

6

Figure 1.3 Field Wiring Diagram with 4-20mA Output

Table 1.1 Terminal Functions

Terminal Function Terminal Function

A S1 1 Analog Output +
B S2 2 Analog Output –
C S3 3 Program Mode Inhibit
D (Spare) 4 Inhibit Return
E R1 * 5 Line L1 *
F R2 * 6 Line L2 *
7 Chassis Ground
* Terminals E & F are 8 Relay Low Contact N.O.
jumpered to 5 & 6 9 Relay Common
respectively 10 Relay High Contact N.O.

A DIP switch tells the firmware which hardware options are installed, so their function
can be enabled. It is located on the top PCB, above the power transformer and is
accessible through a slot in the left side of the case, towards the rear of the instrument.

Table 1.2 DIP Switch Functions

Switch # Function

1 Serial Communications Option Enable
2 MODBUS Protocol Enable
3 Spare
4 High / Low Relay Limit Option Enable
5 Analog Output Option Enable
6 Spare
7 Spare
8 In-Factory Test & Calibration Menu Enable

7

Installation Notes:

1) A resistor may be wired remotely across the analog output terminals to convert analog
output milliamp current to a voltage. Use Ohm’s Law to calculate the proper resistance
for the desired voltage based upon the 1250-LTC’s rated output current.

2) Maximum analog output load resistance: 0-1mA = 10K ohms; +/-1mA = 10K ohms;
0-2mA = 5K ohms; 4-20mA = 500 ohms.

3) Models with 4-20 mA analog output options must have an EXTERNAL LOOP POWER
SOURCE of 10.0 VDC minimum, 24.0 VDC maximum, in series with the current loop.
The INCON Model 1945 Power Supply is recommended for these installations,
(See Figure 1.3, page 7).

4) When additional remote indication is needed, several 1250-LTC’s may be wired in
parallel to the same transmitter. The 1250-LTC can also be connected via its serial port to
the INCON model RD-4 Remote Display unit.

5) The 1250-LTC and the synchro transmitter MUST BE WIRED TO THE SAME AC
SOURCE. Do not remove the jumpers from terminals E and F.

6) A wire jumper or keyswitch may be installed between terminals 3 & 4 to prevent the
program from being changed. When these terminals are jumpered the menu will read
“EP-x” instead of “OP-x”, which indicates that you can Examine each Parameter, but not
change them.

7) After installation and programming, install the rear terminal guard with screws provided.

8) For models with serial options, plug the cable onto the card edge with the red stripe
towards the outside of the case.

Application Bulletins:

1) If there is a large component of AC “ripple” present on the 1250 analog output, check the
isolation of all wiring with respect to earth ground. R1, R2, S1, S2, and S3 should
measure infinite resistance to earth ground. In applications where external isolation is not
sufficient, the Input Isolation Option (-I) is required to break the ground path that causes
this ripple. See Application Bulletin #000-1150 for more detailed information.

2) Analog outputs of 0-1mA, +/-1mA, and 0-2mA can be changed in the field to any one of
the other two (see Table 1.3). The configuration jumpers are located on the bottom PCB.
See Application Bulletin #000-1151 for more detailed information.

Table 1.3 Analog Output Configuration Jumpers

Output Signal: J8 J10 J12 J13

0-1mA Jumped Jumped Jumped

+/-1mA Jumped Jumped Jumped

0-2mA Jumped Jumped

8

2.0 PROGRAMMING

The Model 1250-LTC has three methods of programming: numeric menu (traditional

1250); alphanumeric menu; and serial port programming commands. The 1250-LTC can be

ordered with either RS-232 or RS-485 serial port hardware. The serial programming
commands can be in the form of ASCII characters or MODBUS packets, depending upon the
position of DIP switch #2. See Tables 2.1, 2.2 & 2.3 for a full listing of all programming
menu items, commands, and syntax. See the simplified programming flowchart for tap
position on page 12, Figure 2.1.

2.1 Front Panel Programming

To access the numeric or alphanumeric programming menu, press the MENU key for
several seconds until the display goes blank, then press the SELECT/ENTER key. The
display should read “OP 0”. The default menu is the numeric menu. To choose the
alphanumeric menu, press the DOWN key to select OP 99. Press the SELECT/ENTER key,
the display should read “to OP”. Press the UP key. The display should read “run”. You are
now in the alphanumeric menu mode.

To change a parameter using the numeric or alphanumeric menus, select the parameter
to be changed from the menu, press the SELECT/ENTER key. The parameter’s present
setting will now be displayed. You can change the setting by pressing the UP or DOWN key.
To store the new setting, press the SELECT/ENTER key, the display will return to the menu.

Table 2.1 Numeric and Alphanumeric Menu Items:

Num­eric

OP 0 run Press the SELECT/ENTER key to exit the

OP 2 Func Select Operating Mode (see pages 34-37) 21 16, 17, 18, 19, 20,

OP 3 tCrLY Selects which relay will assert

OP 4 tCrdL Sets the delay time before Tap Change

OP 5 tCrLt Sets duration of time the Tap Change

OP 6 dHF-L Selects which visit to the Draghand

OP 10 LtCLr Low Tap Alarm Clear CL
OP 11 HtCLr High Tap Alarm Clear CL
OP 15 rL Lt Sets low relay limit tap -16 Any valid tap

OP 16

OP 17 rL Ht Sets high relay limit tap +16 Any valid tap

OP 18

Alpha-numeric
Protocol

LtrLY

HtrLY

Function: Default

Value:

Program mode

OFF OFF, LO, HI

momentarily, after each tap change

0.0 0.0 to 9.9

Acknowledge Relay turns on (Seconds)

0.0 0.0 to 9.9

Acknowledge Relay stays on (Seconds)

LASt “FirSt”, “LASt”
positions (first
the day counters

Selects which relay will assert when the
“Low Tap” alarm limit is reached

Selects which relay will assert when the
“High Tap” alarm limit is reached

time or last time) will begin

OFF OFF, LO, HI

OFF OFF, LO, HI

Programmable
Range:

21

number

number

9

Num­eric

OP 19

OP 20
OP 21
OP 22 nEu Number of neutral taps 1 0 to 8
OP 23 n St Sets lowest neutral tap 0-1 Any valid tap

OP 27 S Pt Sets present tap position 0 Any valid tap

OP 28 L Pt Loads present tap position into memory Ld
OP 29 dSPrL Enables display of “r” or “L” in Function

OP 30 CAL E Enables analog output Calibration Mode OFF On or OFF
OP 31 L CAL Forces the analog output to its lowest

OP 32 H CAL Forces the analog output to its high scale

OP 33 d CAL Forces the analog output to its mid scale

OP 34 t CAL Forces the analog output to alternate

OP 39 dOG t Forces a Watchdog Reset (Factory use

OP 40 LED t Display LED Test: Turns on all LED’s -8.8.8.8.8.
OP 41 rS t RS-232 Echo Test: Re-transmits characters

OP 42 InCAL Calibrates synchro input circuitry CAL
OP 43 rLY t Relay Test: UP and DOWN keys toggle

OP 50 dSPbL Causes the display to go blank after 60 sec. OFF On or OFF
OP 51 SEr Serial Communication Mode:

OP 53 Aut25 Auto-Reset after “FA 25” Loss of Synchro

OP 54

OP 55 ttCLt Sets Total Tap Change counter alarm limit

OP 56 ttrLY Selects which relay will assert when the

OP 57 ttPrE Presets the Total Tap Change counter in

OP 58 ttdtE Total Tap Change counter reference date

OP 59 ttCdS Displays Total Tap Change Count and

Alpha-numeric
Protocol

dEGrE

tAPS
d SEG

25rLY

Function: Default

Value:

Displays absolute synchro position in
degrees with one decimal place resolution
Number of taps 33 2 to 40
Degrees per tap 10.000 -99999 to +99999

Modes 20 and 21

signal output

signal output

signal outputs

between high and low scale signal outputs

only)

received through the RS-232 serial port

between LO and HI relays

0=Serial Disabled,
1=Data Logger Mode, 2=Polled Mode,
3=Sampled Mode, 4=Serial Command
Mode, 5=Reserved, 6= MODBUS Mode,
7=Remote Display Driver Mode

Signal Error (page 50)
Selects which relay will assert when the
“FA 25” error is active

in THOUSANDS

Total Tap Change counter limit is reached

THOUSANDS

Enter day, month, year

reference date Press ENTER to exit

OFF On or OFF

LO

HI

- -

LO then HI

<<Press ENTER>>

rS

LO then HI

0 0 to 4, and 6

OFF On or OFF

OFF OFF, LO, HI

000.01 000.01 to 999.99

OFF OFF, LO, HI

000.00 000.00 to 999.99

01–01–00

Programmable
Range:

number

number

10

Num­eric

OP 60 Aut27 Auto-Reset after “FA 27” Unstable

OP 61

OP 62 OtGLt Sets On-Tap guard band limit (Degrees) 0.1 0.1 to 9999.9
OP 63 OtrLY Selects which relay will assert when the

OP 64 OtdtE On-Tap reference date

OP 65 OtdIS Scrolls through the list of taps, to select,

OP 66 Otdtd Scrolls through the list of taps which have

OP 67 OtCLr Clears the On-Tap alarm CL
OP 68 OtrSt Resets all On-Tap logs & alarm rESEt
OP 70 udCLt Sets the alarm limit for the number of

OP 71 udrLY Selects which relay will assert when the

OP 72 uddtE UP TO & DOWN TO Change counter

OP 73 uddIS Scrolls through the list of taps to select,

OP 74 udCLr Clears an active Up-To and Down-To

OP 75 udrSt Resets all Change Up-To and Down-To

OP 80 POrt Sets serial port parameters: (press the UP

OP 85 PtnLt Sets the limit for number of days without a

OP 86 PtrLY Selects which relay will assert when the

OP 87 PtdIS Displays the number of days since the last

Alpha-numeric
Protocol

27rLY

Function: Default

Value:

OFF On or OFF
Synchro Signal Error (page 50)
Selects which relay will assert when the
“FA 27” error is active

On-Tap guard band limit is reached

Enter day, month, year

Press ENTER to display the highest
measured deviation, for that tap
Press MENU to escape back to the menu

exceeded the On-Tap alarm limit to select,
Press ENTER to display the highest
measured deviation, for that tap
Press MENU to escape back to the menu

changes UP TO any tap in THOUSANDS

“UP TO” change alarm limit is reached

reference date Enter day, month, year

Press ENTER to display the Change Up­To count Press ENTER to display the
Change Down-To count, for that tap
Press MENU to escape back to the menu

Change alarm

counters and alarm

or Down key to select a value, press the
enter key to move to the next parameter)

Baud rate

Word length

Parity (n=none, E=even, O=odd)

Stop bits

Address (for RS-485 Multi-drop)

“Pass Thru Neutral”

“Pass Thru Neutral” time limit is reached

“Pass-Through-Neutral”

OFF OFF, LO, HI

OFF OFF, LO, HI

01–01–00

Any valid tap

Any valid tap

000.01 000.01 to 999.99

OFF OFF, LO, HI

01–01–00

0 Any valid tap

CL

rESEt

9600

8

n

1

128

OFF Off, 0.1 to 365.0

OFF OFF, LO, HI

Programmable
Range:

number

number

number

2400, 4800, 9600,
14400, 19200,
28800,38400,
57600, 76800

7 or 8
n, E, O
1 or 2
0 to 255

11

Num­eric

OP 88 PtrSt Resets the “Pass-Through-Neutral”

OP 90 1dCLt Sets the limit for number of consecutive

OP 91 1drLY Selects which relay will assert when the

OP 92 1ddIS Displays the number of days since the

OP 93 1dCLr Clears “One Direction Change” alarm CL
OP 99 tO OP Toggles between Numeric and

Alpha-numeric
Protocol

Function: Default

Value:

rESEt
counter & alarm

2 2 to 30
tap changes in One Direction

OFF OFF, LO, HI
“One Direction Change” limit is reached

“One Direction Alarm” was asserted

tO OP
Alphanumeric menus

Programmable
Range:

Figure 2.1 Simplified Programming Flowchart

12

2.2 Serial Port Programming - ASCII:

These commands require either the RS-232 (-S) or RS-485 (-M) hardware option. To use
the serial port programming commands, connect a computer terminal to the serial port cable. The
terminal must have the proper Comm port settings to communicate to the 1250-LTC (see Sections

3.3 and 3.4, pages 46 - 47). See Table 2.2 for a full listing of all Serial Programming Commands
and syntax. At the command prompt, type a command followed by the new parameter setting,
using proper syntax as shown in Table 2.2. Typing the command only, without a new para-

meter setting, will cause the 1250-LTC to transmit the present setting for that parameter.

Table 2.2 Serial Programming ASCII Commands:

◊=space ª=enter

Command Syntax: Function: Explanation:

SETUPª Enter the Setup Mode This command must be entered before

any other commands can be made.

EXITª Re-starts the serial connection Changes to comm. port settings will take

effect

RUNª Return to the Run Mode Changes to settings will take effect
DISPª Displays all setup parameters Each setup parameter command is dis-

played with the current value following it

DUMPª Displays all measured LTC

information

(See Figure 2.2, page 17)

POSª Displays present Tap #, synchro

position (in degrees) and current
On-Tap deviation degrees

MODE◊nnª
ACKRLY◊LOª

ACKDLY◊nn.nª

ACKHOLD◊nn.nª

DHCOUNT◊FIRSTª

DHLRST Low Draghand Reset Draghand value becomes present tap
DHHRST High Draghand Reset Draghand value becomes present tap
LTLMT◊nnª
LTRLY◊LOª

LTCLRª Clears Low Tap Alarm Also resets “Days Since Alarm” counter
HTLMT◊nnª
HTRLY◊LOª

HTCLRª Clears High Tap Alarm Also resets “Days Since Alarm” counter
TAPS◊nnª

Segmented modes See Section 2.4, page 34-37 for details
Selects which relay will assert

momentarily after each tap
change
Sets the delay time, in seconds,
before the ACK relay asserts
Sets the duration, in seconds,
that the ACK relay remains on
Selects which visit to the
Draghand position to begins the
day counter

Set Low Tap alarm limit n= an integer, any valid tap number
Selects which relay is associated

with the Low Tap alarm

Set High Tap alarm limit n= an integer, any valid tap number
Selects which relay is associated

with the High Tap alarm

Set number of taps n= an integer from 2 to 40

Lists: Total tap change count, Days since
Pass-Through-Neutral, High & Low
Draghand positions, Change Up-To and
Down-To counts for each tap, Maximum
On-Tap deviations for each tap, etc…
Reads Tap #, 0.0 to 359.9 degrees, with
one decimal place of resolution
Press ª (enter) to exit

Choose “OFF”, “LO” or “HI” relay to
assert momentarily after each tap change

n= a number from 0.1 to 9.9 with one
decimal place resolution
n= a number from 0.1 to 9.9 with one
decimal place resolution
Choose “FIRST” or “LAST” visit.
The number of days since the LTC
visited that extreme position the first or
last time

Choose “OFF”, “LO” or “HI” relay to
assert when the alarm limit is reached

Choose “OFF”, “LO” or “HI” relay to
assert when the alarm limit is reached

13

Command Syntax: Function: Explanation:

DEGSEG◊n.nnnnª

NEUTRALS◊nª
NSTART◊nnª
SETTAP◊nnª
LDTAPª
DISPRL◊ONª

ANACALª

WDOGTESTª
LEDTESTª Turns on all display segments Press the enter key to stop the LED test
INCALª Self-calibrates the input circuitry Outputs “Pass” or “Fail” calibration

RLYTESTª Forces Hi / Lo relay output to

DSPBL◊ONª

SERIAL◊nª

AUTO25◊ONª

FA25RLY◊LOª

RESET25ª Manually clears the “FA 25”

TTCLMT◊nnn.nnª

TTCRLY◊LOª

TTCPRE◊nnn.nnª

TTCDATE◊mm-dd-yyyyª

AUTO27◊ONª

FA27RLY◊LOª

RESET27ª Manually clears the “FA 27”

Set degrees per segment n= a floating point number, 5 digits max,

average number of degrees between taps
Set number of neutral taps n= an integer from 0 to 8
Set lowest neutral tap number n= an integer, any valid tap number
Set present tap position n= an integer, any valid tap number

Load present tap pos. into memory
Enables the display of “r” (raised)

and “L” (lowered) tap numbers

Must be done for SETTAP to take effect

“ON” or “OFF” When enabled causes

the display to show “r” and “L” in

function modes 20 and 21 only

Enter analog calibration mode, the
1250 analog output will be forced
to Low / Mid / High signal output
Forces a Watchdog Reset This command is for factory use only.

Press the space bar to toggle between

Low / Mid / High analog output. Press the

enter key to stop calibration

result

Press the Space Bar to toggle between
close
Enables the display blanking
feature

Lo or Hi relay Press ª (enter) to exit

“ON” or “OFF” When enabled causes

the display to go blank after 60 sec.
Set serial communication mode 0=Serial Disabled, 1=Data Logger

Mode, 2=Polled Mode,

3=Sampled Mode,

4=Serial Command Mode, 5= Reserved,

6=MODBUS Mode, 7=Remote Display

Driver

Enables automatic reset of the
“FA 25” Loss of Synchro Signal
Error (page 50)
Selects which relay is associated
with the “FA 25” Error

“ON” or “OFF” When “ON”, the

“FA 25” alarm will automatically reset

when the condition clears

Choose “OFF”, “LO” or “HI” relay to

assert when the FA 25 Error is active

When AUTO25 is “OFF”, manually
alarm
Sets the Total Tap Change count
alarm limit in THOUSANDS
Selects which relay is associated
with the Total Tap Change count

clears the alarm and opens the relay

n= a number from 0.00 to 999.99 with

two decimal place resolution

Choose “OFF”, “LO” or “HI” relay to

assert when the alarm limit is reached
alarm

Presets the Total Tap Change
counter

and clears the alarm

Sets the Total Tap Change

counter reference date

in THOUSANDS

Enables automatic reset of the
“FA 27” Unstable Synchro
Signal Error (page 50)
Selects which relay is associated
with the “FA 27” Error

n= a number from 0.00 to 999.99 with

two decimal place resolution

mm-dd-yyyy = Month <hyphen> Day

<hyphen>Year (4 digits)

“ON” or “OFF” When “ON”, the

“FA 27” alarm will automatically reset

when the condition clears

Choose “OFF”, “LO” or “HI” relay to

assert when the FA 27 Error is active

When AUTO27 is “OFF”, manually
alarm

clears the alarm and opens the relay

14

Command Syntax: Function: Explanation:

OTGDLMT◊nn.nª

Sets the On-Tap guard band
limit in DEGREES

OTRLY◊LOª

Selects which relay is associated
with the On-Tap alarm

OTDVTNª Displays the tap with the greatest

On-Tap Deviation

OTDATE◊mm-dd-yyyyª

Sets the On-Tap reference date

OTCLRª Clears the On-Tap alarm Data is retained, the alarm is cleared
OTRSTª Resets all On-Tap logs & alarm All On-Tap data is erased, alarm cleared
UPDNLMT◊nnn.nnª

Sets the alarm limit for the
number of changes “Up-To”
and “Down-To” any tap

in THOUSANDS

UPDNRLY◊LOª

Selects which relay is associated
with the “Up-To / Down-To”
Change alarm

UPDNDATE◊mm-dd-yyyyª

Sets the Up To / Down To

Change counter reference date

UPDNCLRª Clears an active Up-To or

Down-To Change alarm

UPDNRSTª Resets all Change Up-To and

Down-To counters and alarm

PORT◊bbbb◊w◊p

◊s◊aª

Set comm. port settings: baud
rate, word length, parity, stop
bits, and address

SITEID◊Abcd-Xyz & 123ª

Identifies installation site on the
“DUMP” header

PTNLMT◊nnnª

Sets the alarm limit for the
number of DAYS without a
“Pass Through Neutral”

PTNRLY◊LOª

Selects which relay is associated
with the “Pass-Through-Neutral”
alarm

PTNRSTª Resets the “Pass-Through-

Neutral” counter & alarm

1DTCLMT◊nnª

Sets the alarm limit for the
number of consecutive tap
changes in One Direction

1DTCRLY◊LOª

Selects which relay is associated
with the “One Direction” alarm

1DTCCLRª Clears a “One Direction” alarm
MENU◊1ª

Set the keyboard button menu
type

n= a number of degrees from 0.0 to 99.9

with one tenth degree resolution

Choose “OFF”, “LO” or “HI” relay to

assert when the alarm limit is reached

Displays Tap Number and Deviation

mm-dd-

yyyy = Month <hyphen> Day

<hyphen>Year (4 digits)

n= a number from 0.00 to 999.99 with

two decimal place resolution

Choose “OFF”, “LO” or “HI” relay to

assert when the alarm limit is reached

mm-dd-yyyy = Month <hyphen> Day

<hyphen>Year (4 digits)

If a tap with an Up-To or Down-To Change

counter exceeding the programmed limit is

re-visited, the alarm will re-activate

All Up-To and Down-To counters are reset

to zero and an active alarm is turned off

b=

2400, 4800, 9600, 14400, 19200,

28800, 38400, 57600, 76800 baud

w= 7 or 8 bit word

p= n, E, O

s= 1 or 2 stop bits

a= 0 to 255

40 ASCII Characters – Upper / lower case

letters, numbers, punctuation marks

n= a number from 0.0 to 365.0 with one

decimal place resolution

Choose “OFF”, “LO” or “HI” relay to

assert when the alarm limit is reached

n= an integer from 2 to 30, OFF

Choose “OFF”, “LO” or “HI” relay to

assert when the alarm limit is reached

“1” = Numeric “OP” menu or

“2” = Alpha-numeric menu

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HELP◊(command) ª

Provides on-line help on the
specific command entered or
lists all available commands

An explanation of a command and the

proper entry syntax is given. If no

command is entered, all commands will

be listed with syntax but no explanations

To prevent accidental or unwanted changes to the program parameters, a jumper wire
may be installed across terminals 3 & 4. With this jumper installed, the numeric menu will
read “EP nn” instead of “OP nn”. All parameters can be viewed but no changes can be made.

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