Ametek Gemco 1995A Series Assembly instructions

Micro-Set Programmable Limit Switch
Gemco®
Series 1995A
Installation & Programming Manual
www.comoso.com

iInstallation & Maintenance Manual
1080 North Crooks Road
Clawson, MI 48017-1097
Phone: [phone]
FAX: [phone]
Internet: www.ametekapt.com www.ametek.com
Copyright 2000 by AMETEK
All Rights Reserved - Made in the U.S.A.
Version 0.
AMETEK has checked the accuracy of this manual at the time it was printed. Any comments you may
have for the improvement of this manual are welcomed.
AMETEK reserves the right to revise and redistribute the entire contents or selected pages of this
manual. All rights to the contents of this manual are reserved by AMETEK.
Preface
This manual is for the Installation and Maintenance of the Gemco eries 1995A Micro- et Programmable
Limit witch.
www.comoso.com

Installation & Maintenance Manualii
Contents
Chapter 1: Introduction/Description 1
1.1 Programmable Features ....................................................................................................... 1
1.2 General Information ............................................................................................................. 1
1. Controller Features and Functions ........................................................................................ 2
Chapter 2: Installation 3
2.1 Mechanical Installation .........................................................................................................
2.2 Electrical Installation ............................................................................................................ 4
2. Wiring Instructions ............................................................................................................... 4
Chapter 3: Programming 5
.1 Security Input ...................................................................................................................... 5
.2 Initialization .......................................................................................................................... 5
. Scale Factor ........................................................................................................................ 5
.4 Number of Outputs .............................................................................................................. 6
.5 Selecting Number of Outputs ............................................................................................... 6
.6 Multiprogram (Available Only on P Option Units) .............................................................. 6
.7 Setpoint Formula ................................................................................................................. 7
.8 Setpoints ............................................................................................................................. 8
.9 Clear an Existing Setpoint .................................................................................................. 10
.10 Clear All Setpoints ............................................................................................................ 10
.11 Setpoint Availability ........................................................................................................... 10
:12 Electronic Offset ............................................................................................................... 11
.1 Reset-to-Preset ................................................................................................................ 11
.14 Motion Detector ............................................................................................................... 12
.15 Power-Up in a Position or RPM ....................................................................................... 1
.16 Decimal Point Programming .............................................................................................. 1
.17 Enable/Disable Outputs ..................................................................................................... 14
.18 Linear Speed Offset (Available Only on Option P Units .................................................. 14
.19 Programming 1995 PLS for Linear Speed ......................................................................... 16
.20 Minimum Speed Disable ................................................................................................... 16
.21 Time-Based Outputs (Available Only on Option P Units) ................................................ 17
Chapter 4: Expansion Modules 1
Chapter 5: Fault Check 19
5.1 PLS Output Status on Fault Conditions ............................................................................... 20
www.comoso.com

iiiInstallation & Maintenance Manual
Chapter 6: Security Inputs 21
Chapter 7: Remote Circular Display 22
7.1 POS/RPM On Remote Circular Display ............................................................................. 22
Chapter : Troubleshooting 23
8.1 Preliminary Checks ............................................................................................................ 2
8.2 Transducer Excitation Voltages ........................................................................................... 2
8. Electrical Noise and Power Quality Consideration .............................................................. 24
8.4 Grounding ......................................................................................................................... 24
8.5 Incoming Power ................................................................................................................ 24
8.6 Low Level Inputs ............................................................................................................... 24
Chapter 9: Specifications 26
9.1 1995 Micro-Set PLS Programmer ..................................................................................... 26
9.2 Mechanical Relay (Single Pole, Double Throw) .................................................................. 26
9. AC Solid-State (Single Pole, Normally Open) .................................................................... 26
9.4 DC Solid-State (Single Pole, Normally Open) .................................................................... 27
9.5 1995E Output Expansion Module ...................................................................................... 27
9.6 1995-1446 Remote Circular Display .................................................................................. 27
Chapter 10: Troubleshooting Guide 2
Chapter 11: Wiring Diagrams 31
www.comoso.com

1
Installation and Maintenance Manual
Chapter 1: Introduction/Description
Scale Factor Two scale factors to choose from either 360 or 1,000. On units
with P option software, the scale factor is permanently set to
360.
Electronic Offset Fully programma le offset to any num er with the scale factor.
Reset-to-Preset Reset value is programma le to any num er within the scale factor.
Motion Detector LS6 can e programmed for either limit switch or motion detect
output.
Expansion Outputs Programma le to accommodate up to 30 circuits.
See Section 1.2: General Information - Soft are Option P for more options.
Chapter 1: Introduction/Description
The 1995A Micro-Set is a fully self-contained, single-turn resolver- ased programma le limit switch.
It includes a three-digit LED display, six output relays, and one fault check relay, and it is fully program-
ma le for the following features:
1.1: Programmable Features
1.2: General Information
The 1995A Micro-Set is a fully self-contained, microcomputer- ased Programma le Limit Switch
(PLS) with a convenient keypad for programming each independent output circuit to open or close at
the desired settings. This system allows precise position control of rotary motion.
A 1995A consists of a resolver- ased transducer, resolver-to-programmer ca le assem ly, and the
programmer, which provides six limit switch outputs and one fault check output. The optional output
expansion modules will add six additional limit switch outputs per module, and up to four expansion
modules can e driven y the programmer, for a total of thirty limit switch outputs.
The single-turn resolver transducer generates a ratiometric analog signal representing an a solute rotary
position. This ratiometric signal is converted to a digital signal at the Micro-Set. A microprocessor
calculates and/or converts these signals ased on user-programmed data.
As the transducer passes through the preprogrammed dwell settings, the programmer outputs can
energize solenoids, relays, or solid-state circuitry to control external circuits.
The 1995A PLS was designed for use in rotary and/or rotary-to-linear applications. It incorporates
many features for safe, efficient operation.
www.comoso.com

Chapter 1: Introduction/Description
Installation and Maintenance Manual
2
The completely self-contained unit can operate up to 30 independent outputs (six standard) ased on
the rotary position of the resolver.
It offers an on line fault check which provides an automatic, in-process mechanism to verify that all
major programma le limit switch functions are operating properly. The fault check output can e
energized y activating the fault check ena le input. The output is a mechanical relay with 1 N.O. and 1
N.C. contact, which remains energized during normal operation.
A programma le motion detect output will energize a relay when the transducer speed meets or
exceeds the customer-preprogrammed RPM value.
SOFTWARE OPTION P ENHANCES THE SYSTEM BY OFFERING:
nMultiple Programs - Allow storage of jo setups for future use. This saves time
spent reprogramming and lessens the chance of programming errors when tooling is
changed.
nSpeed-Induced Offsets - On many varia le speed machines, the limit switch outputs
have to e adjusted when the speed increases or decreases. This option automatically
adjusts specified circuits ased on speed.
nTime-Based Outputs - Specified outputs can e programmed to turn on ased on
position and turn off ased on time (0.01 - 9.99 seconds).
1.3: Controller Features and Functions
The controller is housed in an all metal case that can e panel mounted. The controller consists of a
keypad, a CPU Board, and a Power Supply I/O Board.
The following features are found on the 1995A Micro-Set.
nDisplay A (3) three-digit LED readout and a 10-place ar graph are provided.
The LED readout displays current angular position and/or RPM and
programming details, while the ar graph shows fault check, program
status, and limit status.
nI/O Mechanical relays, AC solid-state, and DC solid-state relays are
availa le, and any com ination can e specified. The example in the
catalog shows three AC and three DC solid-state relays eing speci-
fied. There is a fixed price adder for any com ination of relays other
than all mechanical (6M). The fault check relay will always e a
mechanical relay regardless of the type of output relays specified.
See Chapter 9: Specifications.
NOTE: The Bar graph will not display expansion oard relay status.
www.comoso.com

3
Installation and Maintenance Manual
Chapter 2: Installation
Chapter 2: Installation
This section describes the installation and wiring of a standard 1995A Micro-Set PLS. Changes to
these instructions should be made as necessary if special options and/or equipment are used.
The 1995A Micro-Set should be installed in an area free of water spray, corrosive gases, flying chips
or other foreign matter. The operating temperature should be between 32 and 12 degrees Fahrenheit,
with less than 9 % relative humidity.
2.1: Mechanical Installation
Mounting the 1995 Micro-Set PLS
The 1995A Micro-Set PLS is designed to be panel mounted. The face of the 1995A can be affected
by water and/or oil spray. Provisions should be made to protect the face of the unit from spraying or
splashing.
Panel cutouts, mounting holes, and sizes for each component are shown on Pages 6 and 7 of the 1995A
catalog section.
The controller should be mounted in the appropriate panel cutout and securely bolted into place using
the four (4) 3/16" diameter mounting holes.
NOTE: In instances where the 1995A is being mounted directly on a mechanical stamping press, care
should be taken to isolate the controller from shock load and vibration.
It is always good design practice to mount the controller in the enclosure as far away from the motor
starters and control relays as possible to minimize the effects of electromagnetic interference (EMI).
Interconnecting wiring also should be routed to minimize EMI coupling.
Mounting the Transducer
The transducer should be mounted securely to the machine in such a manner so as to minimize shock
and vibration. The transducer should be coupled to the moving machine member, thus reducing
excessive axial and radial loads. Coupling methods should minimize backlash and be in accordance
with the system accuracy required.
www.comoso.com

Chapter 2: Installation
Installation and Maintenance Manual
4
2.2: Electrical Installation
The Micro-Set is designed for use in an industrial environment and incorporates extensive transient
suppression circuitry. However, the same general installation rules should be followed that are used on
all microprocessor-based equipment. Incoming AC lines should be from a clean power source and
lines carrying computer level signals should not be routed in the same conduit as high voltage, transient-
producing circuits such as variable speed drives, welders or DC switching circuits.
The 1995A PLS is only used with a single-turn resolver. Wiring for this system is shown in Fig. 11-3,
Chapter 11: Wiring Diagrams. This wiring diagram is applicable for all standard 199 PLSs.
2.3: Wiring Instructions
Attach the pre-wired plug on the resolver transducer cable to the transducer and route the shielded
cable through a separate grounded (earth ground) metal conduit to the panel. Connect the mating half
terminal block to the 1995A PLS. Be sure the shield wire is connected to Pin 1 of the 16-place
connector.
When extension to the factory supplied cable is necessary, a junction box should be used to connect the
wire leads and the cable shields from one cable to the other. The cable shield should be grounded at the
1995 Micro-Set only.
AC line voltage - 11 V AC + 10% 0-60 Hz - should be connected to the 1995A PLS at the AC
power terminals on the 24-place connector.
www.comoso.com

5
Installation and Maintenance Manual
Chapter 3: Programming
Chapter 3: Programming
3.1: Security Input
The security input is often referred to as the Run/Program input. This input is located on the 16-place
terminal strip and is discussed in Chapter 4 Expansion Modules. This input prevents unauthorized
changes to the programmed functions. With the unit in the Program mode, all functions of the control-
ler can be programmed. With the unit in the Run mode, all setpoints, reset-to-preset, motion detect
and other operational functions can be verified, but the programmed information cannot be changed.
3.2: Initialization
The following key commands should be entered on the
keypad to clear all programmed data upon installation and PRIOR to programming. This sequence
clears all programmed data. All operating parameters must be reprogrammed after using this initializa-
tion function.
3.3: Scale Factor
NOTE: Programming of the desired scale factor or the number of outputs will delete all programmed
data held in memory. Therefore, these should be the first steps in your setup procedure.
The 1995A is available with two scale factors 360 or 1,000.
To program the scale factor, the following procedures must be followed
1) Unit must be in the Program mode.
2) Depress
-or-
NOTE: ON UNITS WITH SOFTWARE OPTION P, THE SCALE FACTOR IS
PERMANENTLY SET AT 360.
ENT
CIR# - 9 - 9 5
--
ENT
CIR# - 3 - 6 0
--
ENT
CIR# - 9 - 9 9
--
www.comoso.com

Chapter 3: Programming
Installation and Maintenance Manual
6
3.4: Number of Outputs
The 1995A comes programmed for six outputs, but it is expandable to 30 outputs. However, when
using a Remote Circular Display, the maximum will be 24 outputs.
3.5: Selecting Number of Outputs
Selection of the number of outputs should be done after the desired scale factor is entered, and before
any other programming is done. See Chapter 4 Expansion Modules.
A) To program the number of outputs desired, the unit must be in the Program mode, then depress
. The unit will then show the number of circuits previ-
ously stored. To change the number of outputs desired, enter the number of relays in multiples
of six and depress .
1) Valid numbers for are and
. Remember, if using a Remote Circular Display, the maximum number of
outputs is 24.
NOTE: If a number is entered that is not a multiple of six, the unit will store the next multiple of six.
3. : Multiprogram (Available Only on P Option Units)
The Multiprogram feature allows the storage of multiple sets of output sequences that are
preprogrammed based on the various requirements of different tooling. When dies or tooling are
changed, the new program is simply called up on the keypad and all outputs are automatically set to the
new output sequences. The number of available programs will vary based on the number of output
limits and the number of setpoints programmed on each limit. A typical six-limit system with one ON
and one OFF setpoint per output will be capable of storing twenty programs in memory
A setpoint is one CIR ON or CIR OFF entry. The following formula shows the relationship
between the number of output relays, the number of programs, and the number of setpoints available
per program.
ENT
CIR# - 1 - 7 7
--
ENT
ENT
CIR# - 1 - 7 7
-- 6 12 24 18
30
,,,,
www.comoso.com

7
Installation and Maintenance Manual
Chapter 3: Programming
3.7: Setpoint Formula
Where A = 5 for 6 outputs
= 6 for 12 outputs
= 7 for 18 outputs
= 8 for 24 outputs
= 9 for 30 outputs
Setpoints are in whole numbers (drop decimal).
Example 12 outputs relays with 10 programs
S.P. = 1467 -2 = 24.45 - 2 = 22 Setpoints/Program
10 x 6
The following table shows the relationship between the number of outputs, the number of programs, and
the number of setpoints per program. The table only shows a few of the many combinations that are
possible. Before programming outputs, it is advisable to verify that enough setpoints are available, otherwise
the number of programs may need to be reduced. A setpoint is one CIR ON or CIR OFF entry.
Setpoint/Programs = 1467 - 2
Number of Programs x A
STUPTUO6STUPTUO21STUPTUO81STUPTUO42STUPTUO03
352/1242/1702/1181/1161/1
21/0252/993/534/497/2
9/6281/2142/843/525/3
6/6321/7181/0142/703/5
1/797/7241/3102/852/6
äã
Number of program Resulting in number of setpoints per program.
Programming 1995 PLS for Multiprogram
A) Specify the number of programs desired, unit must be in the Program mode. Depress
See above table
for the capabilities of your unit.
B) Upon entering the above sequence, depressing the key will display the
maximum amount of setpoints per program.
NOTE: A time-based output uses up three setpoints.
ENT
CIR# - 7 - 7 0
-- CIR ON # of Programs - ENT-. -
CIR OFF
www.comoso.com

Chapter 3: Programming
Installation and Maintenance Manual
8
C) will display the total number of setpoints available for use in
the currently selected active program.
D) To display the active program, depress .
To change programs, with the unit in the Program mode, depress
.
NOTE: Program 0 is the first program. If 10 programs were previously selected using Code 770,
there will be programs 0-9.
CIR# 7- 7- -2 ENT-
CIR# - 7-
-
ENT--
ENT
7 1
(0 thru Highest Program Number)
3.8: Setpoints
Programming New Setpoints
A) Unit must be in the Program mode.
B) Select a limit switch circuit for programming. Depress .
The circuit number selected cannot exceed the number of output relays specified earlier using
CIR# 177. See Section 3.5 Selecting Number of Outputs.
C) Depress . The will set the selected relay turn-on
point.
D) Depress . . This will set the selected relay turnoff
point.
1) On units where time-based circuits have been selected, the will be the
time interval that the relay will be active once the ON setpoint has been reached.
E) Multiple ON and OFF setpoints can be programmed on each circuit. All decimal points will
flash when more than one setpoint exists on the selected circuit.
F) An LS (Limit Switch) may not have the same value for both the ON point and the OFF point.
If a value is entered that is already a setpoint for that LS, only the new one will be used. For
example If LS1 had an ON point at 100 and an OFF point of 100 was entered, the ON point
at 100 would be deleted, and the OFF point would then take its place. Assuming that these
were the only setpoints, the output would turn ON at 0 and OFF at 100.
The programmable limits are programmed based on dwell on and dwell off locations. The dwell
on typically represents the location at which a selected limit turns on and the dwell off represents the
location at which the limit turns off. The position locations for the dwell on and dwell off are based
CIR# -
-
(1 thru 30) - ENT
CIR OFF - (Desired Pos) ENT
-
CIR ON - (Desired Pos) ENT
CIR OFF
www.comoso.com

9
Installation and Maintenance Manual
Chapter 3: Programming
on a scale factor corresponding to the 360-degree rotation of the resolver. Example In the foregoing
example, with a 360 scale factor, a dwell on of 0 and a dwell off of 100 would look like this
0100 359
0 20 80 100 180 200 270 359
The shaded area represents the area where the selected limit output relay is energized. Programmable
limit switch outputs offer a unique function which normal rotating cam limits cannot, namely, the ability to
turn a limit on or off more than once in a 360-degree cycle. Multiple dwells allow several dwell on
and dwell off values to be programmed for a particular limit. Example Dwell on settings of 20,
100, 200, and dwell off settings of 80, 180, 270 would look like the following
Another feature of programmable limits is the ability of programming a dwell on or a dwell off only.
If only a dwell on setting is programmed, the output will activate at the dwell on setting and remain
on to 359 degrees. Example Dwell on setting of 180 and dwell off not programmed will result in
the following
0 180 359
Conversely, if only a dwell off setting is programmed, the output will activate from 0 degrees to the
dwell off setting. Example Dwell on not programmed, dwell off set at 180 degrees will result in
the following
0 180 359
The programmable limits also have the ability to shift the dwells to turn on sooner. This can be done
to compensate for mechanical lag in the devices they are controlling as the machine speed increases.
(See Section 3.18 Linear Speed Offset for more details). Limits can also be programmed to turn off
based on timed settings.
www.comoso.com

Chapter 3: Programming
Installation and Maintenance Manual
10
3.9: Clear an Existing Setpoint
A) Unit must be in the Program mode.
B) Depress .
C) Depress or key until setpoint to be cleared is on the display.
D) Depress the key. Upon depression of the key, the setpoint on
the display after Step C is deleted.
E) This keypad sequence must be completed once to clear an ON setpoint and a second time to
clear the OFF setpoint. See Section 3.8 Setpoints
CIR# --
CIR ON
(Output to be Cleared) ENT
CIR OFF
CLR SETCLR SET
3.10: Clear All Setpoints
There are two methods of clearing all setpoints. This is accomplished as follows
A) Unit must be in the Program mode.
B) To clear all of the setpoints in the active program, depress .
The active program is the program currently selected using Code 771. See Section 3.7
Setpoint Formula.
-OR-
C) To clear all the setpoints in all programs, depress .
CIR# - 9 - 1 ENT
ENT
CIR# - 3 - 9
-
1
--
NOTE: CIR# 91 and CIR# 391 only clear out programmed setpoints. They do not clear out Linear
Speed ramps or change circuits that have been selected as Linear Speed or Time-Based;
however, they will clear the setpoints programmed in these circuits.
3.11: Setpoint Availability
Every 1995 PLS has a limit on the number of setpoints that can be stored in memory. On units with the
Multiprogram option, refer to Section 3.7 Setpoint Formula to calculate the maximum amount of
setpoints available.
www.comoso.com

11
Installation and Maintenance Manual
Chapter 3: Programming
On units without Multiprogram, setpoint availability is dependent on the number of outputs enabled.
6 Outputs = 253 Setpoints Available
12 Outputs = 242 Setpoints Available
18 Outputs = 207 Setpoints Available
24 Outputs = 181 Setpoints Available
30 Outputs = 161 Setpoints Available
Refer to the Section 3.5 Selecting Number of Outputs.
3.12: Electronic Offset
The offset key is used to synchronize the digital display with the actual machine position. The Series
1995A PLS has full scale factor offset capabilities, and the offset is held in nonvolatile memory. How-
ever, to eliminate possible problems in the event that a replacement PLS is required, it is good practice
to mechanically synchronize the resolver with the machine and then use the offset key to make final, fine-
tune adjustments.
Programming the Electronic Offset
A) Unit must be in the Program mode.
B) Stop machine at a known location.
C) Depress . After this sequence is
completed, the display will change to the position entered. The display and outputs are now
synchronized with the actual machine position.
OFFSET (Actual Machine Position) ENT
--
3.13: Reset-to-Preset
Remote Reset-to-Preset Value - This option allows the position of the PLS to be reset to a keypad
selected value; this value would be based on an input from a remote contact or proximity switch
mounted at a known location on the machine. Typical uses include compensation for slippage of idler
wheel-driven resolvers, cable stretch, gear train backlash, as well as, for synchronizing outputs with the
leading edge of products moving through a machine.
The reset-to-preset function of the 1995A requires an isolated contact closure. The isolated contact is
used as an input to the 1995A PLS; upon closure, it will reset the unit to its preprogrammed reset value.
If an auxiliary contact is available, it can be wired to the 1995A PLS to perform this function. If an
auxiliary contact is not available, a reset input relay (Part No. SD0395100) can be purchased and wired
to a 110V AC circuit to provide this output.
www.comoso.com

Chapter 3: Programming
Installation and Maintenance Manual
12
Programming Reset-to-Preset alue
The Reset-to-Preset Value is programmed by entering the following
A) Unit must be in the Program mode.
B) The Reset-to-Preset must first be enabled before you can store any values. To accomplish this,
depress . A zero (0) disables a
ENT
CIR# - 1 - 6 6
-- (0 or 1) - ENT -
function and a one (1) enables it.
C) Once the Reset-to-Preset has been enabled, you can store a value in memory. This is accom-
plished by depressing ENT
CIR# - 1 - 6 0
-- (Desired Reset Value) - ENT -
NOTE: Valid numbers for CIR# 160 are zero (0) through the programmed scale factor, less one (1).
.
3.14: Motion Detector
A programmable Motion Detect output will energize a relay when the transducer speed exceeds the
customers preprogrammed RPM value.
The motion detector is set by entering the following
A) Unit must be in the Program mode.
B) The motion detect must first be enabled before you can store any values. To accomplish this,
depress . A one (1) will enable the motion
ENT
CIR# - 5 - 5 - (0 or 1)
- ENT -
detect output circuit, and LS6 will now be your motion detect output relay. If a zero (0) is
entered, the motion detect feature is disabled and LS6 will function as a normal limit switch.
C) To set the value at which the motion detect relay energizes, depress
ENT
CIR# - 1 - 7 6
-- (RPM Value) - ENT -
NOTE: A CIR #176 can only be entered if the motion detect option is enabled.
.
www.comoso.com

1
Installation and Maintenance Manual
Chapter 3: Programming
3.15: Power-Up in a Position or RPM
The 1995A can power up displaying either Position or RPM data.
The power-up mode is programmed by entering the following
A) Unit must be in the Program mode.
B) Depress . If a zero (0) is entered,
ENT
CIR# - 1 - 6 3
-- (0 or 1) - ENT -
positional data will be displayed upon power-up; if a one (1) is entered, the unit will power up
displaying RPM.
3.1 : Decimal Point Programming
A continuous, nonfloating decimal point may be programmed on the display. If a scale factor is selected
that needs a decimal point in order to properly display its resolution in engineering units, the following 50
series codes are used
50 - No decimal point;
clears existing decimal point 123
51 - Tenths 12.3
52 - Hundreths 1.23
To program a decimal point, enter the following
A) Unit must be in the Program mode.
B) Depress .
Example CIR# 50 = 123
CIR# 51 = 12.3
CIR# 52 = 1.23
ENT
CIR# - 50 or 51 52
or -
www.comoso.com

Chapter 3: Programming
Installation and Maintenance Manual
14
3.17: Enable/Disable Outputs
During setup, the outputs may be enabled or disabled. When outputs are selected to be disabled, the
status LEDs and the relays will be OFF. The unit must be in the Program mode to disable the outputs;
as soon as the unit is switched to the Run mode, the outputs will be enabled.
The enable/disable feature is programmed as follows
A) Unit must be in the Program mode.
B) Depress
CIR# 380 Enables the Outputs.
CIR# 381 Disables the Outputs.
CIR# (380 or 381)
- ENT -.
NOTE: If you try to disable the outputs in the Run mode, the unit will display EEE.
3.18: Linear Speed Offset (Available Only on Option P Units)
This feature allows limit switch outputs, one through six, to be programmed to automatically advance
and retard as machine velocity varies. The number of circuits affected by speed offset, the amount of
offset, and the RPM range over which the offset develops are all keypad programmable. The amount
to offset per RPM change will be the same for all outputs selected for this type of operation. This
feature is used to compensate for the mechanical lag in machine controls.
The 16-step linear speed offset feature allows up to 16 different offset steps to be selected and a
different amount of positive or negative (advance or retard) offset to be programmed between each of
the sixteen steps.
Access Codes 501 through 516 are used to select the successive steps that define a ramp between the
various offset values. That is, Code 501 is used to access and program the ramp between 0 RPM and
the RPM value assigned to the first step; Code 502 is used to access and program the ramp between
the RPM value of the first step and the RPM value assigned to the second step; and so on.
After using the access code to call up a step for programming, the CIR ON key is depressed, followed
by the total amount of offset (from zero offset) to be applied to the circuit at the specified RPM value.
The CIR OFF key is depressed next, followed by the RPM value of that step. The programmed offset
value will be the total amount of offset being applied to the circuits from their zero offset starting values.
This allows the circuits to be advanced or retarded between any two steps. See Section 3.19
Programming 1995 PLS for Linear Speed.
www.comoso.com

15
Installation and Maintenance Manual
Chapter 3: Programming
The graph above shows an example of four steps of linear offset in which the output circuits are being
advanced in the first two steps, retarded between the second and third, and remaining unchanged
between the third and fourth. The first step (501) is programmed to linearly advance the selected
outputs by 20 degrees between 0 and 60 RPM. Circuits originally programmed to turn on at 150
degrees and off at 350 degrees will be turning on at 130 degrees and off at 330 degrees while at 60
RPM. The second step (502) is programmed to advance these same outputs to a total of 50 degrees
as RPM rises between 60 and 100 RPM. The example circuit mentioned above that was originally
programmed to turn on at 150 degrees and off at 350 degrees will now be turning on at 100 degrees
and off at 300 degrees while at 100 RPM. The third step (503) is programmed to retard the circuits
back to a total of 30 degrees as RPM continues to rise from 100 to 140 RPM. The example circuit,
originally programmed to turn on at 150 degrees and off at 350 degrees is now turning on at 120
degrees and off at 320 degrees while running at 140 RPM. The fourth step (504) is programmed to
maintain a fixed 30 degrees of total offset between 140 and 200 RPM.
NORMAL PLS DWELL
0 150 50 59
1ST COMPENSATION AT 60 RPM
0 1 0 590
2ND COMPENSATION AT 100 RPM
0 100 00 59
RD COMPENSATION AT 140 RPM
0 120 20 59
4TH COMPENSATION AT 200 RPM
0 120 20 59
The offset (advance or retard) is applied linearly between each step, and the offset follows the same
curve as RPM decreases. Example At 80 RPM, offset value would be 35°.
www.comoso.com

Chapter 3: Programming
Installation and Maintenance Manual
16
3.19: Programming 1995 PLS for Linear Speed
A) Unit must be in the Program mode.
B) Select the number of circuits that will be offset based on RPM. The affected circuits will always
start with CIR# 1 and will follow in ascending sequence to the number specified. Depress
ENT
CIR# -- (1 thru 6)
- -
80
NOTE: LS6 cannot be programmed for Linear Speed if it is set for Motion detect. See Section 3.14
Motion Detector
NOTE: On units built prior to June 1, 1992, the Linear Speed Offset had only a single ramp offset.
CIR# - 81 - ENT - CIR ON = Offset Amount
CIR# - 81 - ENT - CIR OFF = RPM Value
Codes 501 - 516 will result in a programming error on this older software.
C) Starting with Circuit 501, program the amount of offset and RPM point for the first offset ramp.
Next use Circuit 502 to program both values for the second offset ramp. Continue with Circuit
503 and onward in ascending order until all desired ramps are programmed.
1) CIR# - 501 thru 516 - CIR ON
--(Specify the total amount of offset
from the original output settings) -
ENT
CIR# - 501 thru 516 - CIR OFF--(Specify the RPM at which the
above specified amount of offset occurs.)
ENT
2)
NOTE: If CIR# 501 - CIR OFF is set to zero, all linear speeds will be disabled.
3.20: Minimum Speed Disable
The Minimum Speed Disable sets the minimum speed at which the Linear Speed will affect the outputs.
Below the programmed speed, the Linear Speed outputs will not be enabled.
The Minimum Speed feature is programmed as follows
A) Unit must be in the Program mode.
B) Depress . This sets the Minimum Speed at
which the Linear Speed will affect the outputs. Below the programmed speed, the Linear
Speed outputs will not be enabled.
ENT
CIR# -- (RPM Value)
- ENT -
85
ENT
.
.
ENT
www.comoso.com