Despatch MIC 1162 User manual

REV. 4-99
E-89
P.N. 136107
MIC 1162
1/16 DIN HIGH/LOW LIMIT CONTROLLER
REFERENCE MANUAL
Copyright © 1999 by Despatch Industries

i
TABLE OF CONTENTS
TABLE OF CONTENTS................................................................................................... i
SECTION 1: PRODUCT DESCRIPTION....................................................................... 1
1.1 General.................................................................................................................1
1.2 Displays................................................................................................................1
1.3 Alarms ..................................................................................................................1
1.4 Process Variable/Setpoint Value Retransmission Output .................................... 2
SECTION 2: INSTALLATION AND WIRING..................................................................3
2.1 General Information.............................................................................................. 3
2.2 Wiring Guidelines.................................................................................................5
2.2.1 Installation Considerations.............................................................................5
2.2.2 AC Power Wiring ...........................................................................................6
2.2.3 Wire Isolation.................................................................................................6
2.2.4 Use Of Shielded Cable ..................................................................................7
2.2.5 Noise Suppression At The Source.................................................................7
2.3 Sensor Placement (Thermocouple or RTD) ......................................................... 9
2.4 Input Connections...............................................................................................10
2.5 Output Connections............................................................................................ 13
SECTION 3: OPERATION........................................................................................... 15
3.1 Power Up Procedure ..........................................................................................15
3.2 Keypad Operation...............................................................................................15
3.3 Displays..............................................................................................................16
3.3.1 Alarm Status Display....................................................................................16
3.3.2 Over-Range/Under-Range Display.............................................................. 16
3.4 Front Panel Indicators........................................................................................ 17
3.5 Exceeding Limit Setpoint....................................................................................17
3.6 Annunciator ........................................................................................................18
3.7 Remote Reset (Optional)....................................................................................18
SECTION 4: CONTROL MODE................................................................................... 19
SECTION 5: SETPOINT CHANGE MODE...................................................................21
SECTION 6: CONFIGURATION.................................................................................. 23
SECTION 7: SET-UP MODE........................................................................................27
SECTION 8: ENABLE MODE........................................................................................ 31
SECTION 9: CALIBRATION ........................................................................................ 33
APPENDIX A: BOARD LAYOUT - JUMPER POSITIONING.........................................37
APPENDIX B: HARDWARE DEFINITION CODE .........................................................41
APPENDIX C: INPUT RANGE CODES......................................................................... 43
APPENDIX D: SPECIFICATIONS.................................................................................45
APPENDIX E: ORDER MATRIX....................................................................................49
APPENDIX F: SOFTWARE REFERENCE SHEET....................................................... 51
Despatch Product Warranty..........................................................................................53

ii

1
SECTION 1: PRODUCT DESCRIPTION
1.1 General
This instrument is a microprocessor based single loop controller capable of measuring
and displaying temperature, pressure, flow, and level from a variety of inputs. The
control is configurable to be either high-limit, low-limit, or both types.
Control functions, alarm settings and other parameters are easily entered through the
front keypad. E2Technology (100 year life) protects against data loss during AC power
outages.
The input is user configurable to directly connect to either thermocouple, RTD, mVDC,
VDC or mADC inputs. The instrument can operate from either a 90-264 VAC, 50/60 HZ
power supply, or optional 24V AC/DC power supply.
1.2 Displays
Each instrument is provided with dual displays and status indicators as shown in Figure
1 -1. Typically, the upper display displays the value of the process variable, while the
lower display displays the setpoint value. Alternate displays can be selected in the
Setup Mode.
1.3 Alarms
Alarm indication is standard on all instruments. Up to two alarm outputs are optional.
Alarm type may be set as Process Direct or Reverse (high or low), Logical Combination
of the two alarms, Annunciator Direct or Reverse, High Limit, or Low Limit. Alarm
status is indicated by LED.

2
FIGURE 1-1 Keys and Indicators
1.4 Process Variable/Setpoint Value Retransmission Output
If the instrument is specified with this option, this output may be scaled over
any desired range and re-transmitted, through optional Output 3.

3
SECTION 2: INSTALLATION AND WIRING
2.1 General Information
Electrical code requirements and safety standards should be observed and installation
performed by qualified personnel.
The electronic components of the instrument may be removed from the housing during
installation. To remove the components, grip the side edges of the front panel and pull
the instrument forward. During re-installation, the vertically mounted circuit boards
should be properly aligned in the housing.
Ensure that the instrument is correctly orientated. A stop will operate if an attempt is
made to insert the instrument incorrectly.
Recommended panel opening sizes are illustrated in Figure 2-1. After the opening is
properly cut, insert the instrument into the panel opening. Ensure that the panel gasket
is not distorted and that the instrument is positioned squarely against the panel. Slide
the mounting clamp into place on the instrument and push it forward until it is firmly in
contact with the rear face of the mounting panel.
Note: The mounting clamp tongues may engage either on the sides or the
top/bottom of the instrument housing. Therefore when installing several
instruments side-by-side in one cut-out, use the ratchets on the top/bottom
faces.

4
FIGURE 2-1
Panel Cut-Out Dimensions
FIGURE 2-2
Main Dimensions

5
FIGURE 2-3
Panel Mounting the Controller
2.2 Wiring Guidelines
Electrical noise is a phenomenon typical of industrial environments. The following are
guidelines that must be followed to minimize the effect of noise upon any
instrumentation.
2.2.1 Installation Considerations
Listed below are some of the common sources of electrical noise in the
industrial environment:
•Ignition Transformers
•Arc Welders
•Mechanical contact relay(s)
•Solenoids
Before using any instrument near the device listed, the instructions below
should be followed:

6
1. If the instrument is to be mounted in the same panel as any of the listed devices,
separate them by the largest distance possible. For maximum electrical noise
reduction, the noise generating devices should be mounted in a separate enclosure.
2. If possible, eliminate mechanical contact relay(s) and replace with solid state relays.
If a mechanical relay being powered by an instrument output device cannot be
replaced, a solid state relay can be used to isolate the instrument.
3. A separate isolation transformer to feed only instrumentation should be considered.
The transformer can isolate the instrument from noise found on the AC power input.
4. If the instrument is being installed on existing equipment, the wiring in the area
should be checked to insure that good wiring practices have been followed.
2.2.2 AC Power Wiring
Neutral (For 115 VAC)
It is good practice to assure that the AC neutral is at or near ground potential. To verify
this, a voltmeter check between neutral and ground should be done. On the AC range,
the reading should not be more than 50 millivolts. If it is greater than this amount, the
secondary of this AC transformer supplying the instrument should be checked by an
electrician. A proper neutral will help ensure maximum performance from the
instrument.
2.2.3 Wire Isolation
Three voltage levels of input and output wiring may be used with the unit:
•Analog input or output (i.e. thermocouple, RTD, VDC, mVDC, or mADC)
•SPDT Relays
•AC power
The only wires that should run together are those of the same category. If they need to
be run parallel with any of the other lines, maintain a minimum 6 inch space between
the wires. If wires must cross each other, do so at 90 degrees. This will minimize the
contact with each other and reduces "cross talk". "Cross Talk" is due to the EMF
(Electro-Magnetic Flux) emitted by a wire as current passes through it. This EMF can
be picked up by other wires running in the same bundle or conduit.
In applications where a High Voltage Transformer is used (i.e. ignition systems) the
secondary of the transformer should be isolated from all other cables.

7
This instrument has been designed to operate in noisy environments, however, in some
cases even with proper wiring it may be necessary to suppress the noise at its source.
2.2.4 Use Of Shielded Cable
Shielded cable helps eliminate electrical noise being induced on the wires. All analog
signals should be run with shielded cable. Connection lead length should be kept as
short as possible, keeping the wires protected by the shielding. The shield should be
grounded at one end only. The preferred grounding location is the sensor, transmitter
or transducer.
2.2.5 Noise Suppression At The Source
Usually when good wiring practices are followed no further noise protection is
necessary. Sometimes in severe electrical environments, the amount of noise is so
great that it has to be suppressed at the source. Many manufacturers of relays,
contactors, etc. supply “surge suppressors" which mount on the noise source.
For those devices that do not have surge suppressors supplied, RC (resistance-
capacitance) networks and/or MOV (metal oxide varistors) may be added.
Inductive Coils - MOV's are recommended for transient suppression in inductive coils
connected in parallel and as close as possible to the coil. See Figure 2-4. Additional
protection may be provided by adding an'RC network across the MOV.

8
FIGURE 2-4
Contacts - Arcing may occur across contacts when the contact opens and closes. This
results in electrical noise as well as damage to the contacts. Connecting a RC network
properly sized can eliminate this arc.
For circuits up to 3 amps, a combination of a 47 ohm resistor and 0.1 microfarad
capacitor (1 000 volts) is recommended. For circuits from 3 to 5 amps, connect 2 of
these in parallel. See Figure 2-5.
FIGURE 2-5

9
2.3 Sensor Placement (Thermocouple or RTD)
Two wire RTD's should be used only with lead lengths less than 10 feet.
If the temperature probe is to be subjected to corrosive or abrasive conditions, it should
be protected by the appropriate thermowell. The probe should be positioned to reflect
true process temperature:
In liquid media - the most agitated area
In air - the best circulated area
FIGURE 2-6
Wiring Label

10
2.4 Input Connections
In general, all wiring connections are made to the instrument after it is installed. Avoid
electrical shock. AC power wiring must not be connected to the source distribution
panel until all wiring connection procedures are completed.
FIGURE 2-7A
Main Supply
The instrument will operate on 90-264V AC 50/6OHz main supply. The power
consumption is approximately 4 VA. Connect the line voltage, hot and neutral, to
terminals 9 to 10 respectively as illustrated below.
FIGURE 2-7B
24V (Nominal) AC/DC Supply
The supply connections for the 24V AC/DC versions of the instrument are
shown below.
FIGURE 2-8
Thermocouple (T/C) Input
Make thermocouple connections as illustrated below. Connect the positive
leg of the thermocouple to terminal 5 and the negative leg to terminal 4.

11
FIGURE 2-9
RTD Input
Make RTD connections as illustrated below. For a three wire RTD, connect the
resistive leg of the RTD to terminal 6 and the common legs to terminals 4 and 5. For a
two wire RTD, connect one leg to terminal 5 and the other leg to terminal 6 as shown
below. A jumper wire supplied by the customer must be installed between terminals 4
and 5. Input conditioning jumper must be positioned correctly (see Appendix A) and
Hardware Definition Code must be correct (see Appendix B).
FIGURE 2-10
Volt, mV Input
Make volt and millivolt connections as shown below. Terminal 5 is positive and
terminal 4 is negative. Input conditioning jumper must be positioned correctly (see
Appendix A) and Hardware Definition Code must be correct (see Appendix B).
mADC Input
Make mADC connections as shown below. Terminal 4 is positive and terminal 6 is
negative. Input conditioning jumper must be positioned correctly (see Appendix A) and
Hardware Definition Code must be correct (see Appendix B).

12
FIGURE 2-11
Remote Digital Communications - RS485
Make digital communication connections as illustrated below.
FIGURE 2-12
Remote Reset
Connections are made as illustrated below for remote reset.

13
2.5 Output Connections
FIGURE 2-13
Relay Output 1
Connections are made to Output 1 relay as illustrated below. The contacts are rated at
5 amp resistive, 120/240 VAC.
FIGURE 2-14
Relay Output 2 (Alarm or Annunciator)
Connections are made to Output 2 relay as illustrated below. The contacts
are rated at 2 amp resistive, 120/240 VAC.
FIGURE 2-15
Relay Output 3 (Alarm or Annunciator)
Connections are made to Output 3 relay as illustrated below. The contacts are rated at
2 amp resistive, 120/240 VAC.

14
FIGURE 2-16
mADC Output 3 (Recorder Output Only)
Make connections for DC output 3 as illustrated below.

15
SECTION 3: OPERATION
3.1 Power Up Procedure
Verify all electrical connections have been properly made before applying power to the
instrument.
During power up, a self-test procedure is initiated during which all LED segments in the
two front panel displays appear and all LED indicators are ON. When the self-test
procedure is complete, the instrument reverts to normal operation.
Note: When power is first applied, a delay of about 3 seconds will be seen before the
LEDs will light.
3.2 Keypad Operation
RESET KEY
This key is used to:
1. Reset the limit condition after the process is within the limit
2. Acknowledge that the limit has been exceeded
3. Confirm entry in Configuration Mode
SCROLL KEY
This key is used to:
1. Select a parameter to be viewed or adjusted.
2. Display enabled modes of operation.
3. Display a mode parameter value.
4. Advance display from a parameter value to the next parameter code.
5. With the DOWN key to view the current Hardware Definition Code setting.
UP KEY
This key is used to:
1. Increase the displayed parameter value.
2. Increase setpoint.
3. Reset MAX/MIN HOLD and TIME EXCEED.
DOWN KEY
This key is used to:
1. Decrease the displayed parameter value.
2. Decrease setpoint.
3. Reset MAX/MIN HOLD and TIME EXCEED.
4. With the SCROLL key to view the current Hardware Definition Code setting.

16
3.3 Displays
During configuration the upper display shows the parameter setting. The lower display
shows the parameter code (tag name) for the currently selected parameter. During
operation, the upper display shows the value of the process variable. The lower
display shows the setpoint value. The operation display can be altered by the Display
parameter in the Setup mode.
3.3.1 Alarm Status Display
The user may view the status of the instrument's alarm(s) by depressing the SCROLL
key until the lower display shows the legend "ALSt" and the upper display shows the
alarm status in the following format:
NOTE: This display is available only if one or more of the alarms is/are active.
3.3.2 Over-Range/Under-Range Display
If the process variable attains a value higher than the input scale maximum
limit, the upper display will show: