Qualitrol 118 Series User manual
Electronic Temperature Monitor
ECN-27644 2July 7, 2010
TABLE OF CONTENTS
Table of Contents_________________________________________________________________ 2
Overview _______________________________________________________________________ 3
QualiTROL Electronic Temperature Monitor..........................................................................3
QualiTROL................................................................................................................................4
About This Manual....................................................................................................................4
Installation ______________________________________________________________________ 5
Mounting of the Temperature Monitor.....................................................................................5
Primary Power...........................................................................................................................6
Sensors.......................................................................................................................................6
Relay Contacts...........................................................................................................................6
mA Output.................................................................................................................................6
RS-232 Link...............................................................................................................................7
Operation_______________________________________________________________________ 8
Temperature Display.................................................................................................................8
Status Lamps .............................................................................................................................8
Alarm Audible ...........................................................................................................................8
Push-Buttons..............................................................................................................................8
Fan Exerciser.............................................................................................................................9
Functional Specification __________________________________________________________ 10
Setup Software__________________________________________________________________ 11
Installation...............................................................................................................................11
File ...........................................................................................................................................11
Configuration...........................................................................................................................11
Appendix A -Manual Setpoint Adjustment___________________________________________ 14
Appendix B -Thermocouple Accuracy ______________________________________________ 15
Appendix C -Error Codes ________________________________________________________ 16
Appendix D -Using the Model 118 in the European Community _________________________ 17
Appendix E -Modbus Communications _____________________________________________ 18
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OVERVIEW
QualiTROL Electronic Temperature Monitor
The Model 118 Electronic Temperature Monitor (ETM) can monitor up to 3
thermocouples in ventilated dry type transformer windings, display the current
winding temperatures and operate relays by comparing the highest of the 3
winding temperatures to stored set point temperatures.
The ETM provides the following standard features:
•Monitors 3 type K thermocouples.
•Displays each of the 3 thermocouple temperatures as well as the maximum
temperature stored.
•Displays the channel that caused the stored maximum temperature.
•Operates a high contact rating SPST relay with fuse protected contacts to
control Cooling fans.
•A Manual Fan Control provides the capability to force the Fans to turn ON.
•A Yellow LED Indicates that the Fans are ON.
•A Fan exerciser circuit will turn the Fans ON for a short time at periodic
intervals (ON time and interval is programmable).
•Operates a relay with a SPDT contact when one of the inputs exceeds the
ALARM setting.
•A RED LED indicates that the ALARM is ON
•An internal audible device (buzzer) sounds when alarm is ON. Audible can be
silenced without changing state of Alarm Relay.
•The ALARM relay is normally energized so that ALARM is initiated on
power failure. All other relays are normally de-energized.
•If a thermocouple goes open circuit, it is detected, the ALARM operates and
the faulty channel displays “---“. A failed thermocouple will not cause a
TRIP.
•Operates a relay with a SPDT contact when one of the inputs exceeds the
TRIP setting.
•A RED LED indicates that the TRIP relay is ON
•A TEST function shows the stored set points, shows the internal temperature
of the ETM, and tests the digital display, all LED’s and the buzzer.
•A 0 to 1 mA output is provided which is proportional to the highest of the 3
input temperatures.
•An RS-232 data line is used to setup the programmable parameters of the
unit.
•Prime Power can be jumpered to be 120 or 230/240 VAC 50/60Hz
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•The ETM is panel mount through a cutout.
The ETM provides the following OPTIONS that must be specified at time of
order:
•A second fan control relay with separate power feed and fuse.
•A 4 to 20mA output in place of the 0 to 1mA output.
•Prime power of 277 VAC instead of 120/230/240 VAC
•Packaged in a panel mount enclosure with a hinged front panel for wiring
access.
•RS-485 communications port with Modbus protocol.
QualiTROL
QualiTROL has been a leader in supplying pressure, liquid level, and temperature
controls since 1945. An ISO 9001 system certified company; we are committed to
providing you with quality and reliability, both in our products and in our service.
About This Manual
This manual provides all the information you will need to install, setup, and
operate your QualiTROL Electronic Temperature Monitor. It is organized into
the following sections:
Installation —Step-by-step, illustrated instructions to guide you through
mounting, supplying power to, and wiring your Temperature Monitor.
Operation —A description of use during transformer operation, as well as easy
instructions on how to perform a system test while the transformer is in service.
Functional Specification —A detailed functional specification of the unit.
Setup Software —Step-by-step, instructions to guide you through configuration
of the Temperature Monitor to meet your specific needs.
Appendix A —Step-by-step, instructions to guide you through the manual
adjustment of setpoints of the Temperature Monitor.
Appendix B —Guides you through the installation considerations and the method
of testing a thermocouple equipped ETM for accuracy.
Appendix C —Guides you through the possible error codes that may be
displayed, the condition that resulted in the error code and the situations effect on
the Temperature Monitor.
Appendix D —Guides you through special requirements in order to use the
Temperature Monitor in the European community.
Appendix E —Step-by-step, instructions to guide you through setup of the
Temperature Monitor for use with Modbus communications.
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INSTALLATION AND WIRING
Mounting of the Temperature Monitor
The 118 mounts in a rectangular cutout in a panel and is secured by four (4) ¼”
bolts. See Figure 1; 118 Dimensions.
Figure 1; 118 Dimensions
The 118H mounts in a rectangular cutout in a panel and is secured by four (4) ¼”
bolts. See Figure 2; 118H Dimensions.
Figure 2; 118H Dimensions
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Primary Power
Primary Power is connected to TB3-3 and TB3-4 with an Earth Ground
connection to TB2-11. This connection provides power to the 118 unit and to the
contact of Fan Control Relay #1. If the dual fan relay option is provided then the
power for Fan Control Relay #2 is connected to TB3-7 and TB3-8. See Figure 3;
Wiring Diagram.
NOTE: Jumpers on TB2-7,8,9,10 must be set to match the Primary voltage being
used. For 120 VAC, connect TB2-7 & 8 and connect TB2-9 & 10. For
230/240 and 277 VAC, connect TB2-8 & 9. Note: the 277 VAC units
have some internal differences -DO NOT connect 277 VAC to a
120/230/240 VAC unit.
Sensors
The three thermocouple sensors are connected to TB1-1(+), 2(-); TB1-3(+), 4(-)
and TB1-5(+), 6(-). See Figure 3; Wiring Diagram.
To connect the Type K thermocouples, the YELLOW lead is connected to the
positive terminal (1,3 or 5) and the RED lead is connected to the negative terminal
(2,4 or 6).
If no thermocouple is connected to an input, those input terminals must be shorted
together. This will prevent the ETM from reporting an alarm condition due to a
failed input, and will cause that channel to show the internal temperature of the
ETM. If the channel is not used, it can be turned OFF using the setup software,
but the terminals still need to be shorted together.
Relay Contacts
FAN #1 -The #1 fan contacts are internally connected to the primary power
through a 20A fuse internal to the ETM. Connect the #1 Fans to TB3-1 & 2.
FAN #2 -If the optional second fan relay is installed, it controls Fans through a
20A fuse connected to TB3-5 & 6. Note, the #2 Fan circuit is electrically separate
from the #1 Fan circuit and is powered from TB3-7 & 8
ALARM -SPDT (form C) contacts are provided at TB2-1, 2 & 3 to indicate an
alarm condition. This relay is usually set to be energized in the normal state so
that the power off state will cause an alarm (Fail Safe). Jumpers on the PCB set
the normal state of the relay.
NOTE: Under normal conditions below setpoint, TB2-1&2 are closed and
TB2-2&3 are open. Under alarm condition, TB2-2&3 will close.
TRIP -SPDT (form C) contacts are provided at TB2-4, 5 & 6 to indicate that the
temperature being monitored has reached the trip state. This relay is usually set to
be de-energized in the normal (non-failsafe) state. The normal state of the relay is
set by software via the RS-232 port.
NOTE: Under normal (default) conditions below setpoint, TB2-4&5 are open
and TB2-5&6 are closed. Under alarm conditions, TB2-4&5 will
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close. The operation of this relay can be changed to be opposite of
that described above (failsafe) through the software configuration.
mA Output
A milliamp output current loop is available at TB1-7(+) & 8(-) that provides a
current proportional to the highest temperature.
RS-232 Link
An RS-232 data link is provided for setting up the 118 ETM. TB1-9(RCV) is the
data going to the ETM. TB1-10(XMIT) is the data coming from the ETM. TB1-
11(GND) is the ground connection for the data link. Refer to the Setup Software
section of this manual for more detailed information.
NOTE: Wires should be connected to the RS-232 terminals only during
parameter setup. No permanent field wires should be connected to these
terminals.
RS-232 XMIT
10 10
FANS #1
20 A MAX
FUSE 1A AGC-1
11
TB3 1
FAN #2 POWER
30 A
GND
NLFANS #2 N
30 A
32 4
GROUND
FRAME
20 A MAX
567
11
L
8
MADE IN USA
ALARM 2
6
8
9
7
4
TRIP 5
3
TB2 1
RED H
10 A 2
RCV
OUTPUT
mA
RED 6
8
9
7+
YELLOW
YELLOW
CENTER
10 A
RED 4
5
RIGHT
+
3+
O
S
E
L
P
U K
MY
C
OE
P
R
ET
TB1
YELLOW 1
LEFT
+
MA OUT 0-1 4-20
T
REPLACE FUSES WITH
THOSE OF THE SAME
RATING.
120/240 V~ 277 V~
ALARM
SHOWN IN
POWER
OFF STATE
RELAY
120 VAC
240/277
VAC
INPUT
POWER
7-8,9-10
8-9
JUMPER
TB2
INPUT
POWER
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Figure 3. Wiring Diagram
RS-485 Link (optional)
The optional RS-485 data link is accessed through a terminal block connector on
the side of the unit. This provides a method of communicating with a remote
master station using Modbus RTU protocol. Refer to Appendix E of this manual
for additional information. See Figure 4; RS-485 Wiring Diagram.
NOTE: DO NOT install or remove jumper or connector when the unit is
powered.
Figure 4. RS-485 Wiring Diagram –118P
Figure 4. RS-485 Wiring Diagram –118H
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OPERATION
Temperature Display
The temperature display consists of a 3-digit, seven segment LED display that can
show temperatures from 0°C to 250°C and 4 individual LED’s that identify the
temperature being displayed. The display shows each reading for approximately
one second and then automatically steps to the next reading.
The display shows the three winding temperatures and then the maximum stored
temperature. While the maximum stored temperature is displayed, both the MAX
LED and the LED representing the winding that caused the maximum reading turn
ON.
Status Lamps
Three LED’s are provided that indicate the status of the output relays. Refer to
Figure 4, Front Panel Display.
•A yellow FAN LED indicates that the FAN relay is activated.
•A red ALARM LED indicates that the ALARM relay is in the ALARM
state.
•A red TRIP LED indicates that the TRIP relay is in the TRIP state.
Audible Alarm
An internal Buzzer sounds each time the ALARM becomes active. The buzzer
can be silenced by pressing the SILENCE push-button. The buzzer will then turn
OFF and remain OFF until a new ALARM occurs.
Push-Buttons
Pressing the MANUAL FAN button will force the FAN relay to activate. The
FANS will stay ON until the button is pressed again. A red LED on the
MANUAL FAN button indicates whether the manual FAN ON function is active.
Pressing the button to release the MANUAL FAN function while the temperature
is above the FAN ON setpoint will turn OFF the MANUAL FAN red LED but
will NOT turn OFF the FANS. Thus, the MANUAL FAN button can force the
FANS ON but cannot force the FANS OFF.
Pressing the SILENCE/TEST button while the buzzer is sounding will silence the
buzzer until the next new alarm condition occurs.
Pressing the SILENCE/TEST button while the buzzer is not sounding will start a
TEST sequence. The TEST sequence does the following at two-second intervals:
Display the FAN ON temperature setpoint and light the FAN LED.
Display the ALARM temperature setpoint, light the ALARM LED and sound the
buzzer.
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Display the TRIP temperature set point and light the TRIP LED.
Display the ambient temperature inside the ETM.
Display 888 on the temperature display, light the 4 temperature source LED’s and
light the MANUAL FAN LED.
Pressing the MAX RESET button will clear the memory of the maximum stored
temperature causing the current highest winding temperature to become the new
maximum stored temperature.
Figure 4. Front Panel
Fan Exerciser
The unit has a built in Fan Exerciser function that can turn the fans on for a short
period of time at periodic intervals. The default setting is for 1 minute every 7
days.
The Fan Exerciser can be configured to be active or inactive. When inactive, it
will never turn the fans ON.
If the Fan exerciser is active, it will start timing with a fan run period when the
unit is powered up. Thus, if the Fan Exerciser run time is 1 minute, the fans will
turn ON for 1 minute after power up. If the Fan Exerciser run time is set for 15
minutes, the fans will turn ON for 15 minutes after power up.
LABEL OPTIONS
LEFT
1
A
U
CENTER
2
B
V
RIGHT
3
C
W
MAX
MAX
MAX
MAX
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FUNCTIONAL SPECIFICATIONS
Performance: Input Power: 120/240 VAC, ±15%, 50/60 Hz or 230 VAC, ±10%, 50/60 Hz
277 VAC, +8%, -15%, 50/60 Hz (optional)
Measurement
Range: 0°C -250°C
Display
Resolution: 1°C increments
Accuracy: ±2°C ±one count under normal conditions.
±5°C ±one count under extreme conditions.
Extreme Conditions are: Ambient temperature colder than –10°C, or
thermocouple temperature –unit temperature >210°C.
Memory
Retention: 40 years (with power off)
Contact Ratings
Fans:
Alarm & Trip:
Volts Resistive Horsepower
120 VAC 30 amps 1 Hp
240 VAC 30 amps 2 Hp
120 VAC 10 amps -------
240 VAC 8 amps -------
Remote Output
Current Loop: 0 to 1 mA = into 10,000Ωmax. load
4 to 20 mA = into 500 Ωmax. load
Accuracy ±1% of full scale reading.
Fan Exerciser: Fan Run Time –1 to 120 minutes.
Fan Cycle Time –0.01 to 30.0 days.
Time starts at power up.
Environment: Operating
Temperature: -30°C to +72°C
Storage
Temperature: -50°C to +72°C
Relative
Humidity: 10% to 90% non-condensing
Hi-pot: 1500 VAC 50/60 Hz for 1 minute, relay contacts and power input to
all other terminals and earth ground.
Vibration: 50/180 Hz @ .004 inch displacement.
Shock: 10 G’s in 3 orthogonal planes.
Transient Suppression per ANSI 37.90a-1989 oscillatory waveform test.
This device is protected against Radio Frequency Interference.
Mechanical:
(Panel Mount
Unit)
Front Panel: 6.5” [165.1mm] Wide x 9.1” [231.1mm] High.
Graphic overlay UV resistant for outdoor use.
Mounting: Panel mount thru 5.4” [137.2mm] Wide x 8.0” [203.2mm] High
cutout.
Depth: 3.2” [81.3mm]
Weight: 3 lbs.
Terminals: Screw terminal; maximum 12 gage wire
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Approvals: Registered per UL standard 873.
Registered per Canadian Standard C22.2 No. 24-93.
Declaration of Conformance CE
SETUP SOFTWARE
Note: The software is NOT supplied with every unit –It can be used to
configure multiple varieties of units. It is ordered as a separate line
item (KIT-032-1). This includes a CD with all of the software, and a
communications cable to connect it to all of the various models.
The ETM Configuration software is a Windows based program that allows the
user to setup parameters in Qualitrol Model 111 and Model 118 series electronic
temperature monitors via the RS232 port of the ETM. There is some variation in
what parameters can be set in each model. The software only shows parameters
available to the model being configured.
The software allows configuration values to be entered into a setup screen and
then sent to the ETM and/or saved to a configuration file for future use. Operation
of the software consists of these menu selections.
Installation
Run SETUP.BAT on the installation CD. This will create a directory
C:\QualiTROL on the hard drive, and will install the program and default
configuration files in that directory. It will also put an icon on the desktop to start
the program.
Files
When the program first starts, you must either select an existing configuration file
or start a new configuration file. Until a file is assigned or selected the other menu
items are not available.
NEW –Use the NEW button or use File / New Config File to start a new
configuration. The program will ask what Model you are going to configure and
then will use the standard Windows screen to allow you to assign a file name to
the configuration file.
OPEN –Use the OPEN button or use File / Open Existing Config File to
select an existing configuration file. The configuration file contains the type ETM
being configured. If the default file is chosen, the values can be changed and
stored as the new default values, or they can be stored as a different configuration
name.
Select Comm Port –Selects the computer Comm Port to use to talk to the ETM
Exit-Exits the program
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Configuration
View / Change Config –Opens a screen that allows the entry of
configuration information. One can then download the configuration to an ETM
and / or save it to a configuration file. It is also possible to upload the existing
configuration from the ETM to the Configuration screen
The configuration Software allows the user to set up the following parameters of
the ETM:
•Active Channels –Any one or 2 of the 3 input channels can be turned off, if
they are not being used in an application.
•Fan / Alarm / Trip setpoint and switching differential (hyteteresis) can be set
to determine at what temperature the relays turn on and off.
•Trip relay can be set to failsafe (normally energized) or not failsafe (normally
de-energized).
•Fan Exerciser –the fan exerciser function can be turned ON or OFF. When it
is ON, the time between turning the fans on, and the run time can be set.
•SCADA Remote Output can be set to operate from hottest phase or only
center phase.
•Reverse thermocouple sense feature can be activated or de-activated. This
allows an inadvertent sensor-wiring problem to be detected quickly. If the
thermocouple is connected incorrectly, as the temperature goes up, the display
temperature goes down. If the reverse thermocouple feature is activated, when
the thermocouple reaches 30°C below the (internal) ambient temperature chip,
the unit will go into “fault” mode. In some instances a sudden increase in
ambient, such as early morning sun shining on a unit where the transformer is
still cold may cause the same result. In this case the reverse thermocouple
feature can be de-activated, and the unit will require a 70°C difference
between the thermocouple and ambient to go into “fault” mode.
•The communications parameters for the optional RS-485 output can be set.
•Send configuration data to ETM –This will cause the displayed configuration
data to be written to the ETM. After the data is changed in the ETM memory,
the ETM will reset to activate the new values.
•Get configuration data from ETM –This reads the configuration currently in
the ETM and displays that data on the screen.
•Save –This will save the current configuration to the current open file (if it is
the default file, it will overwrite it).
•Save as –Allows the current configuration to be saved to a new file name or
different path.
•Done –exits this window.
Print Configuration -Prints the configuration screen.
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ORDER CONFIGURATION
This Unit is configured as follows:
118 -___ -_K_ -___-___-___
Communications
M–Modbus communications present
Fan Relay
1-Single fan relay and fuse
2-Dual fan relays and dual fuses
Remote Output
0 -0-1mA loop
4-4-20mA loop
Thermocouple
K-Type K
Voltage
120 -120VAC
240 -230/240VAC
277 -277VAC
Package
P-Panel mounting plate
H -Box with hinged front cover
FAN turns ON at ___________°C and OFF at ____________ °C
ALARM turns ON at ___________ °C and OFF at ____________ °C
TRIP turns ON at ___________ °C and OFF at ____________ °C
FAN EXERCISER -ON FOR ________ Min. EVERY __________ Days
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APPENDIX A–Manual Setpoint Adjustment
Although the preferred method of changing the unit setup is to use a computer
connected to the RS-232 port, there may be cases where it is desired to change a
setpoint in the field when there is no computer available. The model 118 has this
capability by using the following procedure:
•Push and hold the MAX MEMORY RESET button for 5 seconds. The unit
will stop scrolling, the FAN light will be on and the display will show the Fan
setpoint. (This will also reset the Max Memory)
•Use the AUDIBLE and MAX MEMORY buttons to step the Fan setpoint up
or down.
•Push the MANUAL FAN button. The ALARM light will be on and the
display will show the Alarm setpoint.
•Use the AUDIBLE and MAX MEMORY buttons to step the Alarm setpoint
up or down.
•Push the MANUAL FAN button. The TRIP light will be on and the display
will show the Trip setpoint.
•Use the AUDIBLE and MAX MEMORY buttons to step the Trip setpoint up
or down.
•Push the MANUAL FAN button. The display will indicate whether the
reverse thermocouple function is active (rS) or inactive (nrS). Use the
AUDIBLE or MAX MEMORY buttons to toggle between rS and nrS.
•Push the MANUAL FAN button. The new settings are saved and the unit
returns to normal operation.
If during the above process no button is pushed within 30 seconds, the unit returns
to normal operation.
When the setpoint is changed using the above technique the switching differential
is preserved. Thus, if the original fan setpoint were 190°C with a 10°C switching
differential, the fans would come on at 190°C and turn off at 180°C. If the above
method is used to change the setpoint to 175°C, then the fans will turn on at
175°C and off at 165°C.
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APPENDIX B–Thermocouple Accuracy
In order to assure accurate results when using thermocouple-based devices, certain
installation and testing procedures should be observed. This appendix addresses
the installation of the Model 118 Electronic Temperature Measuring device
(ETM) and techniques required to test its accuracy in a laboratory setting.
Installation Considerations
The temperature sensed by a thermocouple device is a function of the temperature
differential between the thermocouple (TC) and its point of connection to the
ETM. Thus sudden changes in the ambient temperature surrounding the ETM
can change the terminal block temperature faster than the internal ETM
temperature can stabilize. For this reason the point of connection needs to be
protected from moving air.
The most common method of installation for the ETM is to mount it in some type
of enclosure that will protect the unit from air currents such as those caused when
the fans turn ON. If the unit is installed in an enclosure, no further protection is
required.
If the unit is mounted without being installed in an enclosure, then to maintain the
rated accuracy some form of covering is needed over the TC connection terminals
to protect them from stray air currents.
Method for Testing ETM Accuracy
To test the accuracy of an ETM, a millivolt signal must be applied which is the
millivolt equivalent of the temperature between the terminal block and the TC.
Since the precise temperature of the terminal block is not known, a common
method is to use a TC immersed in an ice bath as a reference (0°C) and then
adding the millivolt equivalent of the degrees above zero C that are desired as the
input to the ETM.
The sketch below indicates one method of doing this. Note that again the
terminals on the ETM must be protected from air currents and the ETM must be
given time for the internal temperatures to stabilize before accuracy testing is
performed. The best way to do this testing is with the ETM mounted in the
enclosure that will be used in the final installation.
Test setup for applying simulated thermocouple readings to the ETM
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APPENDIX C–Error Codes
During normal operation the system is constantly checking itself for proper
operation. If a failure is detected, the fans are turned ON and the unit is put into
the alarm state. The unit will then operate as follows:
♦Failed Sensor
•Show “---“ on the display during the time when that sensor value would be
displayed
•Show which sensor is bad
•System continues to function using the remaining input channels
♦Failed A/D Converter
•Show “E11 on all channels
♦Failed Ambient Temperature Sensor
•Show “E22” on all channels
•Set ambient temperature at 30oC
•Continue to operate using 30oC ambient
♦Failed EEROM After Initial Start-up
•Show “E33” on all channels
•Continue to operate
♦Failed EEROM at Power-up
•Show “E33” on all channels
♦Failed Display Driver
•Continue to operate
♦Failed Microprocessor
•Unit will not operate but failure is detected. The FANS will turn ON and
ALARM relay will be in the alarm state.
♦Intermittent sensor connection
•If there is an intermittent sensor the alarm and fan relays will latch ON.
During the time the sensor is open the display will show “---“. During the
time the sensor is closed it will show b –C (bad connection). Once the
problem is resolved, push the SILENCE button to unlatch the alarm and fan
relays.
♦Reversed Thermocouple
•If a thermocouple is installed with the wires reversed, the temperature reading
will go down as the temperature of the thermocouple goes up. If the
thermocouple temperature is 30°C colder than the temperature inside the unit,
the unit will operate the alarm and the fan relay contacts, and the display will
show ---.
•There may be cases where this feature will cause a false alarm. The reversed
thermocouple detection can be turned off as described in Appendix A.
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APPENDIX D–Using the Model 118 in the European Community
Installation
The Model 118 is intended to mount in the customer’s panel, enclosure or be
otherwise protected so that only the face of the instrument is accessible to the
operator. There are potentially hazardous voltages (mains) on the rear terminals
of the unit.
The mains supply power to both the Model 118 and the cooling fans for the
customer’s transformer. The wire size required for mains wiring is dependent on
the fan current and must be determined by the customer.
The user must supply appropriate anchorage for the mains wiring.
The Model 118 is designed to be installed in Installation category III per EN
61010-1 (low voltage directive).
A terminal connected to the Model 118 chassis is provided as TB1-11. This
provides the means to connect the Model 118 front panel to the grounding system
of the cabinet or enclosure.
To meet the requirements of the EN 61010-1 paragraph 6.12.2.1:
•A switch or circuit breaker must be provided to control power to the unit.
•It shall be in close proximity to the unit and within easy reach of the operator.
•It shall be marked as the disconnecting device for the equipment.
Radio Frequency interference above Level 1 of EN 61000-4-6 conducted on the
Mains wiring may affect the reading of the Model 118. This is a very unlikely
type of interference in the usual environment of the Model 118. In the event that
this type of interference is present, an RF filter will need to be applied to the
Mains wiring external to the Model 118.
The Model 118 is immune to radiated Radio Frequency interference such as that
caused by hand held radio transmitters or cellular telephones.
Fuses
There are 2 types of fuses used in the unit.
20A fuse 0.25 inch x 1.25 inch Type F
1A fuse 0.25 inch x 1.25 inch Type F
The 20A fuse monitors the Fan Current. If this fuse fully opens, properly trained
maintenance personnel must determine the cause of the problem and with the
power turned OFF to the Model 118, change the fuse. This fuse is on the rear of
the unit and is only accessible by the use of a tool to gain access to the rear of the
unit.
The 1A fuse monitors the current going into the Model 118 electronic section. It is
located above the FAN#1 terminal block. If the 1A fuse opens, it should only be
replaced by a fuse of the same type and rating; Amp AGC-1.
Courtesy of NationalSwitchgear.com
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