CONTROLLER - Chromalox

CONTROLLER - Chromalox
http://www.chromalox.com
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LIMIT
PDS LIMIT
CONTROLLER
www.chromalox.com
615-793-3900
LIMIT-10100
Limit Control
Temperature
Limit Control
• Protects Processes
and Equipment From
Excessive Temperatures
• DIN Rail and Sub-Panel
Mounting
• J, K, E Thermocouple
or RTD Input
• Terminals Provided for
Remote Pushbutton
Reset
• Latching, Normally
Energized, 3 Amp
Relay Output
Description
The LIMIT protects expensive heaters and sensitive materials from
damaging over temperature conditions. It is designed for industrial and
commercial applications that require
high temperature protection.
The LIMIT features a Form C latching, manually resettable relay output
that de-energizes whenever the
sensed temperature exceeds the set
point temperature.
Two methods are provided to reset
an alarm condition. (1) The Limit
alarm has a reset pushbutton on
the unit and (2) reset terminals are
provided for resetting the alarm from
a remote pushbutton.
Specifications
Power Input: 120VAC or 24VAC
±15%, 50/60Hz, 3VA max. standard
Control Output: SPDT Relay rated
3.8 Amps Res. and 1.5 Amps Pilot
Duty 120 VAC. 100,000 cycles.
Control Mode: Latching with Manual
Reset or power off.
Reset Function: Integral reset switch
standard; terminals available for
optional remote reset switch.
Set Point Adjustment: Local SP dial
adjustment.
Control Stability: Typically less
than ±5µV/°F ambient and 0.1% of
SPAN/% rated line voltage.
Set Point Accuracy: ±3% of FS
maximum at 25°C and rated line
voltage.
Sensor Break Protection: Contacts
4 and 5 open for thermocouple or
RTD break.
Ambient Operating Temperature:
0 - 60°C (32 - 140°F).
Compensation (TC only): Automatic
cold junction compensation.
Noise Rejection:
Common Mode Rejection
Series Mode Rejection
Sensor Inputs
Mechanical
Sensor
J T/C
E T/C
K T/C
RTD
PH: 1-888-996-9258 • FX: 615-793-3563
The DIN Rail mounting feature allows
quick installation without drilling or
extra hardware. Slots are also provided for direct panel mounting.
Range
0-1400°F
0-750°C
0-1500°F
0-2300°F
0-850°F
(2 wire input)
www.chromalox.com
60dB
120dB
Enclosure Material: Noryl, Black
color.
Field Terminations: Screw Terminals with wire clamping plates and
touch safe shield.
Mounting:
35mm DIN rail or surface mounting.
©
2004 Chromalox, Inc.
LIMIT - Temperature Limit Control
Dimensions
3-5/16"
(84mm)
2-1/2"
(63.5mm)
3/8"
(9.5mm)
200
350
Limit Controller
150
300
°F
2-9/16"
(65mm)
RESET
1
2
3
4
5
6
+
AC L1
+
DC
N.C.
COM
N.O.
L2
–
Relay
Output
Power
Input
2-1/2"
(63.5mm)
7
8
3"
(76.2mm)
9
–
TC or
RTD
Sensor
Integral Reset
Button
N.O.Remote
Reset Switch*
Panel mounting foot
with clearance holes
for #6 screw
(2 places)
*Each LIMIT requires it’s own
contact input for reset. A single
contact input cannot be used to
reset multiple LIMITS.
Set point
adjust
35mm
DIN rail
mounting clips
Mounting
The LIMIT can be surface mounted or DIN rail mounted. It can be mounted to any suitable flat surface using two
#6 screws (not supplied). To install simply position the top set of rear clips over the top of the DIN rail. Then swing
the bottom of the controller toward the rail applying pressure until the lower clips snap on to the bottom of the
DIN rail. To remove apply pressure to the top of the controller’s base and move the bottom of the controller toward
you. Then lift the top of the controller off the upper DIN rail. The housing rating is NEMA 1.
Caution
This controller must be mounted in an enclosure suitable for protection against normally expected operation environments and to minimize unauthorized tampering with the limit settings.
2
Chromalox
®
•1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-888-996-9258 • FX: 615-793-3563 • www.chromalox.com
LIMIT - Temperature Limit Control
Typical Wiring Diagram
200
Primary
Temperature
Control
150
300
°F
NC
NO
C
+ –
NO
NC
120VAC
350
ETR-3
LIMIT
Limit
1
2
3
4
5
6
7
8
9
C
H
Control
Fuse
5A
Optional N.O.
Remote Reset
Switch
T/C
or
RTD
T/C or RTD
120V
Control
Power
N
Coil
Optional Alarm
or Warning
Lamp
Coil
Heater Power
1 or 3 Phase
Heater(s)
Heater
Fuses
Primary
Control
Contactor
Limit
Contactor
Wiring
Carefully follow the terminal diagram pictured
on the controller’s housing and shown above.
The power and load wiring should be 18 AWG
or larger size. Be sure to observe that the ratings for voltage and current are not exceeded.
All local and national electrical codes must be
followed.
Use only the sensor type as indicated on the
control and maintain correct polarity. THE
RED THERMOCOUPLE LEAD ALWAYS CONNECTS TO THE NEGATIVE (–) TERMINAL. To
reduce electrical noise, the thermocouple wire
must be isolated from any power or heater
wiring. Shielded thermocouple wire may be
necessary in high noise environments or when
lead lengths exceed 10 feet. Thermocouples
are tip sensitive and must be in good mechanical contact with the load.
The remote reset terminals allow for a remote
pushbutton (on the panel door) to reset the
LIMIT alarm. If multiple units are mounted in
a panel, the remote reset terminals cannot
be wired in parallel. The remote pushbutton needs a separate contact block for each
LIMIT. A single contact input cannot be used
to reset multiple LIMITs.
▲
! WARNING
ELECTRIC SHOCK HAZARD. Any installation involving controls must be performed by a
qualified person and must be effectively grounded
in accordance with the National Electrical Code
to eliminate shock hazard.
Chromalox
®
•1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-888-996-9258 • FX: 615-793-3563 • www.chromalox.com
3
LIMIT - Temperature Limit Control
Operation
Trouble Shooting
The set point temperature is adjustable by turning the
integral dial. If the set point is exceeded, contacts 4
and 5 will open. It will remain in this state until the temperature drops below the set point and the controller is
manually reset. Manual reset can be accomplished by
one of the following means: a) Press the “reset button”.
b) A momentary switch closure between terminals 8
and 9. c) Interrupt power to the control.
Experience has proven that many control problems
are not caused by a defective instrument. Some of the
common causes of failure are broken sensors, open
fuses and poor wire connections. If these points have
been checked and the control still does not function, it
is suggested that the instrument be returned for inspection. Use adequate packing materials to prevent damage in shipment.
Maintenance
No specific maintenance is required. However, it is
recommended that all wiring be checked periodically
for loose connections and damaged wires. Disconnect
power to the panel before any maintenance is performed. Check wires and tighten connections.
Custom Controllers
Custom temperature ranges and fixed set point units
are available to meet your specific application needs.
Ordering Information
Model
LIMIT-10100
LIMIT-10200
LIMIT-10350
LIMIT-10400
LIMIT-10500
LIMIT-10101
PCN
305699
305701
305998
305710
305728
305736
Temperature
Range
0-1400°F
0-2300°F
0-1500°F
0-850°F
0-750°C
0-1400°F
Input
Type
J T/C
K T/C
E T/C
RTD
J T/C
J T/C
Input
Power
120 Vac
120 Vac
120 Vac
120 Vac
120 Vac
24 Vac
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
PK304-4
PDSLIMIT
DECEMBER 2010
4
Chromalox
®
•1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 1-888-996-9258 • FX: 615-793-3563 • www.chromalox.com
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