Minco CT124 Manuel utilisateur
MINCO CT124
8-Channel Temperature Monitor
INSTRUCTION MANUAL
When quality and performance are as important as price, call...
PRODUCTS, INC.
7300 Commerce Lane/Minneapolis, Minnesota 55432-3177 U.S.A.
Telephone:(763)571-3121 FAX:(763)571-0927
FORM#930616-1
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CONTENTS
SAFETY ........................................ 2
GENERAL DESCRIPTION ........................... 3
INSTALLATION .................................. 4
MOUNTING ................................ 4
WIRING ................................... 5
CHANGING FRONT PANEL LABELS ............. 9
OPERATING INSTRUCTIONS ........................ 10
PROGRAMMING INSTRUCTIONS ..................... 12
TROUBLESHOOTING .............................. 18
ERROR MESSAGES .......................... 18
CALIBRATION .............................. 20
RETURN FOR REPAIR ........................ 21
SPARE PARTS LIST .......................... 21
SPECIFICATIONS ................................. 22
MODEL NUMBER CODING .......................... 23
Minco Products, Inc. CT124 Instruction Manual
1
SAFETY
1. Dangerous high voltages are present inside the case. Always cut
power to the controller before opening the front cover.
Installation of a nearby power cutoff switch is recommended.
2. Contact Minco before attempting any repairs.
3. Do not remove the CT124’s rear cover. Access the inside by
removing the front cover only.
4. Many components may be damaged by static discharge. Do not
touch electrical connections inside the case. Handle plug in cards
only by their edges or at a static-free workstation.
5. Never unplug the ribbon cable inside the enclosure while power
is applied. Permanent damage may result.
Minco Products, Inc. CT124 Instruction Manual
2
GENERAL
GENERAL DESCRIPTION
The CT124 8-Channel Temperature Monitor offers flexible protection and control of temperature-critical
equipment and processes. It scans up to eight RTD’s and activates four relays plus a built-in audible
alarm.
In a typical application, the CT124 provides early warning of possible large machine failure by monitoring
the temperature of bearings, stators, transformer coils, and oil outlets. You can configure the CT124 to
many other situations such as on/off control or under-temperature alarms. The CT124 can even monitor
and control several loops at one time since you can group input zones with output relays in any
combination.
Features:
•Protect motors, generators, transformers, and other equipment.
•Monitor 1 to 8 resistance temperature detectors (RTD’s).
•4 internal relays and audible alarm with independent trip points.
•Over-temperature or under-temperature protection.
•Microprocessor based; fully programmable.
•Large, bright LED display shows °F or °C.
•Stores high and low temperature peaks.
•Trip points, programs, and peaks stored in non-volatile memory.
•Programmable silence button.
•Versatile override switch permits manual relay toggling.
•Rugged enclosure with sealed front panel.
Minco Products, Inc. CT124 Instruction Manual
3
INSTALLATION
INSTALLATION INSTRUCTIONS
MOUNTING
1. Choose a mounting location which meets these conditions:
•Operating ambient temperatures must be within 0 to 55°C (32 to 131°F).
•Air must be free to circulate around the sides and rear of the case.
•The front panel is sealed against dust and moisture. The sides and rear must be protected
from water and excessive dust inside a suitable enclosure.
•Do not use the CT124 in hazardous (explosive) atmospheres.
•Do not expose the CT124 to continuous or excessive shock and vibration.
•Mount the CT124 at any angle.
2. Cut a rectangular hole in your panel according to the dimensions shown in Figure 1.
Figure 1 Panel Cutout Dimensions (in inches)
3. Place the controller into the panel hole. Using a Phillips screwdriver with a shaft diameter less
than ¼" (6.3 mm), tighten the four clamping screws shown in Figure 2.
Figure 2 Clamping Screw Access Locations
Minco Products, Inc. CT124 Instruction Manual
4
INSTALLATION
WIRING
Carefully read the following wiring instructions before routing the power and signal (RTD) wires to the
CT124. You must observe these guidelines in order to ensure safe, accurate, and stable operation.
No special terminals are required; just strip all wires 1/4". Maximum wire size is 14 AWG.
You may find it more convenient to unscrew the two connector boards from the rear of the case and
remove them while you are connecting the wires. In the event that the CT124 must be returned to Minco
for repair, simply disconnect the connector boards and leave the wires attached to the terminal blocks.
Power Supply Wiring
115/230 Volt Version (Standard):
The controller is factory set for 115 VAC operation. A switch inside the case cover selects optional 230
VAC. After reading the precautions on page 2, remove the front cover. Set the switch on the right most
circuit board to 230 VAC (see Figure 3). Replace the cover.
Installation of an external power switch or circuit breaker is strongly recommended for safety and
serviceability. To replace internal fuses the power must be turned off. Also, dangerous voltages are
within easy reach if the front panel is removed while power is on.
The CT124 is internally fused with two .315 amp fast-blow fuses (5 x 20 mm). External fusing is not
necessary. The fuses are located on the power supply board (rightmost circuit board). The board must
be removed to replace the fuses.
Connect power to the Line Input terminals of the power line filter on the back of the CT124. See
Figure 4 for details. Use the 1/4" quick connect terminals provided.
Figure 3 Switch Location for
115/230 VAC Operation Figure 4 AC Power Wiring Diagram
24 Volt DC Version:
As shown in Figure 5, connect the 24 volt positive lead to terminal 1 of the power terminal block, the
negative lead to terminal 2, and chassis ground to terminal 3.
Minco Products, Inc. CT124 Instruction Manual
5
INSTALLATION
An external power cut-off switch is not needed for safety, but would be useful if servicing inside is needed
at a later date.
The 24 VDC version is internally fused with a single .315 amp fast-blow fuse (5 x 20 mm). External
fusing is not necessary.
Figure 5 Relay Wiring Diagram
Relay Wiring
The relay connector board is labelled with normally open and normally closed contact symbols. This
corresponds to the unpowered or "normal" acting operating state of the relays.
In certain applications you may want the relays to be "reverse" acting. This means that if the CT124 loses
power, the relay(s) will de-energize into the tripped or alarm state. See Figure 6 for a summary of relay
states.
You can set any of the 4 relays for reverse action with dip switch S1 located on the top of the power
Figure 6 Relay States
Relay Actions Terminal Positions
1-2 2-3
NORMAL ACTING
Power on - untripped Closed Open
Power on - tripped Open Closed
Power off Closed Open
REVERSE ACTING
Power on - untripped Open Closed
Power on - tripped Closed Open
Power off Closed Open
supply (right-most) board inside the case (Figure 7). Read the safety precautions on page 2 before
removing the cover.
Minco Products, Inc. CT124 Instruction Manual
6
INSTALLATION
Figure 7 Dip Switch Location
RTD Wiring
Avoid routing RTD wires along with or near electrically noisy wires such as wiring to contactors, motors,
computers, etc. Electrical interference from these wires may cause instability or shifts in the CT124’s
readings. For best noise immunity, use twisted and shielded extension leadwire to the RTD’s.
The RTD wires and sensing element must be insulated from ground potential and all other voltages. Be
sure the dielectric strength rating of the RTD exceeds the voltage it will see in use, especially when
mounted in electric machinery.
Figure 8 shows RTD wiring. For 3-lead RTD’s, connect the 2 leads of the same color to TB2 and TB3,
the odd lead to TB1. Connect 2-lead RTD’s to TB1 and TB2 with a shorting jumper wire from TB2 to
TB3. Connect shields to TB4.
Secure all wires to the connector boards with nylon cable ties in the holes provided.
Figure 8 RTD Wiring Diagram
Minco Products, Inc. CT124 Instruction Manual
7
INSTALLATION
The CT124 will automatically cancel the effects of long lead wires with up to 10 ohms of leadwire
resistance when used with 3-lead RTD’s. Knowing the size and length of the RTD’s leads, we can
estimate the resistance. Figure 9 lists the size of wires, their resistance per foot at 25°C, and the
maximum length each leadwire can be for 10 ohms of resistance. For proper leadwire cancellation, each
lead must have exactly the same resistance. For example, a difference of 1 ohm can mean more than
2.5°C (4.6°F) error for a 100 Ωplatinum RTD, or more than 26°C (47°F) error for a 10 Ωcopper RTD.
Figure 9 Leadwire Resistance Chart
Leadwire
(AWG) Ohms/Foot
at 25°C Maximum Length
for 10 Ohms of Resistance
18 0.0065 Ω/ft. 1538 ft.
20 0.0103 Ω/ft. 971 ft.
22 0.0165 Ω/ft. 606 ft.
24 0.0262 Ω/ft. 382 ft.
26 0.0418 Ω/ft. 239 ft.
28 0.0666 Ω/ft. 150 ft.
Alternative RTD Wiring Options
For the best accuracy, all 3 leads of each RTD should be brought to the CT124 as shown in Figure 8.
However, with some high voltage electric motors, the RTD’s have been prewired to a terminal block with
one of the common leads for each RTD grounded. Unless required for safety reasons, this should be
rewired with 3 individual leads for each RTD to the CT124.
Figure 10 shows 2 alternative wiring methods. With either method, ground loop currents may cause
erratic readings. If so, remove the ground connection to the CT124’s power input terminal block. Note
that option B does not provide 3-lead compensation.
OPTION A OPTION B
Figure 10 Alternative RTD Wiring Options
Minco Products, Inc. CT124 Instruction Manual
8
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