Red Lion TLA - Manual (Page 3)

3
OUTPUT SPECIFICATIONS
1. LIMIT AND ALARM OUTPUT RELAYS:
Contact Rating: 5 A @ 250 VAC or 30 VDC (resistive load).
Life Expectancy: 100,000 cycles at max. load rating. (Decreasing load
increases life expectancy.)
2. LIMIT OUTPUT: TLA21000: Form-C relay; TLA11100: Form-A relay.
Selectable for high or low trip activation. If the process temperature goes
above the limit setpoint for a high trip, or below the limit setpoint for a low
trip, the limit relay will de-energize to initiate a process shutdown. The limit
output cannot be reset until the process temperature returns to the proper
operating range; manual reset is required (local or remote).
Annunciators:
“EX” - Lit when the process temperature exceeds the limit setpoint.
“OUT” - Lit when the limit output is de-energized.
3. ALARM OUTPUTS (Optional): One or two Form-A relays.
Modes:
Absolute High Acting Absolute Low Acting
Deviation High Acting Deviation Low Acting
Inside Band Acting Outside Band Acting
Reset Action: Programmable; automatic or latched. Latched alarms can be
reset regardless of limit exceed condition.
Standby Mode: Programmable; enable or disable.
Hysteresis: Programmable.
Annunciator: “A1” and “A2” programmable for normal or reverse acting.
Although Red Lion Controls Products are designed with a high degree of
immunity to Electromagnetic Interference (EMI), proper installation and wiring
methods must be followed to ensure compatibility in each application. The type
of the electrical noise, source or coupling method into a unit may be different
for various installations. Cable length, routing, and shield termination are very
important and can mean the difference between a successful or troublesome
installation. Listed are some EMI guidelines for a successful installation in an
industrial environment.
1. A unit should be mounted in a metal enclosure, which is properly connected
to protective earth.
2. Use shielded cables for all Signal and Control inputs. The shield connection
should be made as short as possible. The connection point for the shield
depends somewhat upon the application. Listed below are the recommended
methods of connecting the shield, in order of their effectiveness.
a. Connect the shield to earth ground (protective earth) at one end where the
unit is mounted.
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is over 1 MHz.
3. Never run Signal or Control cables in the same conduit or raceway with AC
power lines, conductors, feeding motors, solenoids, SCR controls, and
heaters, etc. The cables should be run through metal conduit that is properly
grounded. This is especially useful in applications where cable runs are long
and portable two-way radios are used in close proximity or if the installation
is near a commercial radio transmitter. Also, Signal or Control cables within
an enclosure should be routed as far away as possible from contactors,
control relays, transformers, and other noisy components.
4. Long cable runs are more susceptible to EMI pickup than short cable runs.
5. In extremely high EMI environments, the use of external EMI suppression
devices such as Ferrite Suppression Cores for signal and control cables is
effective. The following EMI suppression devices (or equivalent) are
recommended:
Fair-Rite part number 0443167251 (RLC part number FCOR0000)
Line Filters for input power cables:
Schaffner # FN2010-1/07 (Red Lion Controls # LFIL0000)
6. To protect relay contacts that control inductive loads and to minimize radiated
and conducted noise (EMI), some type of contact protection network is
normally installed across the load, the contacts or both. The most effective
location is across the load.
a. Using a snubber, which is a resistor-capacitor (RC) network or metal oxide
varistor (MOV) across an AC inductive load is very effective at reducing
EMI and increasing relay contact life.
b. If a DC inductive load (such as a DC relay coil) is controlled by a transistor
switch, care must be taken not to exceed the breakdown voltage of the
transistor when the load is switched. One of the most effective ways is to
place a diode across the inductive load. Most RLC products with solid
state outputs have internal zener diode protection. However external diode
protection at the load is always a good design practice to limit EMI.
Although the use of a snubber or varistor could be used.
RLC part numbers: Snubber: SNUB0000
Varistor: ILS11500 or ILS23000
7. Care should be taken when connecting input and output devices to the
instrument. When a separate input and output common is provided, they
should not be mixed. Therefore a sensor common should NOT be connected
to an output common. This would cause EMI on the sensitive input common,
which could affect the instrument’s operation.
Visit RLC’s web site at http://www.redlion.net/Support/InstallationConsiderations.
html for more information on EMI guidelines, Safety and CE issues as they
relate to Red Lion Controls products.
EMC INSTALLATION GUIDELINES
RBD48111
RBDLA210
REPLACEMENT
OUTPUT BOARD
TLA11100 Form-A Relay Form-A Relay Form-A Relay
TLA21000 Form-A Relay Form-C Relay
PART NUMBERS ALARM 2 OUTPUT ALARM 1 OUTPUT LIMIT OUTPUT
18 to 36 VDC / 24 VAC
85 to 250 VAC
RBD48111
RBDLA210
REPLACEMENT
OUTPUT BOARD
TLA11110 Form-A Relay Form-A Relay Form-A Relay
TLA21010 Form-A Relay Form-C Relay
PART NUMBERS ALARM 2 OUTPUT ALARM 1 OUTPUT LIMIT OUTPUT
ORDERING INFORMATION