Red Lion LEGEND - Manual (Page 55)

ADDITIONAL EMC INSTALLATION GUIDELINES (Cont’d)
4. In extremely high EMI environments, the use of external EMI suppression
devices, such as ferrite suppression cores, is effective. Install them on
Signal and Control cables as close to the unit as possible. Loop the cable
through the core several times or use multiple cores on each cable for
additional protection. Install line filters on the power input cable to the unit
to suppress power line interference. Install them near the power entry point
of the enclosure. The following EMI suppression devices (or equivalent)
are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC #FCOR0000)
TDK # ZCAT3035-1330A
Steward #28B2029-0A0
Line Filters for input power cables:
Schaffner # FN610-1/07 (RLC #LFIL0000)
Schaffner # FN670-1.8/07
Corcom #1VB3
Corcom #1VR3
Note: Reference manufacturer’s instructions when installing a line filter.
5. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
6. Switching of inductive loads produces high EMI. Use of snubbers across
inductive loads suppresses EMI.
Snubbers:
RLC #SNUB0000
WIRING CONNECTIONS
The bottom board has a removable terminal block (TBA) where the solid
state outputs and the power connections are made. The top board has a
removable terminal block (TBB) where the signal inputs, User Inputs, and
serial communications connections are made. When wiring the unit, remove
the terminal block and use the numbers on the top label to identify the position
number with the proper function. All conductors should meet voltage and
current ratings for each terminal. Also cabling should conform to appropriate
s t a n d a r d s o f g o o d i n s t a l l a t i o n , l o c a l c o d e s a n d r e g u l a t i o n s . I t i s
recommended that power supplied to the unit (AC or DC) be protected by a
fuse or circuit breaker. Strip the wire, leaving approximately ¼" bare wire
exposed (stranded wires should be tinned with solder). Insert the wire into the
terminal and tighten down the screw until the wire is clamped in tightly. Each
terminal can accept up to two 18-gage wires. After the terminal block is
wired, install it in the proper location at the rear of the unit. Wire each
terminal block in this manner.
USER INPUT WIRING
Programmable external user inputs are digital inputs that are active when
connected to TBC #3 Common. The use of shielded cable is recommended.
Follow the Additional EMC Installation Guidelines for shield connection.
A.C. POWER WIRING
The AC power is connected to the bottom left terminals TBA 1 & 2 marked AC
PWR. The voltage selector switch, located at the side of the unit, is used to select
the proper voltage. The switch is a slide movement type and can be set by using a
small screwdriver. If the switch is toward the front of the unit, it is set for 115
VAC input. If the switch is towards the rear of the unit, it is set for 230 VAC
input. The switch is in the 230 VAC position when shipped from the factory.
Note: Before applying power to the unit make sure the A.C. power switch is set
for the proper voltage setting.
To reduce the chance of noise spikes entering the AC line and affecting the
unit, the AC power should be relatively “clean” and within the specified
±10% variation limit. Connecting power from heavily loaded circuits or
circuits that also power loads that cycle on and off, (contactors, relays,
motors, etc.) should be avoided.
DC POWER WIRING
The DC power is connected to the bottom left terminals TBA 3 & 4 marked
+12 VDC and common. The DC power source must be capable of supplying
the unit’s rated current (250 mA) and be within the specified
±20% variation
limit. It is not necessary to provide battery backup to retain programmable
information. The Legend Plus has non-volatile memory and information is
stored on power down (Refer to block diagram).
SERIAL COMMUNICATIONS
Refer to the Serial Communications section of the manual, for wiring and
operational procedures.
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