Watlow Series 146 - Manual (Page 2)

Figure 2a — Series 146 dimensions.
Sub-Panel Mounting the Series 146
NOTE: FM approval requires limit switches to be suitably enclosed
to minimize casual readjustment of set temperature.
1. Using the controller as a location template, mark both
mounting holes.
2. Drill two 5 mm (0.19 in.) diameter holes in the desired
panel location. See Figure 2a for hole locations.
3. Mount the Series 146 using two #8-32 screws.
DIN Rail Mounting the Series 146
1. Place the Series 146 upper mounting clip on the top edge
of the DIN rail. See Figure 2b on this page.
2. Press down firmly on the top front edge of the Series
146. The controller “snaps” securely onto the rail. If the
controller does not snap on, check to see if the DIN rail
is bent. Minimum clipping distance is 34.8 mm (1.37 in.),
the maximum is 35.3 mm (1.39 in.).
Removing the Series 146 from the DIN Rail
1. Place your fingers on the release lever located at the
base of the Series 146.
2. While gently pressing on the top of the case, above
Terminals 1-9, pull forward on the release lever.
Note, caution and warning symbols appear throughout this
book to draw your attention to important operational and
safety information.
A “NOTE” marks a short message to alert you to an impor-
tant detail.
A “CAUTION” safety alert appears with information that is
important for protecting your equipment and performance.
A “WARNING” safety alert appears with information that is
important for protecting you, others and equipment from
damage. Pay very close attention to all warnings that apply
to your application.
The ç symbol (an exclamation point in a triangle) precedes
a general CAUTION or WARNING statement.
The Ó symbol (a lightning bolt in a triangle) precedes an
electric shock hazard CAUTION or WARNING safety
statement.
Figure 2b — Series 146 side view mounting.
• Use the correct sensor type per the model number on the
unit sticker.
• Use the proper thermocouple or RTD polarity.
• Insulate the thermocouple mounting from the mounting
surface to prevent heat migration input errors.
• Thermocouple leads should be twisted pair wire and
routed separately from any other lines.
• In electrically noisy environments (heavy switching of
contactor, motors, solenoids, etc.) use shielded thermocou-
ple lead wire with the shield connected at the sensor end
only.
• All wiring and fusing must conform to the National
Electric Code (NEC) NFPA70 and any other locally applic-
able codes.
• Fuse the independent load voltage on the L1 (hot) side
and connect it to the common (COM) side of the relay.
ç
CAUTION: A power disconnect located near the controller is
recommended to shut down power in case of controller failure.
• Long lead lengths create electrical resistance. When using
a two wire RTD, there will be an additional error for
every 1
Ω of lead length resistance. That resistance when
added to the resistance of the RTD element, can result in
erroneous input to the temperature limit. To overcome
this problem, use a three wire RTD sensor, which compen-
sates for lead length resistance. When extension wire is
used for a three wire RTD, all three extension wires must
have the same electrical resistance. (i.e. same gauge,
copper stranded.
Wiring Guidelines
DIN Rail
Panel
Upper Mounting Clip
Lower Mounting Clip
Snap Action
Release Lever
Mounting
Safety Information
Installation
99 mm
(3.89 in.) 95 mm
(3.72 in.)
58 mm
(2.28 in.)
41 mm
(1.62 in.)
113 mm
(4.45 in.)
35 mm x 7.5 mm
Rail is not
included in
the assembly
104 mm
(4.10 in.)
96 mm
(3.75 in.)
Dimensions
2 ■ Watlow Series 146 User’s Manual