instructions
for INSTALLATION OPERATION and MAINTENANCE
POWERSTAT
®
VARIABLE TRANSFORMERS
WITH POWERKOTE
®
COILS
136B-236B Series
The right to make engineering re
fi
nements on
all products is reserved. Dimensions and other
details are subject to change.
Printed in USA
ECN 95830
INSPECTION
A POWERSTAT Variable Transformer is a precision product packed with care.
When unpacking, examine carefully for any shipping damage. Inspect the brush
contact with particular care. The “Damage and Shortage” Instructions packed
with the unit outline the proper procedure to follow if any parts are damaged
or missing.
INSTALLATION
NOTE- The unit should be protected from any dust or debris that may be
encountered while drilling holes, installing wiring, etc., during installation.
MANUALLY OPERATED ASSEMBLIES
POWERSTAT Variable Transformer types 136B and 236B have three sets of
mounting holes to facilitate installation in new or existing layouts. Use the set
that is most convenient for the application. All models are designed so that
the same unit can be either bench or back-of-panel mounted as desired. The
units as shipped are arranged for bench mounting. To change to back-of-panel
mounting, proceed as outlined.
SINGLE UNITS
The 3PN model, having a cord and plug input and a receptacle output, is usually
used as a portable source of variable a-c voltage. If desired it may be mounted
in the same manner as other manually operated single units.
BENCH OR WALL MOUNTING
1. Locate and drill the desired set of mounting holes (four holes “A”, three
holes “B” or three holes “C”) using Drilling Template No. 1. When mounting
holes “B” or “C” are used, it is necessary to have access to the rear of the
mounting surface.
2. Place the unit in position. Insert and tighten the mounting bolts. For
mounting holes “B” or “C”, the length of the mounting bolts must not exceed
the thickness of the mounting surface plus ½”.
BACK-OF-PANEL MOUNTING
1. Locate and drill the desired set of mounting bolt holes (four holes “A”,
three holes “B” or three holes “C”), the dial screw holes “D” and the center
shaft hole using Drilling Template No. 2. Maximum panel thickness is 3
inches. The three dial screw holes must be tapped to accommodate the
6-32 screws supplied.
2. Loosen the knob setscrews and remove the knob. Remove the dial and
mount it to the panel with the three 6-32 screws.
3. Loosen the shaft setscrews (at the base end of the shaft) and slide the shaft
through so it will project about 1-1/16” through the panel after installation.
Tighten the setscrews.
4. Place the unit in position, insert and tighten the mounting bolts. Be sure
that the mounting bolt length does not exceed the panel thickness plus ½”
when using holes “B” or “C”. Place the knob on the shaft and position the
pointer correctly with respect to the brush position and the dial indications.
Tighten the knob setscrews.
GANGED ASSEMBLIES
BENCH OR WALL MOUNTING
A. On
Standoffs
1. Locate and drill the mounting bolt holes (four holes “A”) using Drilling
Template No. 1.
2. Place the unit in position. Insert and tighten the mounting bolts. When
access to the rear of the mounting panel is not possible, the unit may be
mounted to an adapter plate and the adapter plate mounted to the panel
using lag screws.
B. On Side Brackets
1. Locate and drill the four mounting bolt holes using Drilling Template
No. 3. BE SURE TO USE THE PROPER SET OF HOLES.
2. Insert and screw in part way the two top mounting bolts.
3. Place the unit in position and insert the two bottom bolts. Tighten all
bolts.
BACK-OF-PANEL MOUNTING
1. Locate and drill the four mounting bolt holes “A”, the three dial screw holes
“D” and the center shaft hole using Drilling Template No. 2. Maximum panel
thickness is 3”. The three dial screw holes must be tapped to accommodate
the 6-32 screws supplied.
2. Remove the knob and the dial. Loosen the shaft setscrews (at the base
end of each unit) and slide the shaft through so it will project about 1-1/16”
through the panel after installation. Turn the radiators of the units to the
extreme counterclockwise position and tighten the shaft setscrews.
3. Mount the dial to the panel with the 6-32 screws supplied.
4. Place the unit in position. Insert and tighten four 3/8-24 mounting bolts.
Mounting bolts are supplied with the unit for use with panels to ¾” thick.
For thicker panels use 3/8-24 bolts ½” longer than the panel thickness. A
3-gang assembly, because of its added length and weight, requires extra
support in the form of a shelf or cradle.
5. Place the knob on the shaft and position the pointer correctly with respect
to the brush position and the dial indications. Tighten the setscrews.
MOTOR-DRIVEN ASSEMBLIES
Motor-driven POWERSTAT Variable Transformers of the 136B-236B Series,
both single units and ganged assemblies, may be bench or wall mounted in
the same manner as manually operated ganged assemblies.
PARALLELING CHOKES
If an application’s current requirement is greater then a single variable
transformer’s per phase rating, it is common practice to use a larger model. In
some cases this is not possible either because there is no larger model or the
physical requirements of the application do not allow it. For these applications,
parallel-connected units can be used. These parallel connections require
paralleling choke(s) in addition to the POWERSTAT Variable Transformer,
which may be mounted in any convenient position. Paralleling choke T5587 is
available for this connection and must be ordered separately.
MAINTENANCE
With ordinary care, a POWERSTAT Variable Transformer should require no
servicing except possible replacement of the brush assembly. The brush should
be inspected periodically and replaced if arcing takes place or if it is badly worn.
Because the brush must be of a special material, replace only with a Superior
Electric brush assembly listed below. The assembly is designed to assure perfect
contact of the brush to the commutator regardless of brush position and length of
time in use. Take care to avoid scraping, scratching or marring the commutator
surface. Follow these steps to install a new brush assembly:
1. Remove the plate block above the terminal panel.
2. Unfasten the brush assembly anchor screws, remove and discard the old
brush assembly.
3. Insert the new brush assembly in the radiator slot, replace the anchor
screws and tighten to the radiator. Be sure that the back end of the brush
strap is under the projections at the rear of the radiator brush slot.
4. Raise the brush and place a piece of sandpaper (grit #400 or
fi
ner) between
the commutator surface and the brush so that the smooth side is on the
commutator and the abrasive side is against the carbon brush.
5. While holding the sandpaper in place (
fl
at), rotate the radiator through
a short arc. Remove the sandpaper and blow out the excess carbon
particles.
CONNECTIONS AND RATINGS
Important connection notes. Please read carefully.
·
CONNECTIONS AND RATINGS given in these instructions are those most
commonly used. In addition, all ganged units may be connected so that
the units operate electrically independent on a common shaft. When this is
desired, connections and ratings for a single deck unit should be used.
·
For ambient temperatures between -20°C and +50°C use current ratings
given in the charts. Figure C shows the output current de-rating required
above 50°C.
·
Coil to terminal connections for all 136B and 236B Series units are shown
in Figures D, E, and F.
·
The connection diagrams are labeled “L” for Line Connections, “B” for Boost
Connections and “S” for Step-Up Connections.
·
The F236B Series POWERSTAT® Variable Transformers do not have
terminals 6 & 7 available and therefore do not have a Step-Up (“S”)
Connection. Terminal #3 is after the fuse on all F models.
·
For the Step-Up Connections, the Ratings Chart shows maximum output
current rating for output voltages up to 125% of the input voltage, and
maximum KVA at maximum output voltage. The output current must be
reduced according to the curve in Figure G for output voltages greater than
125% of input voltage. Maximum KVA may be calculated using the rating
curve in Figure G for voltages less than maximum.
·
Clockwise (CW) and counterclockwise (CCW) rotation connections shown in
the Ratings Chart and Connection Diagrams are for motor driven units and
manual units with the knob on the radiator end. For connections with the
knob on the base end, use the shown CCW connection for CW operation,
and shown CW connection for CCW operation.
·
Fuses are recommended on all units as shown (§) and are supplied on F
and 3PN models. Supplied fuses are 25 ampere on 136B types, and 10
ampere on 236B types.
·
COMMON shown in the connection diagrams is used as third leg in 3-phase
open delta, or neutral in single-phase 3-wire and 3-phase 4-wire wye
con
fi
gurations. COMMON is not used in single-phase 2-wire or 3-phase
3-wire wye con
fi
gurations. Jumper(s) provided in standard common position
should be moved or removed as required.
·
Motor drive wiring is shown in Figure H.
·
Cord-and-plug units (3PN type) are wired in the Boost (“B”) Connection
when shipped.
·
The 3PN136B load current rating decreases with increased output voltage
due to the input plug rating. See Figure I for 3PN136B-load current rating.
·
For connections #9 and #10, a paralleling choke is required in addition to
the POWERSTAT® Variable Transformer. For connections #11 and #12,
two paralleling chokes are required. Paralleling choke T5587 is available for
this connection and must be ordered separately. Wire per the appropriate
diagram.
ECN 96882
002105-006 REV H ©2013
MOTOR DRIVE WIRING
FIGURE H
LOWER
UPPER
LOWER
RAISE
INPUT 120 V.
50/60 Hz
RESISITOR
DRIVE MOTOR
CAPACITOR
LIMIT SWITCH
C
NC
NO
LIMIT SWITCH
C
NC
NO
1
2
3
FIGURE B
BRUSH ASSEMBLY
Whenever unusual mechanical or electrical dif
fi
culties are encountered
in the operation or installation of your POWERSTAT Variable
Transformer, consult Superior Electric.
FIG. A
T5587 CHOKE
OUTLINE
NOTE: H1, H2, H3, and H4
are 1/4” Studs x 1” long.
TEMPLATE NO. 3
NOTE:
All dimensions are in inches [millimeters]
7.50"
[190.50]
15.12"
[384.05]
9.00"
[228.60]
4.50"
[114.30]
3.69"
[93.72]
2.19"
[55.63]
9.81"
[248.17]
HOLES FOR .38"
BOLTS AS INDICATED
002105-006 REV H
REPLACEMENT BRUSH ASSEMBLIES
MODEL NUMBER PART NUMBER DESCRIPTION
136B
056135-001 RB136
236B
056135-002 RB236
OPERATION AT TEMPERATURES ABOVE 50°C
FIGURE C
136B TYPES
FIGURE D
236B TYPES
FIGURE E
F136B AND
F236B TYPES
FIGURE F
OPERATION IN “STEP-UP” CONNECTION
FIGURE G
FIGURE I
6. Rotate the radiator several times to check for smooth travel of the brush over
the commutator surface. The brush should
fi
t
fl
at over the entire commutator
surface. No space should be visible between the brush and the surface.
SUPERIOR ELECTRIC • ONE COWLES ROAD • PLAINVILLE, CT 06062 USA
www.superiorelectric.com
Telephone and Fax Numbers
Telephone 860-507-2025
Fax 860--507-2050
Customer Service 860-507-2025, Ext. 70782
Product Application 860-507-2025, Ext. 72058
Toll-Free (in USA and Canada only)
Telephone 1-800-787-3532
Fax 1-800-821-1369
Customer Service
1-800-787-3532, Ext. 70782
Product Application 1-800-787-3532, Ext. 72058
ONE COWLES ROAD
PLAINVILLE, CT 06062 USA
www.superiorelectric.com
Printed in USA
