The fuse is to be installed in series with the terminal 1
of the SCRB-68 control. Follow the procedure outlined
below to replace the SCRB unit and install the fuse.
1. Place the POWER, OFF-ON Selector Switch in the
OFF position and lock the electrical disconnect
switch in the OFF position. Then open the electrical
control panel to obtain access to the SCRB-52/58
unit.
2. Disconnect the wires from the terminals on the
SCRB-52/58 unit. The wires will be re-connected to
the new unit, therefore, make certain the wires are
labeled before disconnecting them. Also the correct
wire number from the wire being taken off of the
SCRB-52/58 should be written into the blanks
above the terminals on Figure 6.
3. Loosen the four (4) mounting screws that secure
the SCRB-52/58 unit to the panel just enough to
permit removal of the unit. Then remove the unit
from the control panel.
4. Install the SCRB-68 unit in the control panel and
tighten the four (4) associated mounting screws
securely.
5. Connect the wires (previously removed in Step 2) to
the terminals on the SCRB-68 unit. Refer to Figure
6 for wiring details.
NOTE: A jumper must be installed between termi-
nals 5 and 7 on the SCRB-68. Failure to
install this jumper will result in an inoperable
SCRB-68.
6. The fuse holder (furnished) should be installed as
close to the 100 Volt transformer as possible. Begin
by drilling and tapping two (2) #10 - 24 holes in the
control panel to anchor the fuse holder. Then mount
and secure the fuse holder to the panel.
CAUTION
WHEN DRILLING AND TAPPING HOLES FOR THE
FUSE HOLDER MAKE SURE THAT NO METAL
SHAVINGS FALL ON ANY CIRCUIT BOARDS OR
ANY OTHER ELECTRIC DEVICES.
7. Remove the wire from terminal “Y1” of the trans-
former and re-label it “1Y1.” (NOTE: Re-label both
ends of the wire.) Then attach the wire to the bottom
side of the fuse.
8. Run a #16 ga. MTW grade wire (or equivalent) from
the top of the fuse to terminal “Y1” of the 100 Volt
transformer. Label this wire “Y1.”
9. After completing Steps 1 through 8, close up the
electrical control panel. Then refer to the Adjust-
ment section of this manual.
WARNING
VOLTAGE THAT COULD BE FATAL TO HUMAN LIFE
IS PRESENT WITHIN THE ELECTRICAL CONTROL
CIRCUITS. ONLY AUTHORIZED, EXPERIENCED
PERSONNEL SHOULD ATTEMPT THE INSTALLA-
TION AND SERVICING OF ELECTRICAL EQUIP-
MENT.
— 13 —
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