Minster SCRB-68, Руководство пользователя

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Option C: Conversion from a SCR-22/28 to a
SCRB-68
The MINSTER Model SCRB-68 and Model SCR-22/28
eddy current coupling controls are completely inter-
changeable, even though their physical appearance is
somewhat different. However, since there is a slight dif-
ference in terminal strip designation between the units,
this step-by-step procedure has been prepared to aid
the technician in interchanging the controls.
NOTE: A 3.2 amp fuse must be installed in the 100-120
Volt AC control power circuit. Install the fuse in series
with terminal 1 on the SCRB-68 control.
The terminal strip designation of the late Model SCR-
22/28 control is different from that of earlier models.
This difference appears in the eddy current field coil
terminology and was the result of the motor manufac-
turer’s changing the designation of these leads from
“C1-C2” for “clutch” to “F1-F2” for “field.” Late model
controls are arranged for the “F1-F2” designation. The
reverse side of the SCR-22 terminal strip also carries
the old terminology and may be turned over, if desired,
so that the strip terminology will match that of the leads.
Both types are shown in Figure 8.
If an optional torque limiter control is attached to the
SCR-22/28 unit, terminals Z1 and Z2 (located on the
torque limiter) should be connected to the motor cur-
rent transformer. See Figure 8 for details.
The Model SCRB-68 control has a terminal strip simi-
lar to that shown in Figure 8.
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Figure 8. SCR-22/28 replacement worksheet.