Rockwell Automation 1500SM BULL 1500-ISOLATOR ADJ MAINT - Manual (Page 3)

Instructions • Adjustment and Maintainance
Bulletin 1500 Isolator Assembly
3
Mechanical Interlock of Contactor to Isolator (Refer to 80098-596)
• contactor operates lever, item 4, which prevents isolator from being
opened until contactor is open (drops out). This interlock is in addition to
the electrical interlocks.
• claw of item 5 will be encapsulated by item 4 until the contactor drops
out.
Switch Opening (Refer to 80098-595)
• as the isolating switch is opened using the isolator handle the electrical
interlock, “Isa” should open (the normally open auxiliary contact on the
left hand side at the isolating switch), before the mechanical interlock
comes into effect. At this time the blades of the isolating switch should
be engaged.
Switch Closing (Refer to 80090-595)
• the right hand electrical auxiliary (Isb), (the normally closed auxiliary
contactor on the right hand side of the switch) should not close before
the blades touch the grounding pins.
• ensure that isolator shutters close when the isolator is in the operating
position. They have been painted white for ease of viewing in the open
position.
The switch handle provided on our medium voltage starters should be
used in a firm manner. The proper procedure for operating the handle
is to move it from the “on” to “off” position or vice versa in one fluid
motion. Do not attempt to merely inch it into a new position as it may
resist this type of procedure. The isolator should be engaged and
disengaged as quickly as possible to minimize arcing at the isolator
switch plates. The handle has been designed with this in mind.
Operational Checks