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3.19.4 Hinge installation
1. Remove the existing hinge (if present) in the
6" space.
2. Install the unit support bracket per 89-H2B
installation manual unit only.
3. Locate and install the new hinge with the two
mounting screws.
4. Install the door using two new hinge pins
supplied with the unit.
3.19.5 Terminal block swing plate
1. Remove the unit from the structure.
2. Loosen screw "B" shown in Figure 67.
3. Lift the handle bracket and pull forward to
disengage.
4. Rotate the left side of the unit open as shown
in Figure 59.
5. When closing the unit, the handle must be in
the "OFF" position.
Handle bracket
Figure 67
3.20 Insulation (Megger) test
Take resistance measurements before a motor
control center is placed into service, after installation
or maintenance. When performing resistance
measurements in motor control centers use an
insulation tester (Megger) with a potential of
500-1000 V.
Take readings between each phase and from each
phase to ground. This should be done with the
branch disconnects "OFF" and again, with the branch
disconnects "ON".
3.20.1 Branch disconnects "OFF"
Typically readings taken with all disconnects in the
"OFF" position should be between 5-20 megaohms.
Screw "B"
New equipment which was stored in a damp area
may register lower upon initial startup. If readings
are above one megaohm during start-up the
following procedure may be observed to help dry
the motor control center. Energize several individual
control units. If individual readings are above one
megaohm, energize additional units. After the
equipment has been in operation for 48 hours,
the readings should be in the 5-20 megaohm
range. If at any time megger readings are below
5 megaohm (one megohm during start-up)
consult your local Siemens sales office.
tiastar™ Motor Control Centers Instruction Manual Installation
Hazardous voltage.
Will cause death or serious
personal injury.
The main disconnect must be in the
OFF position during all megger
testing of the motor control center.
Devices such as solid-state
components, capacitor units, or any
other devices which are not designed
to withstand megger voltage, should
be disconnected before testing the
rest of the motor control center.
29
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