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Page 2
OPERATION (Continued)
The latch may have one or two trip (unlatch) solenoids.
Each solenoid has an isolated trip coil that may be AC or
DC operated. Either or both solenoids, when energized,
will trip the latch arm by pushing down the latch arm
located below the contactor armature, thus allowing the
armature to move into the open-contacts position. The
latch arm has a roller-bearing cam wheel on the end that
engages the armature, so that friction is minimized and
the trip action is fast.
The contactor pickup coil and trip solenoid coils are rated for
intermittent duty and will burn-out if energized continuously
under normal operating conditions. The contactor coil may
be operated at its rated voltage continuously if the armature
has been sealed against the magnet and both windings of
the coil are connected in series. There are many possible
operating schemes and diagrams, and the installer must
check the operation of the latch against the specified
diagram for the specific application. It is recommended that
the contactor and solenoid coils be automatically de-
energized by auxiliary contacts on the contactor itself,
without depending on supplementary relays elsewhere.
The latch sensitivity is adjustable. If unlatching occurs
accidentally from vibration or impact, the sensitivity
should be decreased. If either unlatch solenoid fails to
trip the latch when rated solenoid voltage is applied, then
the sensitivity should be increased. Refer to the section
on MAINTENANCE.
CONTROL POWER REQUIREMENTS
A control power transformer, whose primary winding is
connected to the same source supplying power to the
motor, is the usual source of control power used to close
the contactor. This same transformer can also be used
as the voltage source for the trip (unlatch-open) sole-
noids, but a manual operator (pushbutton type) must be
installed in order to open the contactor in case of a power
failure. Where a standby control voltage source (usually
battery-supplied DC) is available to operate a trip sole-
noid, the manual operation is not required. Most solenoid
coils furnished have both an AC and a DC intermittent
duty rating. See Table II for inrush VA requirements.
Some latch attachments are supplied with two trip
solenoids, each rated for a different voltage. The latch
attachment will unlatch when either solenoid is energized.
MANUAL UNLATCH OPERATOR
Where it is desirable or necessary to add a manual unlatch
(trip) operator, use Part Number 10935H3, an external
operator kit marked RESET. This operator requires a
1.20" (30 mm) diameter hole opposite the trip arm of the
latch attachment. The location of the latch trip target
center (1.20" diameter hole) is shown in Figure 2. A
faster and probably more accurate way to locate the
TABLE II. COIL INRUSH DATA
Coil Function
Close Contactor
110-120 VAC
Close Contactor
220-240 VAC
Close Contactor
Close Contactor
Open Contactor
Open Contactor
Open Contactor
Open Contactor
Open Contactor
target center is to use a temporary clamp to attach a 3-
inch (76 mm) right angle bracket to the face of the trip
arm with one leg of the bracket pointing towards the
door. Attach to this leg an eraser-tipped pencil or a strip
of any sponge material that will absorb stamp pad ink or
similar marking material.
Position the pencil along the extended leg so that the ink-
soaked projection will strike the inside of the door when it
is closed. Use the mark on the door to select the unlatch
(reset) operator center.
After installing the RESET operator, adjust its operating
length (cutting the threaded stud if necessary) so that the
trip arm can be pushed sufficiently far to unlatch the
contactor. Verify that door deflection does not unlatch the
contactor accidentally.
INSTALLATION
This industrial type control is designed to be installed,
operated, and maintained by adequately trained person-
nel, with adequate supervision. These instructions do not
cover all details, variations, or combinations of the
equipment, its storage, delivery, installation, check-out,
safe operation, or maintenance. Care must be exercised
to comply with local, state, and national regulations, as
well as safety practices, for this class of equipment.
WARNING: ALL WORK ON THIS CONTACTOR SHOULD
BE DONE WITH THE MAIN DISCONNECT DEVICE OPEN.
AS WITH ANY CONTACTOR OF THIS VOLTAGE CLASS,
THERE IS DANGER OF ELECTROCUTION AND/OR
SEVERE BURNS. MAKE CERTAIN THAT POWER IS OFF.
I.B. 48006
Rating
Volt-Amperes
1300
1400
125 VDC
1500
250 VDC
1600
AC
225
24 VDC
600
48 VDC
190
125 VDC
300
230 VDC
265
DANGER
Effective 11/97
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