TM 5-3895-374-24-1
Reference No. 278AS
Bulletin No. 30072-013-10
April, 1992
ASSEMBLY
INSTRUCTIONS
SHORT CIRCUIT
PROTECTION
DISTANT CONTROL
To replace the coil, first
assemble the magnet, replacement coil and armature. Manually operate the contact
carrier and insert the complete unit. Before installing the cover, manually operate the
device as described in "Manual Operation" to insure that all parts are functioning properly.
Follow recommended tightening torques (refer to Table 2) when reassembling device.
Figure 1 shows how contactors and starters are assembled. Factory recommended
torques for mechanical, electrical and pressure wire connections are listed in Table 2 and
in the device instruction sheet. These torques must be followed to insure proper device
operation.
Table 2
Factory Recommended Tightening Torques
Item
Description
Tightening Torque (in-lb)
A
Cover screws (2 per cover)
18-21
B
Coil terminal pressure wire connector (2 per coil)
9-12
C
Power plant screws (2 per device)
18-21
D
Internal auxiliary contact pressure wire connector (2 per contact)
9-12
E
Stationary contact fasteners (2 per pole)
6-9
F
Lug screw (2 per pole)
è
G
Auxiliary wire binding screws
18-21
H
Overload relay fastening screws (2 per overload block)
18-21
J
Overload switch module fastening screw (1 per module)
9-12
K
Switch module pressure wire connectors (standard is 2 per module,
with alarm circuit contact there are 4)
9-12
L
Overload to contact fasteners
(1 per pole)
18-21‚
M
Overload thermal unit fastening screw (2 per pole)
18-21
O
Lug retaining screw - Size 1P only (1 per pole)
18-21
? See instruction sheet.
? For contactor see instruction sheet.
Provide branch-circuit overcurrent protection for starters, referring to instructions supplied
with the thermal unit selection table. Provide branch-circuit overcurrent protection for
contactors (Class 8502 or 8702) in accordance with the National Electrical Code. Do not
exceed the maximum protective device ratings listed in Table 3.
Table 3
Maximum Ampere Ratings
Maximum Ampere Rating
Class KS, RK5
Class J
Inverse-Time
Maximum
or RK1 Fuse
or T Fuse
Circuit Breaker
Voltage
(Ampere)
(Ampere)
(Ampere)
600
30
60
40
250
40
60
60
Series impedance and shunt capacitance of the control circuit must be considered to
assure proper operation of contactors and starters when controlled from remote operator
stations. Depending upon the voltage, wire size and number of control wires used, series
impedance or shunt capacitance may limit the maximum distance of the wire run. If
distances to start or stop stations are longer than those listed in Table 4, the ,wire-run
configuration and materials must be analyzed. For further information, contact your local
Square D field office for Product Data Bulletin M379.
Table 4 Maximum Control Distance
Coil Voltage
Maximum Control Distance (feet)
(60 Hz)
#14 Copper Wire
#12 Copper Wire
120
845
1300
240
595
495
480
145
120
© 1992 Square D All Rights Reserved
(PAGE 3-110)
