Thermostats - Baldor MN605 Installation And Operating Manual

Standard Receptacle MS3112W12−10P
Standard Plug MS3116J12−10S

Thermostats

The thermostat is a pilot circuit device used in a protective relay circuit. Thermostat ratings are given in Table 2−3.
Blower Ventilation System
Before loading a force-ventilated motor, be sure that the blowers, cooling fans, or central air supply systems
are operating properly to supply cooling air to the motor. Air filters should also be in place. If you energize the
main fields with the motor at standstill, the blowers or external cooling systems must be left on. This will prevent
excessive heat buildup that will decrease the life of the insulation.
When using field economy circuits to reduce the voltage to the main fields during standstill, blowers do not need
to be left on.
Blower motors should be checked for correct rotation. Don't rely on feeling airflow from the drive end of the
motor. Look at the outline drawing or rotation arrow shown on the blower housing. Refer to Figure 2-2.
Size Motor Frame
LM2 180
LM3 180
LM3 210-250
LM4 280
LM6 320-400
LM8 504-506
LM9 508-5012
Note: Motor mounted blower units. Mount on commutator end (opposite drive end of motor. We supply blowers that are powered by totally enclosed motors (standard).
Blowers have a cast aluminum fan housing with washable, wire mesh filters.
MN605
Figure 2-1 Encoder Connections
Color Codes for Optional
Baldor Encoder Cable
Electrically
Isolated
Encoder
Table 2-3 Thermostat Ratings
Maximum Current Ratings for Thermostats (Normally Open or Closed Contacts)
Voltage 125VAC 250VAC
Amperage 12A 8A
Figure 2-2 View from Air Inlet (Motor is on Opposite Side)
Air Inlet
Housing
Impeller
Blades
Airflow
Table 2-4 Electrical Data - Forced Ventilation Blower Units
HP RPM
1/40 3000
1/8 3450
1/8 3450
1/3 3450
1 3450
3/4 1750
3 3450
A
H
B
J
C
K
D
F
E
24VDC Continuous Current All Voltages
2A 2A
Volts Phase
230 1
115/230 1
208-230/460 3
208-230/460 3
208-230/460 3
208-230/460 3
208-230/460 3
A
A
B
B G
C
C
F
+5V
COMMON
Hz
60
50/60
50/60
50/60
50/60
50/60
50/60
H A B
K J C
E D
Amps
0.4
2.6/1.3
0.66-0.60/0.30
1.5-1.4/0.7
3.1-3.0/1.5
3.4-3.2/1.6
8.2-7.6/3.8
2-3