Baldor MN850 用户手册

Installation 2-1

MN850

When you receive your control, there are several things you should do immediately.

1.

Observe the condition of the shipping container and report any damage
immediately to the commercial carrier that delivered your control.

2.

Remove the control from the carton.  Inspect for shipping damage and report
any damage immediately to your commercial carrier.

3.

Verify that the part number of the control you received is the same as the part
number listed on your purchase order.

4.

If the control is to be stored for several weeks before use, be sure that it is
stored in a location that is clean, dry and free from corrosives and
contaminants.  Storage temperature range is –25

°

C to 55

°

C.

Be sure to read an become familiar with the safety notices in Section 1 of this manual.
Failure to observe the product safety notices can result in injury or equipment damage.  
If you have questions, please contact your Baldor distributor.  Do not proceed unless you
understand the installation and operation requirements and safety notices.

The location of the soft–start control is important.  It should be installed in an area that is
protected from direct sunlight, corrosives, harmful gases or liquids, dust, metallic
particles, and vibration.  Exposure to these elements can reduce the operating life and
degrade performance of the control.

Several other factors should be carefully evaluated when selecting a location for
installation:

1.

For effective cooling and maintenance, the control should be mounted vertically
on a flat, smooth, non-flammable vertical surface.  Heat dissipation of 3.3 watts
per running FLA of the motor must be provided.  All factory supplied enclosures
provided adequate heat dissipation with ambient temperatures to 40

°

C.

2.

If the control is mounted in an enclosure, sufficient air flow must be provided
(see Table 2-1).  The fan or blower must be rated for at least 0.8 cubic feet of
30

°

C air per minute for each ampere of motor FLA rating.

inches (mm)

inches (mm)

inches (mm)

1

1 (25)

3 (75)

0.6 (15)

2

1 (25)

3 (75)

0.6 (15)

3

1 (25)

8 (200)

3.5 (90)

3.

Keep high voltage and low voltage wiring separated.  If  the conduits must
cross, be sure that they cross at 90

°

 angles only.

4.

Motor overload protection is required for motor branch circuits that do not have
an overload protection device.

5.

Front access must be provided to allow the control cover to be opened or
removed for service and to allow viewing of the Keypad Display (1 inch (25mm)
minimum).

6.

Altitude derating.  Up to 3300 feet (1000 meters), no derating required.  Above
3300 feet, derate peak output current by 1% for each 330 feet above 3300 feet.
6600 feet (2000 meters) maximum.

7.

Temperature derating.  Up to 40

°

C, no derating required.  Above 40

°

C, derate

full load current by 2% per 

°

C above 40

°

C. 

Maximum ambient is 60

°

C (at 40% derate).

8.

Short circuit current and overcurrent devices are required for soft–start controls
that do not have a circuit breaker or fusible disconnect switch.

9.

Dust–proof NEMA 12, NEMA 4 non–ventilated enclosure will require an end of
ramp Bypass contactor. This requires additional hardware.  Refer to Figure 2-6
for details.