Kb-electronics KBDA-48 Bedienungsanleitung PDF herunterladen (Seite 16)

4 IMPORTANT APPLICATION INFORMATION

4.1 MOTOR WITH EXTERNAL FAN COOLING – Most totally enclosed fan-cooled (TEFC) and open

ventilated 3-phase AC induction motors will overheat if used beyond a limited speed range at full

tor

que. Therefore, it is necessary to reduce motor load as speed is decreased.

Note: Some fan-cooled motors can be used over a wider speed range. Consult the motor

manufactur

er for details.

WARNING! Some

motors have low

speed characteristics,

which cause overheating

and winding failur

e under

light load or no load con-

ditions. If the motor is

operated in this manner

for an extended period of

time, it is recommended

that the unloaded motor

current be checked from

2 – 15 Hz (60 – 450 RPM)

to ensure motor current

does not exceed the

nameplate rating. If the

motor current exceeds the

nameplate rating, the

Boost value may have to

be decreased (see

Function No. 3.11). Do

not use motor if the

motor current exceeds

the nameplate rating.

It is r

ecommended

that the drive be

used with Inverter Duty

or TENV motors.

Inverter duty and most totally enclosed non-ventilated (TENV) motors can provide full rated torque

over an extended speed range without overheating. See Figur

e 8.

If external fan cooling is provided, open ventilated motors can also achieve an extended speed

range at full rated torque. A box fan or blower with a minimum of 100 CFM per HP is recommend-

ed. Mount the fan or blower so the motor is surrounded by the airflow. See Figure 9.

4.2 ELECTRONIC MOTOR OVERLOAD PROTECTION – The drive contains Modified I

t Overload

Protection.* Part of this function consists of a Curr

ent Limit (CL) circuit, which limits the drive cur-

rent to a preset level of 160% of the Motor Nameplate Rated Current setting. The factory setting

for motor nameplate curr

ent is the drive rated current, which must be set to the actual

motor nameplate current (see Important Application Information (Item 2), on page 4). See

Table 3, on page 10. Also see Function No. 0.01, on page 32.

Standard I

t is undesirable because it causes nuisance tripping. It allows a very high motor cur-

ent to develop and will turn the drive off after a short period of time. KB’s RMS Current Limit

Circuit avoids this nuisance tripping while providing maximum motor protection.

FIGURE 8 – MAXIMUM ALLOWED MOTOR TORQUE VS. SPEED

FIGURE 9 – OPEN VENTILATED MOTOR WITH EXTERNAL FAN COOLING

10060 70 805030 40100 20 90

Motor Speed (%)

and TENV Motors

Inverter Duty

Maximum Allowed

Motor Torque (%)

100

TEFC and Open Ventilated

Motors

Fan Cooled

Open Ventilated Motor

Fan or Blower

(100 CFM per HP Min.)

Airflow

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 56 57

Kommentare zu diesen Handbüchern

Keine Kommentare

Kb-electronics KBDA-48 Bedienungsanleitung Seite 16

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Software Kb-electronics KBDA-48