Kb-electronics KBVF-48 Instrukcja Użytkownika Pobierz pdf (Strona 13)

4 IMPORTANT APPLICATION INFORMATION

4

.1 MOTOR WITH EXTERNAL FAN

COOLING – Most totally enclosed fan-

cooled (TEFC) and open ventilated 3-

p

hase AC induction motors will over-

h

eat if used beyond a limited speed

range at full torque. Therefore, it is nec-

essary to reduce motor load as speed

i

s decreased.

N

ote: Some fan-cooled motors can be

used over a wider speed range.

Consult the motor manufacturer for

d

etails.

WARNING! Some motors have

low speed characteristics which

cause overheating and winding failure

under light load or no load conditions.

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.

Do not use motor if the motor cur-

rent exceeds the nameplate rating.

It is recommended 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

Figure 6.

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 recommended.

Mount the fan or blower so the

motor is surrounded by the air-

flow. See Figure 7.

4.2 ELECTRONIC MOTOR

OVERLOAD PROTECTION –

The drive contains Modified I

2

t

Overload Protection.* Part of this

function consists of a Current

Limit (CL) circuit, which limits the

drive current to a factory preset

13

60

Motor Speed (%)

TEFC and Open Ventilated

50304010020

Motors

Maximum Allowed

Motor Torque (%)

40

20

60

0

and TENV

I

nverter Duty

100

80

100907080

Motors

Fan Cooled

FIGURE 6 – MAXIMUM ALLOWED MOTOR TORQUE vs. SPEED

Selectable Jumpers

A/M

CON2

CON1

J2 50/60Hz

CON3

J1X2X1

P1

F - S - R

PWR

P3P2

ST

Diagnostic LEDs

Main Speed Potentiometer

and Signal Input Terminals

MINCL MAX ACCDEC/B COMP

Adjustable Trimpots

FIGURE 5 – EXPANDED VIEW OF JUMPERS AND TRIMPOTS

Open Ventilated Motor

(100 CFM Min.)

Fan or Blower

Airflow

FIGURE 7 – OPEN VENTILATED MOTOR WITH EXTERNAL COOLING

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 28 29

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