Baldor Baldor Manual Do Utilizador

Troubleshooting 5-3

MN850

  Continued

Initial motor kick
then bad start

Verify that AC input power and motor power wires are not reversed. 

(The motor will give an initial kick then  start very roughly.)

Current is not
displayed

1. Verify the current transformer connections at J3 control terminal.
2. Verify that the soft–start control is correctly sized.

Motor does not
accelerate

1. Verify the Current Limit parameter value and increase if necessary.
2. Verify the Ramp Time parameter value and decrease if necessary.
3. Excessive motor current, decrease load.
4. Insufficient break away torque.  Change pedestal voltage value to allow greater break away torque.

Fuse(s) blown

1. Excessive start time.
2. Fuse undersized.  Use only specified fuses for UL short circuit current ratings (see Section 2).

Cannot change
starting from
“Remote” to
“Keypad”

Remote start input. Factory preset start input is Programmable Input 1 terminals S1 and S0.  If a start voltage has

been applied to S1 and S0, you cannot change to Keypad until the start command is removed. Therefore,
remove the start voltage from S1 and S0 and then change to keypad.

5MC–PCB

1
2

3
4

5
6

7
8

9

10

11
12

RUN

TOR

3 Phase

Motor

L3

L2

L1

T3

T2

T1

1

2

3

4

5

6

Red

Yellow

Red

Yellow

Red

Yellow

Red

Yellow

Red

Yellow

Red

Yellow