Lenze MCH Series User Manual

Page 60

13435744_EDBMH01_v13

The AUTO 1 - 3 settings allow the drive to start into a spinning load after a fault or upon

application of input power. As with POWER UP, the drive MUST be in AUTO mode,

and the start command MUST be present after a fault or when power is applied for this

function to operate.
When set for AUTO 1, 2 or 3, the drive will attempt five restarts after a fault. During the

interval between restart attempts, the drive will display START PENDING to indicate

that the equipment will automatically restart. If all five restart attempts are unsuccessful,

the drive will trip into FAULT LOCKOUT, which requires a manual reset. Every 15

minutes that passes will decrement the restart counter by one. Therefore, 75 minutes

after a successful restart, the restart counter is fully reset, and the drive can once again

attempt five restarts.
NOTE 1:

When set for AUTO 1, 2 or 3, only the first two restart attempts will perform

a speed search to start into a spinning load. The last three restart attempts

will apply DC braking (at the voltage level programmed into Parameter 12

- DC BRAKE) for 15 seconds and then start from zero speed.

NOTE 2:

The drive will NOT restart after a CONTROL or PWR SAG fault. Also, if an

OUTPUT fault occurs below 1.5 Hz, only one restart will be attempted, after

a 30 second delay. If unsuccessful, it will then trip into FAULT LOCKOUT,

which requires a manual reset. This is done to protect the drive in case of

a shorted motor.

STOP METHOD

This parameter selects whether the motor will COAST to a stop, or RAMP to a stop,

when the drive is given a stop command.
COAST

When a stop command is given, the drive shuts off the output to the

motor, allowing it to coast to a stop. In this mode, the time it takes

the motor to stop is governed by the inertia of the driven load.

RAMP

When a stop command is given, the drive will decelerate the motor

to a stop over a period of time according to Parameter 9 - DECEL.

SPEED SRC KEY (SPEED SOURCE KEY)

This parameter ENABLES or DISABLES the SPEED SOURCE key on the keypad. The

SPEED SOURCE key can be used to change the speed reference source. Refer to

Section 13.1 - KEYPAD FUNCTIONS.
ENABLED

The SPEED SOURCE key is active and can be used to select

HAND ONLY, AUTO ONLY or NORM SRC.

DISABLED

The SPEED SOURCE key is disabled and cannot be used to select

HAND ONLY, AUTO ONLY or NORM SRC.

NOTE:

If the SPEED SOURCE key is disabled, the drive will respond to the last

speed source selected before the SPEED SOURCE key was disabled. For

example, if the SPEED SOURCE key was used to select HAND ONLY,

and then the SPEED SOURCE key is disabled, the drive speed will be

controlled by the HAND SOURCE only.