68
ADVANCED USER GUIDE
Commander SX
IP66/Nema 4X variable speed drive
MENU 6: PROGRAMMABLE LOGIC AND TIMERS
CONTROL TECHNIQUES
3854 en - 03.2008 / b
: Downstream contactor management
Adjustment range :0 or 1
Factory setting :0
0 (No) (OFF): Downstream contactor inactive.
1 (Yes) (On): Enables management of the downstream
contactor (contactor between the drive and the motor). For
safety reasons in certain applications, a contactor placed on
the drive output (U, V, W) disconnects the motor supply.
Remote control of this contactor is independent of the drive
and can deactivate or activate the motor supply with the
enabled drive run command. So that the drive does not detect
a fault, 6.51 must be set to 1. The drive detects opening and
closing of the contactor by controlling the motor current.
When the motor current is less than the setting configured in
6.53, the drive considers that the contactor is open and
sends a phase-to-phase voltage (set by 6.52).
When the contactor closes again, the DC voltage sent to the
motor creates a current that enables the drive to detect
closure of the contactor and restart the motor (the motor
accelerates up to the set speed reference).
: Downstream contactor voltage
Adjustment range :0 to 25.0% of 5.09
Factory setting :3.0% of 5.09
When downstream contactor management is enabled (6.51
at 1), the drive must detect whether or not the motor is
connected. To do this, the drive applies a low voltage which
can be set using 6.52, as a percentage of the motor rated
voltage. In general, the factory setting is suitable for most
applications.
: Downstream contactor current threshold
Adjustment range :0 to 100.0% of 5.07
Factory setting :10.0% of 5.07
When downstream contactor management is enabled, 6.53
sets the current detection threshold below which the drive
considers the downstream contactor to be open.
: Downstream contactor status
Adjustment range :0 or 1
0 (Open) (OPen): The downstream contactor is open; the
motor is disconnected from the drive.
1 (Closed) (CLoS): The downstream contactor is closed; the
motor is connected to the drive.
6.51
6.52
6.53
6.54
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