NORD Drivesystems BU0100 - Manual (Page 18)

NORDAC SK 160E
18 Technical modifications observed BU 0100 GB
4 Electronic Reversing Starter SK 160E
4.1 Principle of function
With the SK 160E, a motor can be switched in both
directions. For protection purposes, there is a locking time
for the immediate reversal that can be set with 2 rotary
dip code switches. The selection or release of the drive
occurs through a 24 VDC control signal. The integrated
temperature can be monitored via a temperature probe or
control. A design with a rectifier - integrated or separately
installed in the terminal box – is available for the
activation of a brake.
Features:
o
The SK 160E contains power switches that are activated via a 24 VDC control signal [RUN-RIGHT]
or [RUN-LEFT] and pass the system voltage to the motor windings.
(RUN-RIGHT = Right running (clockwise), RUN-LEFT = Left running (counterclockwise))
o
2 rotary dip code switches determine the locking time in case of direct direction reversal.
o
At the same time, the electromechanical brake (if available) is released through the integrated brake
rectifier (option).
o
If the control signal is removed, the voltage supply of the motor windings is interrupted and the brake
(if present) is applied again.
o
During the entire operation, the motor can be thermally monitored through temperature probes acting
like an overload cut-out. There are 2 monitoring modes that can be selected through a slide switch.
During automatic operation (slide switch set to [ON]), the SK 160E switches the motor off
automatically and reports the excess temperature by removing the OK message (fault signal, signal
[OK] changes to low). If the automatic operation has not been selected (slide switch set to [OFF]), then
only the OK message is removed and the drive continues to run. The inputs must be connected with a
jumper if temperature monitoring is not desired.
o
In automatic operation, the motor does not automatically start even after cooling. To restart, the
control signal [RUN-RIGHT] or [RUN-LEFT] must first be switched off and then on again. Alternatively,
the internal slide switch can be switched [OFF] and [ON] again. Caution, the drive starts immediately!
o
The basic direction is predetermined by the system input phases. This can be altered by exchanging
2 phases. For the correct phase sequence, [RUN-RIGHT] corresponds to a clockwise motor direction.
o
The current status of the SK 160E is shown through 2 LEDs. These are visible from the outside
through a transparent screw plug.
o
Series SK 160E in the versions SK 160E-1-0 and SK 160E-1-BSG2 fulfil the requirements for
explosion protection (ATEX) in Zone 22 according to the currently valid standards according to EN
50281 (Guideline 94/9/EG).
SK 160E