NORD Drivesystems BU0040 - Manual (Page 51)

3 ControlBoxes – SK POT1-1
BU 0040 GB-0113 Subject to technical alterations 51
P1
P2
Boot UP display
After switching on, the lettering briefly appears in the display
Operation
Control of the Simple Setpoint Box SK SSX-3A in this mode is the same as that of the SimpleBox SK CSX-3H/ -3E
(see Section 2.2), however with the following differences:

No access to frequency inverter parameters is possible.

The display does not show the actual operating value of the frequency inverter, but rather the setpoint
value transferred from the SK SSX-3A.

The setpoint is displayed as a percentage (- 100.0% … 0.0 … 100.0%) and is scaleable (P050).

Pressing the "OK" key during operation does not save the displayed value as the "jog frequency" of the
frequency inverter (P113), but rather as the "Starting value" within the box (P051).
Control commands (Enable/Stop/Direction of rotation) from the box are processed additively by the frequency
inverter. An enable command from the box corresponds to an "Enable right".
If, for example, the frequency inverter is enabled by the box and also receives a parallel enable command ("Enable
left") via a digital input, the two enable commands cancel each other out. The drive runs down its braking ramp to
speed "0" and switches to the state "Ready for switch-on".
Processing of setpoint values is carried out according to the settings in parameter (P400[-05]). In the factory setting
of the parameter, the setpoint value of the SK SSX-3A has the properties of a master setpoint value. If setpoint
values from other sources are to be taken into account, these must be defined as auxiliary setpoints.
Example
Frequency inverter
SK 2x5E-...
Co
ntro
l terminal b
ar
44
40
.
.
21
22
23
24
.
.
.
SK SSX-3A
Potentio-
meter
0-10
L1 - L2/N - L3
115/230/400V
24V mains unit
SK CU4-24V-... L1 - L2/N
115/230/400V
24V=
GND
10V=
AGND
0-10V
IO-Link
0-100%
1/3~ 115/230/400V + PE
Control terminal bar
44 40 44 ... 11 14 12 B1
(br)
(bl)
(br) (wh) (bl)
C1 B1 40 44
Control terminal bar
In addition to the Simple Setpoint Box, a potentiometer is connected to an SK 2x5E type frequency inverter.
Its analog signal is converted into pulses in the SK CU4-
24V…mains unit and passed to Digital Input 3 of the
frequency inverter. After conversion of the function of Digital Input 3 (P420 [-03]) to the function {26} "Analog