Structure and function
4.3 Requirements for third party
control units (mandatory in
medical applications)
Control units not approved by SKF for CPMT pillars, are treated as
third party control units.
The secondary circuit of third party control units must be designed
as an overvoltage category 1 circuit. The third party control unit
must be fitted with an overload safety cut-off. The maximum power
input to the device should be only 0.5 A above the nominal value.
The maximum shut-off value may be only 1 A above the nominal
value. For example: The maximum power consumption is 12 A.
The recommended shut-off value is 12,5 A, the maximum cut-off
value is 13 A.
The third party control must enable the drive to draw currents up to
25 A for 200 ms after switching on (start-up current). The excess
power shut-off feature can also be temporarily de-activated for this
purpose.
The operating voltage of the CPMT pillar is 24-30 V DC. The
no-load voltage of 36 V DC must not be exceeded. After the system
has been installed, ensure electro-magnetic compatibility. The oper-
ating time and duty cycle of the CPMT pillar may not be exceeded
(
†
“Technical data”,
Appendix
,
page 52
).
Push-to-run operation (recommended): The pillar operates as
long as the switch is pressed. The device does not have signals to
indicate operation, and depending on the application, it is recom-
mended to have an operational signal installed in the third party
control unit.
!
Note!
It is strongly recommended to use original SKF controls
for the operation of the CPMT pillar. If third party controls are
used, there must be good documented evidence that the
requirements listed below are complied with.
!
Note!
The current cut-off has to be set differently if the main
load direction is in pull mode. Consult the Technical Data or
datasheet in this manual, for maximum power consumption val-
ues for each type.
!
Note!
The third party power supply must have an isolation
between the primary and secondary circuits according to 2
MOPP, and provide a non-grounded secondary circuit.
22
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