15
4.0 Structure a n d fun ctio n
4.3 Requirements for
third party control units
(mandatory in medical
applications)
Control units not approved by Ewellix for CPMT pillars, are
treated as third party control units.
NOTE
It is strongly recommended to use original Ewellix 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.
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.
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
values for each type.
The third party control must enable the drive to draw cur-
rents up to 25 A for 200 ms after switching on (start-up cur-
rent). The excess power shut-off feature can also be tempo-
rarily 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 compati-
bility. The operating time and duty cycle of the CPMT pillar may
not be exceeded (⮑ “Technical data”, Appendix, page 31).
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.
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 applica-
tion, it is recommended to have an operational signal in-
stalled in the third party control unit.
For the 2-Hall encoder impulse transmitter, the third party
control unit must fulfill the following additional requirements:
• Feed the hall sensors with a current of 4,5–26,5 V DC and
a current limit of no more than 200 mA.
• Load the hall sensor outlets with a maximum of 20 mA.
• Connect the hall sensor outlets to the supply with pull-up
resistors so that the signal of the open collector outlets
can be analyzed.
4.4 Connections
Electrical connection
The telescopic pillar is connected to the control unit via the
DIN-8 plug or the flying leads cable.
Connected load is 24 V–30 V DC and up to 12 A according
to the technical data (⮑ Appendix, page 31).
Important: Ensure that cables cannot get pinched or dam-
aged. Check that the mains voltage corresponds to the
nominal values on the type plate.
Fig. 5
Pin allocation and lead color code are given in the technical
specification in the appendix.
