15
MECHANICAL INSTALLATION
Powerdrive MD2SL Installation and maintenance
5077 - 2017.12 / b
en
2.3.3.3 - Cooling circuit characteristics
The drive global cooling system is made of aluminium for the
heatsinks. stainless steel for the customer connection. and
nitrile for the link between these two circuits.
Breakdown of exchange surface areas
according to the material
Rating
Material
Exchange surface area (mm²)
180T
- 570T &
340TH
- 600TH
750T
- 1100T &
750TH
- 1200TH
1400T
- 1700T &
1500TH
- 1800TH
Aluminium
178 206
356 412
534 618
Stainless steel
139 744
279 488
419 232
Nitrile
159 592
319 184
478 776
The recommended fluids are therefore drinking or
demineralised water or a mixture of water and glycol up to a
50%-50% ratio. Salt water is prohibited.
We recommend use of an external cooling loop so that the
fluid is used in a closed circuit.
• Liquid quality
Since the drive most stressed components are totally liquid-
cooled. liquid characteristics directly affects the quality of
cooling and therefore the drive service life.
To prevent electrochemical corrosion and obstruction due to
sediment. ensure that the cooling agent used satisfies the
following criteria:
• sulphate content <150 mg/l
•
pH between 6 and 9
•
electrical conductivity <100 μS/cm
• chlorides <100 mg/l
• iron <0.5 mg/l
•
ion chloride concentration < 1000 ppm at 20°C
• Liquid temperature rise
In steady state. the maximum temperature rise for the coolant
at the drive output with the minimum recommended fluid flow
rate is 8°C.
• Protection against electrochemical corrosion
When an external coolant loop is being used. it is advisable to
add an inhibitor to prevent electrochemical corrosion.
If there is no external loop. such corrosion must be prevented
by using materials compatible with the materials used in
the drive cooling circuit (see table above with breakdown of
exchange surface areas according to the material).
• Protection against obstruction due to sediment
A coolant with too many particles in it can speed up obstruction
of the heatsinks due to sediment. and it is therefore advisable
to install filters upstream of the drive fluid system.
2.3.3.4 - Draining and servicing
The frequency of the draining and servicing cycles depends
on the quality of the coolant. These cycles must therefore
be determined according to the quality of the fluid used and
designed to suit the installation.
Temperature rises caused by passive components and circuit
boards can create condensation on the heatsinks or the
pipework connections. depending on the moisture in the air
and the difference in temperature between the inside of the
cabinet and the cooling circuit.
It is therefore advisable to have a coolant temperature
as close as possible to the cabinet internal temperature
depending on how much the drive is used. This can be
achieved by reducing the ambient temperature or by
increasing the fluid temperature (comply with the maximum
temperatures described in section
).
However. if condensation occurs. it will be directed to a drain
pan. This pan should be checked regularly depending on the
conditions of use and likely occurrence of condensation.
A biannual draining and servicing cycle for the drain pan
circuit is recommended.
• Draining the water system
Powerdrive MD2SL
is equipped with a drainage system for
the water circuit. Before performing a draining refer to §7 -
Maintenance.
To access the water system drain valve. remove the 3
knurled nuts. then the vertical ramp protective plate. Take the
discharge pipe outside the
Powerdrive MD2SL
cabinet and
open the valve on the bottom drain pan (see the diagram next
page).
Once servicing is complete. make sure that the valve is closed
correctly before reattaching the vertical ramp protective plate.
• Condensate drain pan
The
Powerdrive MD2SL
is fitted with a condensate drain
pan. If condensation occurs. it will be directed into this pan.
The outlet for this drain pan should be connected to a
drainage system. well away from any live parts.
Regularly check that the orifice on this pan is not
obstructed so that condensates can be drained outside the
Powerdrive MD2SL
cabinet. See the diagram next page.
