Control Techniques Unidrive 1 Series, User Manual

Page: 26 / 208

Safety
Information
Product
Information
Mechanical
Installation
Electrical
Installation
Getting
Started
Menu 0
Running
the motor
Optimisation Macros
Advanced
Parameters
Technical
Data
Diagnostics
UL Listing
Information
26
Unidrive User Guide
www.controltechniques.com Issue Number: 9
3.8 Ventilation
Unidrive sizes 1-4 are ventilated by internally supplied heatsink fans.
Ensure the minimum clearances around the drive are maintained to
allow air to flow freely.
The Unidrive size 5 requires ventilation at the front (control) and rear
(heatsink) of the module.
Two parallel independent paths must be provided as shown to ensure
the heat produced is dispersed.
A heatsink fan is fitted as standard on request however this requires
either a 110Vac or 240Vac external single phase power supply to be
connected at the bottom left hand corner of the power module.
The choice of fan power supply must be made when ordering the power
module.
3.8.1 Ventilation requirements for the Size 5 power
module
Figure 3-16 Typical ventilation arrangement using the internal
heatsink fan
Cooling the heatsink
When designing the cooling system, allow for the rear of the power
module to produce 4kW of heat. This heat is dissipated in a heatsink that
is inside a vertical duct at the rear of the power module. Forced air-flow
is required through the duct in order to cool the heatsink.
If a fan is not fitted internally, the air flow must be obtained by an external
fan and ducting. The blanking plate at the lower end of the duct must be
removed in order to expose the inlet port (see Figure 3-17).
The air supply must be obtained from outside the enclosure and the
exhaust air must exit the enclosure. The maximum permissible heatsink
temperature is 95°C (203°F). Take the following precautions to help
ensure this is not exceeded:
1. Ensure the temperature of the air at the inlet port of the heatsink
does not exceed 40°C (104°F).
2. Ensure that the upward flow of the exhaust air from the top of the
heatsink will be unobstructed. Fit additional ducting having the same
cross-sectional area as the heatsink to extract all the exhaust air
from the enclosure.
3. Ensure the volume of the exhaust air is not less than 1,000m
3
/hr
(588ft
3
/min), equivalent airspeed 7m/s (23 ft/s). Measure the air-flow
to ensure it is adequate.
4. If the power module has a ventilation fan fitted in the heatsink, to
ensure that a sufficient amount of air is available to supply the fan,
locate the enclosure at least 300mm (12 in) from a wall or large
object that will be behind the enclosure. Fit a duct between the rear
panel of the enclosure and the inlet port at the rear of the heatsink.
If the power module does not have an internal fan, a forced air-flow
must be ducted into the inlet port at the bottom of the heatsink.
5. Ensure that the exhaust air is not recycled into the inlet port of the
heatsink or into the enclosure.
N
The solutions shown for Unidrive size 5 ventilation are to illustrate the
important points which must be considered. Many variations of this are
possible to suit the specific site conditions.
Exhaust
duct
Inlet duct
Power
module
Heatsink
Sharing choke
(for parallel
operation only)
Wall
Enclosure
Back-plate
Vent
≥
300mm
(12 in)
Fan for
cooling the
control
section
≥
150mm
(6 in)
≥
150mm (6 in)
400m /hr 3
(235 ft /min) 3
≥
1000m /hr
(588ft /min)
3
3
≥
≥
1 m/s
(3.3 ft/s)
≥
7 m/s (23 ft/s)
NOTE