Applied Motion 3540i - Manual (Page 6)

Mounting the Optional MMI
There are two ways to mount the MMI in your application. No matter which method
you choose, you'll need to connect the MMI to your 3540i with the programming
cable. You will not, however, need the adapter plug. The MMI has the same
telephone style connector as the 3540i.
Depending on how you mount the MMI and cable in your application, you may find
that it is difficult to remove the cable from the back of the MMI. If this is the case,
and you need to reprogram the 3540i, you can use any telephone line cord as a
programming cable. They are available at most supermarkets and discount stores.
Please be careful not to lose the adapter plug that connects the telephone cord to
the COM port of your PC. The adapter is a custom made part and is only available
from Applied Motion.
-6- -15-
Current
The maximum supply current you could ever need is the sum of the two phase
currents. However, you will generally need a lot less than that, depending on the
motor type, voltage speed and load conditions. That's because the 3540i uses
switching amplifiers, converting a high voltage and low current into lower voltage
and higher current. The more the power supply voltage exceeds the motor voltage,
the less current you’ll need from the power supply. A motor running from a 24 volt
supply can be expected to draw only half the supply current that it would with a 12
volt supply.
We recommend the following selection procedure:
1. If you plan to use only a few drives, get a power supply with at least twice the
rated phase current of the motor.
2. If you are designing for mass production and must minimize cost, get one
power supply with more than twice the rated current of the motor. Install the motor
in the application and monitor the current coming out of the power supply and into
the drive at various motor loads. This will tell you how much current you really
need so you can design in a lower cost power supply. If you plan to use a
regulated power supply you may encounter a problem with current fold back. When
you first power up your drive, the full current of both motor phases will be drawn for
a few milliseconds while the stator field is being established. After that the
amplifiers start chopping and much less current is drawn from the power supply. If
your power supply thinks this initial surge is a short circuit it may “fold back” to a
lower voltage. Because of that, unregulated power supplies are better. They are
also less expensive. Mounting the Drive
You can mount your drive on the wide or the narrow side of the chassis. If you
mount the drive on the wide side, use #6 screws through the four corner holes. For
narrow side mounting applications, you can use #6 screws in the two side holes.
The 3540i drive will dissipate heat better if you mount it on the narrow
side. Please use narrow side mounting whenever possible.
The amplifiers in the 3540i generate heat. To operate the drive continuously at
maximum power you may need additional heat sinking or forced air cooling.
Never use your drive in a space where there is no air flow or where
other devices cause the surrounding air to be more than 50˚ C. Don't
put the drive where it can get wet or where metal particles can get on
it.
smooth flat surface
#6 screws
wide side mount narrow side mount