Applied Motion STAC6-C - Manual (Page 5)

5
STAC6 Hardware manual 920-0029 Rev. C
5/2/2012
• Never pull out or plug in the product while the system is live. There is a danger of electric arcing and
danger to persons and contacts.
• After powering down the product, wait at least ten minutes before touching live sections of the equipment
or undoing connections (e.g., contacts, screwed connections). Capacitors can store dangerous voltages for
long periods of time after power has been switched off. To be safe, measure the contact points with a meter
before touching.
Be alert to the potential for personal injury. Follow the recommended precautions and safe operating
practices. Safety notices in this manual provide important information. Read and be familiar with these
instructions before attempting installation, operation, or maintenance. The purpose of this section is to alert
users to possible safety hazards associated with this equipment and the precautions that need to be taken to
reduce the risk of personal injury and damage to the equipment.
Failure to observe these precautions could result in serious bodily injury, damage to the equipment ,or
operational difficulty.
Over-Current Protection
The STAC6 has hardware over-current detection circuits that protect the drive against “phase to ground”
and “phase to phase” motor shorts. These circuits directly disable the amplifier in a rapid fashion to prevent
damage to the driver circuitry.
Typically, the over-current circuitry will react to an over-current condition in 3 to 5 micro-seconds. For a
short occurring in a motor, the motor leads provide enough resistance and inductance to keep the peak
current from exceeding the peak rating of the power transistors during this time period. The recommended
motors for the STAC6 all include 10 foot cables.
In essence the motor/cable system is a part of the over-current circuitry. If the drive is
directly shorted with a very short wire, this condition may cause current conditions that
exceed the peak current rating of our power transistors and therefore could weaken or
cause failure in the drive power devices.
Repetitive short circuits also risk damage to the drive. If a short circuit fault occurs,
please power off the drive and investigate carefully before restoring power.