8
Plenum Mounting
The drive is UL rated for plenum mounting as well as auxiliary panels
that may be supplied with the drive. If the equipment is to be mounted in
the plenum, allow sufficient access for servicing. All normal clearance,
temperature, humidity limitations and local codes apply.
Grounding Plate
Drives up to 3 hp, 200 to 240 V, and up to 10 hp, 380 to 460 V and
550 to 600 V with a NEMA 1 enclosure have a plastic bottom cover with
provision for conduit entry. To meet UL requirements, the metal
grounding plate must be in place above the plastic bottom cover. The
plate must be grounded to the chassis and the conduit grounded to the
plate. If the grounding plate is not factory installed, it must be installed in
the drives that have a plastic bottom panel to ensure proper grounding
of the conduit to the enclosure. Connect the ground wire from the
grounding plate to the ground tab marked with the ground symbol.
This tab is located near the AC line terminal strip. Mount the bottom
cover on the control unit.
Shielded Wires
Wires to control signals should be shielded to reduce radio frequency
noise interference. When RFI is a concern, shielded cable should be
used between the drive and the motor.
If unshielded control wires are used, control inputs are subject to signal
disturbances. Such disturbances may affect drive operation. Extreme
noise levels may disturb the microprocessor of the control card.
The shield of the control wires must be grounded at the cable clamp at
the bottom of the drive, but the shield must continue with the cable all the
way up to the control card. The shield is not to be connected to any of
the terminals on the control card. For safety reasons, the insulation
around the shield should only be removed where it is connected to the
cable clamp. The insulation should be left on the shield between the
clamp and the terminals.
Generally speaking, all conductors coming from a shielded control
cable must be as short as possible. Long conductor ends attract noise.
The shield must be connected to the chassis by means of the cable
clamp. Long pigtails on the shield reduce the effectiveness of the shield.
Standard Service Conditions
The mechanical and electrical components of the TR1 Series VFDs can
be adversely affected by the environment. High temperatures and
harsh environments may reduce life of drive if proper precautions are
not taken.
Airborne Liquids
Rain, steam, oil, water vapor, high humidity, and such may cause
corrosion of drive components. In such environments, use NEMA 12
enclosures. NEMA 12 enclosures limit the exchange of outside air into
the drive enclosure. Extremely harsh environments may require a
higher levels of protection.
Solids
Dust, dirt, metal drill shavings, foreign objects and the like may cause
mechanical, electrical or thermal failure in the drive. A NEMA 1
enclosure provides a reasonable degree of protection against falling
particles but will not prevent the drive fan from pulling dirty air into the
drive. A typical indicator of excessive levels of airborne particles is dust
around the fan. In dusty environments, use NEMA 12 enclosures.
Corrosive Chemicals
In environments with high temperatures and humidity, corrosive gases
such as sulfur, nitrogen and chlorine compounds cause corrosion to
occur in the drive. Such chemical reactions rapidly affect and damage
electronic components. An indication of corrosion is blackened copper
or oxygenation of steel or aluminum. In such environments, it is
recommended that the equipment be mounted in a cabinet with fresh air
ventilation and that corrosive compounds be kept away from the drive.
A non-ventilated cabinet fitted with an air conditioner as a heat
exchanger may be used. Conformal coated circuit boards may be
specified to reduce the corrosive effects of a harsh environment.
Maximum Relative Humidity
95% non-condensing
Ambient Temperature
14°F to 104°F (-10°C to 40°C)
14°F to 122°F (-10°C to 50°C) for 200-240 V units of 40 hp or less
and 380-600 V units of 125 hp or less when used with motor leads of
50 ft (15m) or less
UL, C-UL, and CE Conformity
All 200-240 V and 380-460 V TR1 Series VFDs are CE marked. All
drives and option packages are UL and C-UL listed.
