Delta Tau Geo MACRO, Руководство пользователя и справочное руководство

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Geo MACRO Drive User Manual
22 Connections
installation practices must be followed. The use of inductor chokes in the output of the drive will help
keep these leakage currents below breaker threshold levels.
Transformer and Filter Sizing
Incoming power design considerations for use with Geo Drives require some over rating. In general, it is
recommended that all 3-phase systems using transformers and incoming filter chokes be allotted a 25%
over size to keep the impedances of these inserted devices from affecting stated system performance. In
general, it is recommended that all single-phase systems up to 1kW be designed for a 50% overload. All
single-phase systems over 1kW should be designed for a 200% overload capacity.
Noise Problems
When problems do occur often it points to electrical noise as the source of the problem. When this
occurs, turn to controlling high-frequency current paths. If following the grounding instructions does not
work, insert chokes in the motor phases. These chokes can be as simple as several wraps of the individual
motor leads through a ferrite ring core (such as Micrometals T400-26D). This adds high-frequency
impedance to the outgoing motor cable thereby making it harder for high-frequency noise to leave the
control cabinet area. Care should be taken to be certain that the core’s temperature is in a reasonable
range after installing such devices.
Operating Temperature
It is important that the ambient operating temperature of the Geo Drive be kept within specifications. The
Geo Drive is installed in an enclosure such as a NEMA cabinet. The internal temperature of the cabinet
must be kept under the Geo Drive Ambient Temperature specifications. It is sometimes desirable to
roughly calculate the heat generated by the devices in the cabinet to determine if some type of ventilation
or air conditioning is required. For these calculations the Geo Drive’s internal heat losses must be known.
Budget 100W per axis for 1.5A drives, 150W per axis for 3A drives, 200W per axis for 5A drives, 375W
per axis for 10A drives, 500W per axis for 15A drives, 650W per axis for 20A drives.
From 0°C to 45°C ambient no derating required. Above 45°C, derate the continuous and peak output
current by 2.5% per °C above 45°C. Maximum ambient is 55°C.
Single Phase Operation
Due to the nature of power transfer physics, it is not recommended that any system design attempt to
consume more than 2kW from any single-phase mains supply. Even this level requires careful
considerations. The simple bridge rectifier front end of the Geo Drive, as with all other drives of this
type, require high peak currents. Attempting to transfer power from a single-phase system getting one
charging pulse each 8.3 milliseconds causes excessively high peak currents that can be limited by power
mains impedances. The Geo Drive output voltage sags, the input rectifiers are stressed, and these current
pulses cause power quality problems in other equipment connected to the same line. While it is possible
to operate drives on single-phase power, the actual power delivered to the motor must be considered.
Never design expecting more than 1.5 HP total from any 115V single-phase system and never more than
2.5 HP from any 230V single-phase system.