PAGE 15 12-5-97 CHAPTER 2: INSTALLATION
2.4.17 CAUTION:
The drive develops an adjustable frequency via pulse width
modulation, with the pulse rise time of 0.1 microseconds. While this does not present a
problem on 200-230VaC applications, it may on 380-460Vac applications. When using the
drives on 380-460, where the distance between the motor and the Drive exceeds 60 feet,
get the motor manufacturer’s approval that his insulation system can withstand the
voltage spikes (up to twice the dc bus voltage 2 x 621Vdc for a 460Vac power source) of
the Drive, in conjunction with the long motor cable lengths. If the insulation system does
not meet this limit, utilize a filter to increase the Drive’s pulse rise time to 1.0
microseconds.
When using the drives on 575Vac, get the motor manufacturer’s approval that their
insulation system can withstand the voltage spikes (up to twice the dc bus voltage 2 x
813Vdc for a 575Vac power source) of the Drive, in conjunction with the motor cable
lengths.
2.4.18 CAUTION:
Because the ambient temperature greatly affects Drive life and
reliability, do not install the Drive in any location that exceeds the allowable temperatures.
Leave the ventilation cover attached for temperatures of between 40 (104
°
F) and 50 (122
°
F) degrees C (30 HP and lower). If the cover needs to be removed, another type of
enclosure may be required for safety purposes.
2.4.19 CAUTION:
If the Drive’s Fault Alarm is activated, consult the
TROUBLESHOOTING section of the AF-300$
GE Drive Instruction Book, and after
correcting the problem, resume operation. Do not reset the alarm automatically by
external sequence, etc.
2.4.20 CAUTION:
Be sure to remove the desicant dryer packet(s) when unpacking the
Drive. (If not removed these packets may become lodged in the fan or air passages and
cause the Drive to overheat.)
2.4.21 CAUTION:
AC induction motors require that they be sized based on the
applications speed range and associated torque requirements for the motor-Drive system.
This is to avoid excessive motor heating. Observe motor manufacturers
recommendations when operating any ac induction motor with the Drive. Also observe
motor manufacturer’s recommended voltage/torque boost at lower operating frequencies.
2.4.22 CAUTION:
The available power source connected to the Drive is not to exceed
500KVA. If the ac power source is greater than 500KVA and the Driver’s rating (HP) is less
than 10% of the power source’s KVA; ac line reactors will have to be installed in L1, L2 &
L3 power leads of the Drive.
2.4.23 CAUTION:
The Drive must be mounted on a wall that is constructed of heat
resistant material. While the Drive is operating, the temperature of the Drive’s cooling fins
can rise to a temperature of 90
°
C (194
°
F).
