2.8.5
Basic VFD Features
The VFD shall have the following basic features with no more then three
separate internal electronic boards.
a.
VFD mounted operator control keypad capable of:
(1)
Remote/Local operator selection with password access.
(2)
Run/Stop and manual speed commands.
(3)
All programming functions.
(4)
b.
(1)
VFD status.
(2)
Frequency.
(3)
RPM of motor.
(4)
Phase current.
(5)
Fault diagnostics in descriptive text.
(6)
All programmed parameters.
c.
Standard PI loop controller with input terminal for controlled
variable and parameter settings made while inverter running.
d.
User interface terminals for end-user remote control of VFD speed,
speed feedback, and isolated form C SPDT relay energized on drive
fault condition.
e.
An isolated form C SPDT auxiliary relay energized on run command.
f.
The VFD shall have a metal NEMA 1 enclosure.
g.
The VFD shall have an adjustable carrier frequency with 16 KHz
minimum upper limit.
h.
The VFD shall have a built in or external line reactor with 3%
minimum impedance to protect DC buss capacitors and rectifier
2.8.6
Programmable Parameters
The VFD shall include the following operator programmable parameters:
a.
Upper limit frequency.
b.
c.
d.
Deceleration rate.
SECTION 15910N
Page 54