Baldor MN770 User Manual
Page 26
Section 1
General Information
Set-Up Information 5-5
MN770
Inverter Controls
AC induction motors may have their speed adjusted by using an AC Inverter (VVVF) to
change the voltage and frequency supplied to the motor. The motor speed will be
relatively proportional to the frequency supplied. An AC Inverter must be able to supply
the amount of current the motor requires both on a continuous and peak basis under all
conditions of load and speed.
Note: Do not assume that having the required horsepower is sufficient information to
size the control. You will need to know the maximum voltage and current. The
motor nameplate should be the source for the RMS (continuous) ratings but
actual measurements should be made to determine the maximum required
current and voltage with the elevator loaded to capacity.
Initial Installation and Startup
When installed in a panel, the Series 15H control should be located away from sources of
heat and in an area where the keypad is visible and convenient to operate. Refer to
Series 15H manual (MN715) for installation information, watts loss requirements, and
other information regarding the selection of a mounting location. Expansion boards
should be installed before applying power.
Preliminary Programming After the control has been mounted and wired, the final settings can be made.
1.
Level 1 Input Block, Operating Mode.
2.
Level 1 Output Block, Opto Outputs.
3.
Level 1 V/Hz and Boost, starting with:
CTRL BASE FREQ
60
TORQUE BOOST
5
DYNAMIC BOOST
10
SLIP COMP ADJ
2.0
V/HZ PROFILE
3PT
V/HZ 3 PT. VOLTS
10
V/HZ 3PT. FREQ
1.6
MAX OUTPUT VOLTS
100
4.
Level 2 Output Limits Block, all parameters.
OPERATING ZONE
QUIET CT
PK CURRENT LIMIT
Set to max available
5.
Level 2 Motor Data Block, all parameters.
6.
Level 2 Brake Adjust, all parameters.
7.
Set the following Level 2, Protection Block, EXTERNAL TRIP parameter to ON.
8.
Calculate the size of the dynamic brake (DB) Hardware required. Refer to
MN701 for sizing and selection information. Connect the DB hardware as
described in MN715.
9.
Operate the elevator at inspection speed. Check for correct operation of the
elevator.
10. Operate the elevator at contract speed. Adjust the ACCEL, DECEL and
S-CURVE parameter values as required for the best ride.
Note: In many elevator applications, the STANDARD RUN or 15 SPEED MODE is
used depending on the elevator controller as well as an external S-curve
generator.