Baldor MN770 - Manual (Page 18)

Section 4
Hardware Information
Hardware Information 4-1 MN770
General Considerations All Baldor Series H drives are designed for ease of use. The keypad interface provides
the same interface for each Series H control. In other words, if you are familiar with
parameter set-up for one Series H drive type, the set-up for another Series H drive is
similar.
Power and logic wiring are essentially the same. Depending on the technology, feedback
wiring may be different.
For elevator applications, it is not possible to uncouple the load from the motor to
“Auto-tune” the motor parameters. Therefore, the parameter values can be calculated
and manually entered manually.
Encoder Retrofit Use care when an encoder is to be installed on a motor that is not equipped with one. An
encoder may be used with a DC SCR or Vector control and motor. Encoders cannot be
used with inverter controls and motors. The encoder housing must be rigidly mounted to
the existing motor case and an anti-backlash coupling must be used. Baldor offers a
special encoder kit designed for modernization which includes the rugged 1024 PPR H25
encoder, adapter, special coupling, stub shaft, hardware and mounting template.
Electrical isolation of the encoder case and shaft from the motor is highly recommended
to prevent capacitively-coupled motor noise from degrading the encoder signal. This
feature is standard on Baldor’s Elevator Drive DC and Vector Drive motors. If the
encoder added during the modernization is later found to have electrical noise because it
couldn’t be electrically isolated, adding an Isolated Encoder expansion board may help
with the electrical noise problems.
Cable Preparation
Encoder wiring must be shielded twisted pairs, #22 AWG (0.34mm 2 ) minimum size, 200
′
maximum length, with an insulated overall shield. Belden 9891 and Manhattan M4190
cables are suitable.
Control End (See Figure 3-1.)
1. Strip the outside jacket approximately 0.375
″
(9.5mm) from the end.
2. Solder a #22 AWG (0.34mm 2 ) wire to the braided shield.
3. Connect all shields to J1-30. To do this, solder a “Drain Wire” from each shield
to the wire soldered to the braided shield in step 2.
4. Insulate or tape off ungrounded end of shields to prevent contact with other
conductors or ground.
Encoder End
1. Strip the outside jacket approximately 0.375
″
(9.5mm) from the end.
2. Identify each of the four twisted pair and label or use the color codes shown in
Figure 3-2 for the optional Baldor Encoder Cable.
3. Insulate or tape off ungrounded end of shields and unused conductors to
prevent contact with other conductors or ground.
CAUTION: Do not connect any shields to the encoder case or motor frame.
The encoder +5VDC supply at J1-29 is referenced to circuit board
common. Do not connect any shields to ground or another power
supply or damage to the control may result.