Baldor MN770 manual Section Hardware Information, General Considerations, Encoder Retrofit

Section 4

Hardware Information

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
	ªAuto-tuneº 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 (0.34mm2) 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 (0.34mm2) wire to the braided shield.

3.Connect all shields to J1-30. To do this, solder a ªDrain Wireº 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.

MN770 Hardware Information 4-1