2-8
MN716
Table 2-5 J2 Position vs Motor Horsepower
Jumper J2 Position Motor Current
(DC AMPS)
Motor Horsepower
90VDC
180VDC
15A (1)
1-1/2
3
10A
1
2
7.5A
3/4
1-1/2
5.0A
1/2, 1/3
1. 3/4
2.5A
1/4
1/2
J3 - Motor Armature Voltage
Select the desired armature voltage by placing J3 in the proper position, 90 or 180. See Figure 2-1.
Note: For 115 volt AC line input, the armature voltage must be set to 90. For 230 volt input, the armature
voltage normally is set for 180. However, it is also possible to set the armature voltage to 90 for
step-down operation.
Table 2-6 Relationship of Voltage and Jumper Position
AC Input Voltage
J1A, J1B Position
J3 Position
Motor Voltage
115
115
90
90
230
230
180
180
230
230
90*
90*
* A 90VDC motor can be used with a 230VAC line. However, speed range may be reduced and motor overheating may result.
J4 – Tachometer Voltage
Place J4 in the position 7V, 20/30, 50V that corresponds to the tachometer voltage in Volts/1000. See
Figure 2-9.
Note: Selection of the jumper position is not required if armature feedback is used.) The tach voltage
jumper position is based on motor speed of 1,800 RPM.
For example, if the tach is 25V/1000 and the motor speed is 3,600 RPM, use the 50V position.
For other tach voltages and motor speeds, an external resistor (RT) may be used as follows:
1. Place J4 in 7V position
2. Calculate the value of (RT) as follows:
RT = [(5.4 x VT x S) 68,000] ohms
VT = Tach Voltage in Volts/1000 RPM
S = Base speed of motor in RPM
Note: Choose the closest standard 1/2 watt resistor value to the calculated value.
3. Install resistor (RT) in series with either tachometer lead.
Note: For tachometer feedback, Jumper J5 must be in the TFB position.
J5 - FEEDBACK TYPE
The BC200/BC201 can be operated in either armature feedback, AFB or tachometer feedback, TFB.
Armature feedback provides adequate load regulation for most applications. For very precise
performance, tachometer feedback, TFB should be used.
Notes:
1. If tach feedback is desired, an external DC tachometer must be used and connected.
2. The IR Comp trimpot must be set to the minimum setting [CCW] for tachometer feedback.
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