DS4 C
HAPTER
2 - I
NSTALLATION
2-9
The Drive-Up contact closure (internally) indicates to
the outside world that the BDS4 amplifier is in the
Drive-Up mode; or when the contact is open, it
indicates the Inhibit mode. The contact is rated at
115 VAC at 2 amps (green LED indicates Drive
Ready).
The Drive-Up relay acts in conjunction with the
Enable circuit in one of two possible modes of
operation as determined by optional jumper J21. To
determine which mode of operation is being utilized,
refer to J21 on the TEST LIMITS SHEET.
1. Drive-Up Mode
J21 is not installed on the BDS4-COMP Board.
Apply power.
When the Enable input circuit is activated (pulled
low), the internal Drive-Up contact will close and the
green Drive Ready LED will become illuminated.
However, when the Enable input circuit is not
activated, or a fault occurs, the internal Drive-Up
contact will be open and the green Drive Ready LED
will be off indicating that the BDS4 is in the Inhibit
Mode.
If a fault occurs within the BDS4, the Drive Ready
LED will turn off and the Drive-Up contact will open
and remain open regardless of the state of the Enable
input circuit.
2. O.K. to Enable/Drive-Up Mode
JR21 is installed on the BDS4-COMP Board
(Standard).
Apply power.
When there are no faults present, the internal Drive-
Up contact will be closed and the green Drive Ready
LED will be illuminated indicating that the BDS4 is
OK-TO-ENABLE. However if there is a fault
present, the Drive-Up contact will be open and the
Drive Ready LED off indicating that the BDS4 is in a
fault mode. In this case, activating the Enable input
circuit will not enable the BDS4.
Pin 12 Aux IN
This is an additional single ended input to the
velocity loop. This input may be used in adaptive
mode applications or used as the tach input for
integrally motor-mounted tachometer generators.
Pin 13 I Limit
The Current Limit input allows access to the Current
Limit circuitry providing a means by which inputs
may be applied for adaptive control applications.
This single ended input may also be used to adjust the
peak current limit of the amplifier from 7.5% to
100% of its rating. A positive voltage from 0 VDC to
7.5 VDC corresponds to 7.5% to 100% respectively.
Also, a resistor to common may be used to program
the current limit with 75% of I peak = 8.6 K Ohm,
50% of I peak = 3.3 K Ohm. The Current Limit
Adjustment Pot may also be used to adjust the peak
torque of the motor to the desired level.
Pin 14 Torque Hold
The BDS4 may be converted from a constant velocity
amplifier to a constant torque amplifier (at stall only)
by closing a circuit between Pin 14 and common (via
internal 20 K Ohm pull-up resistor). The velocity
loop operational amplifier is maintained at unity gain
while in this mode of operation.
Pin 18 I Monitor
There is a direct relationship between the signal
appearing at this output and actual motor current. A
DC voltmeter placed between Pin 18 and common,
calibrated in either current or torque, can be used to
estimate the constant load levels placed on the motor.
The current scale factor at Pin 18 is 8V = Peak RMS
current rating of the BDS4 (3 K Ohm output
impedance). This output is for reference only. Its
accuracy decreases as current decreases: +/- 4% at
peak current, +/-9% at continuous current, +/- 12% at
1/2 continuous current.
Pin 19 Speed Monitor
There is a direct relationship between the signal
appearing at this output and actual motor speed. A
DC voltmeter (or other instrument) placed between
Pin 19 and common, calibrated in RPM, can serve as
a means by which speeds may be monitored. Refer to
the TL Sheet for the scale factor in volts/RPM (8
volts = maximum speed) as listed on the TL Sheet for
the particular motor/amplifier combination (3K Ohm
output impedance).
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