Theory Of Operation - Kollmorgen BDS4 Series Installation And Setup Manual

C 1 - S
HAPTER YSTEM
from logic bus out-of-tolerance conditions and
motor stator short circuit conditions, both line-to-
line and line-to-ground.
•
Drive-Up contact closes indicating the amplifier
is ready for input command signal; opens on fault
conditions.
•
Standard PSR4/5 Power Supply units contain a
Soft Start function and a dynamic bus discharge
function.
•
The 12 and 20 amp PSR4/5 units have, as
standard, 40 watts of internal shunt regulation.
There are optional versions available having no
shunt regulator. Other options have externally
mounted power resistance allowing shunt
regulation of up to 700 watts. The shunt
regulator is protected from excessive peak
current by fuse. It is also protected from
excessive duty, if duty cycle exceeds a preset
limit, by shunt overload shutdown circuit.
•
The 50 and 75 amp PSR4/5 shunt regulation is
accomplished with externally mounted power
resistor(s) with ratings from 500 to 2000 watts as
standard. Special units may be ordered for even
higher power. The shunt regulator is protected
from excessive peak current by a thermal
overload relay. It is also protected from
excessive duty, if duty cycle exceeds a preset
limit, by shunt overload shutdown circuit.
•
Diagnostic LED indicators located on the front
panel on both the BDS4 and the PSR4/5
modules.
•
Either a 12-Bit Parallel Position Information
Card or an Encoder Equivalent Output Card as
available options.

1.4 THEORY OF OPERATION

The BDS4 brushless servo system consists of three
main components:
1. PSR4/5 - Power Supply Module
2. BDS4 - Amplifier Module
3. B - Brushless Motor
1-2
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D
ESCRIPTION
All of the compensation components necessary to
match a BDS4 amplifier to a particular motor such as,
current loop compensation, velocity loop
compensation, and torque angle compensation, are
located on the removable BDS4 COMP
compensation board located inside the BDS4
amplifier.
The TL (Test Limits and Modification) Sheet
contains the compensation component values and
such information as maximum operating speed, peak
current limits, etc. that are assigned to each BDS4
system.
Only motors having the identical base model number
may be run on the BDS4 amplifiers. If a motor
having a different base motor model number is to be
run on a BDS4, the BDS4-COMP compensation
board must be altered or changed accordingly. The
BDS4 must remain the same current and voltage
rating.
1.4.1 PSR4/5 Power Supply Module
Refer to Figure 1.1 for a quick reference of the
PSR4/5 and drawings A-93409, A-93408 and A-
93092 for precise details.
The PSR4/5 Power Supply Module is divided into
four (4) main sections:
1. The Unregulated Logic Bus, supplied by the
Control AC line input voltage (normally
single-phase 115 VAC), is described in
Section 4.2.
2. The 310/140 Main DC Bus is supplied by
the main AC line input voltage (normally
three-phase 230 VAC or single-phase 115
VAC).
3. The Soft-Start Feature (standard) resistor
limits the inrush current (to charge-up the
Main Bus Capacitors) to a specific amount
as listed in Appendix D.
4. The Shunt Regulator (regeneration) section
includes circuitry which monitors the main
bus. During deceleration profiles, the motor
basically operates as a DC generator and
pumps energy back into the main bus
causing the bus to rise. The Shunt Regulator
BDS4