Kollmorgen MMC Smart Drive Series, Hardware Manual

Page: 331 / 386

Kollmorgen - June 2014 329
MMC Smart Drive Hardware Manual
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RESOLVER INTERFACE OPTION MODULE
12 Resolver Interface Option Module
The Resolver Interface Option module can be installed in the 230V or 460V Smart
Drive. It cannot be installed in an S200-DLS Drive or the Smart Drive NextGen. This
section describes the Resolver Interface Option Module in detail.
12.1 Theory of Operation
The Resolver Interface Option Module provides the interface between the resolver
and the drive’s DSP. It is a tracking system where the rotor is excited with a sine wave.
The outputs of the resolver are amplitude modulated by the sine and cosine of the
rotor shaft angle. The tracking converter converts the sine and cosine amplitude ratio
into a 12 bit number.
The module provides a 4 Vrms 5 kHz sine wave to excite the resolver rotor. The
resolver transformer ratio is .5:1 so the stator outputs are 2V RMS with the shaft
rotated to the angle of maximum coupling. The sine and cosine rotor outputs are
returned to the resolver module’s twin instrumentation amplifier inputs to produce a
high common mode noise rejection and a high input impedance (220K

). The sine
and cosine signals are then fed to a resolver to digital converter chip that performs the
tracking conversion. The converter has both a serial output and an encoder emulator
output. The serial output is read when the drive is powered up to obtain the absolute
commutation angle for the motor. Thereafter, it is used as an encoder emulator.
The module is able to detect a loss of feedback by monitoring the sine and cosine
signals. If both are near zero at the same time, a loss of feedback error is generated.
12.2 Installing the Resolver Module
1. If the Resolver Module is being installed in a 230V drive, remove the five screws
at the corners of the cover and remove the cover. If the Resolver Module is being
installed in a 460V drive, turn the 2 locking screws on the front of the drive clock-
wise and remove the MMC Smart Drive board from the drive chassis.
2. Remove the shunt from the 24-pin DIP socket located on the MMC Smart Drive
board (
See Figure 12-1 on page 330 ).
3. If there are not two standoffs already installed on either side of the 24-pin DIP
socket on the MMC Smart Drive board, proceed to step 10.
4. If there are nylon standoffs snapped into the Resolver Module, remove and dis-
card them. If there are nylon standoffs included with the Resolver Module, discard
them.
5. Remove and save the two nylon screws that are threaded into the standoffs
mounted to the MMC Smart Drive board.
6. Position the Resolver Module so the mounting holes align with the standoffs, and
the header is aligned with the socket (
See Figure1 12-2 on page 331 ).
7. Using even pressure, press the option module into place.
8. Screw the Resolver Module to the standoffs using the screws removed in step 5.
9. Verify that the module is fully seated into the socket and proceed to step 15.
10. If there are standoffs installed in the Resolver Module, proceed to step 12.
11. Install the snap-in standoffs that were included with the Resolver Module into the
Resolver Module. From the back of the Resolver Module (the side that has the 24-
pin header on it), insert the short (slotted) end of the standoffs into the mounting
holes.