Product manual

Danaher Motion 05/2008 Detailed Wiring Information
S200-CNS Product Manual 53
10.10 USING THE DAC MONITORS
The S200 PN has two analog outputs for use by the customer at J4. Each has a list of possible
assignments and a default value as listed in the S200 Position Node User’s Guide. The DAC (Digital
to Analog Converters) are OPAMP (Operational Amplifier) outputs and care should be taken to
assure noise-free signal reception. The range of each monitor is 0.5Vdc to 4.5Vdc and have an
internal source impedance of 2k ohms. This internal impedance limits to short circuit current to 2mA
and can be a source of signal attenuation if too much load is drawn from these outputs. These
outputs are intended to feed instrumentation such as an Analog input to a host or an oscilloscope for
function monitoring. Each DAC Monitor output supplies a single-ended output voltage referenced to
the I/O RTN pin. The use of shielded, twisted pair wire is recommended if these circuits are to be
wired to another device. The shield should be tied to the frame of J4 at the drive and the frame of
the receiving equipment.
10.11 WIRING ENCODER OUTPUT SIGNALS
Available at J4 for the customer’s use are encoder equivalent output signals. These signals provide
incremental encoder performance for the motor driven by the S200 PN and can be used by a host
controller or monitor. The signals are differential driven and are RS-485 / RS 422 compliant. The use
of terminating resistors at the receiving end (120 ohm) is recommended. The output drivers are
short-circuit protected. The encoder resolution can be adjusted by switch S1 at the top of the drive
or by the S200 OC Tools software. Refer to the S200 User’s Guide for setup information on the
resolution of the output.
Wiring for these signals should be done with individually twisted/shielded pairs. Shields should be
tied at the frame of J4 at the S200 PN and at the frame of the receiving equipment. An additional
wire to tie the two system’s DC common together is highly recommended to prevent damage from
ground-shift spikes. Tie the connection to any I/O RTN pin on J4 at the S200 PN.
10.12 MOTOR WIRING
Good motor wiring practice is a must when applying any PWM controlled servo motor drive to the
motor. The S200 PN uses PWM voltage control to the motor. The frequency of the PWM may vary
according to the model number. PWM systems switch high voltage at very fast rates. This voltage
switching creates fast edged on the voltage signals traveling down the motor cable to the
servomotor. This switching voltage can couple capacitively in both the cable and the motor creating
high frequency current flows that must be controlled. Danaher Motion offers highly engineered
cables to provide the best control of these signals.
Should the user decide to wire the motor there are a few important recommendations that should be
followed:
The motor cable must have a separate conductor that carries the motor frame back to the S200
PN’s PE terminal designated for the motor cable.
Chosen cable should be at least 600V rated and should have relatively low capacitance. The motor
cable should have >90% shield coverage and the shield should be of braided design, not foil. The
cable shield should terminate, along with the motor case wire, to the S200 PN’s PE terminal
designated for the motor cable at the drive end and to the connector housing at the motor with a
360-degree bond attachment.
Motor cables should be uninterrupted from the drive to the motor. In case where this is not practical
the motor cable connection should be made with a connector type that allows 360 degree shield
coverage so that the cable shield appears uninterrupted.
Appendix A has more information on installation practices that allow for trouble-free installation.
Please read that section before proceeding.