Lenze S94P01B2 - Manual (Page 29)

S94P01B2
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Interface
4.4.4 MODBUS RTU Support
As a default, the RS232 and RS485 interfaces are configured to support MotionView
program operations. In addition, the RS485 interface can be configured to support the
MODBUS RTU slave protocol. The interface can be configured through the MotionView
program. When configured for MODBUS operation, the baud rate for RS485 is set by the
parameter “Modbus baud rate” in MotionView, while the RS232 baud rate is set on the
drive’s front panel. Thus RS485 and RS232 can have different speeds at the same time
if RS485 is configured for MODBUS operation. Please note that if RS485 is configured
for MODBUS operation, the command repeat function (see 4.4.3) is unavailable even if
baud rates are set the same for both interfaces.
The Modbus RTU slave interface protocol definitions can be found in the MotionView
help menu under “Product Manuals”.
4.5 Motor Selection
The PostionServo 940 drive is compatible with many 3-phase AC synchronous servo
motors. MotionView is equipped with a motor database which contains over 600 motors
for use with the 940 drive. If the desired motor is in the database, no data to set it up
is needed. Just select the motor and click “OK”. However, if your motor is not in the
database, it can still be used, but some electrical and mechanical data will need to be
provided to create a custom motor profile. The auto-phasing feature of the 940 allows
the user to correctly determine the relationship between phase voltage and hall sensor
signals, eliminating the need to use a multi-channel oscilloscope.
4.5.1 Motor Connection
Motor phase U, V, W (or R, S, T) are connected to terminal P7. It is very important that
motor cable shield is connected to Earth ground terminal (PE) or the drive’s case.
The motor feedback cable must be connected to encoder terminal P4 if the motor is
equipped with an incremental encoder. If the motor is equipped with a resolver it needs
to be connected to terminal P11 on the resolver option module.
4.5.2 Motor Over-Temperature Protection
If using a motor equipped with an encoder and PTC thermal sensor, the encoder
feedback cable will have flying leads exiting the P4 connector to be wired to the P7.1
(T1) and P7.2 (T2) terminals. If using a motor equipped with a Resolver and a PTC
sensor, the connector on the Resolver Option Module (P11) provides this connection.
Use parameter “Motor PTC Cut-off Resistance” (section 5.3.12) to set the resistance
which corresponds to maximum motor allowed temperature. The parameter “Motor
temperature sensor” must also be set to ENABLE. If the motor doesn’t have a PTC
sensor, set this parameter to DISABLE. This input will also work with N.C. thermal
switches which have only two states; Open or Closed. In this case “Motor PTC Cut-off
Resistance” parameter can be set to the default value.