FX Series Positioning Controllers Operation, Maintenance and Inspection 8
8-3
8.1.5 Direction of motor rotation
This section explains the setting to drive the motor correctly.
Direction of motor rotation
The direction of motor rotation is determined by the settings of PARA 12 and PARA 15 and by
the method used to connect the positioning unit and the drive unit.
The direction of motor rotation and the direction of machine travel in response to forward rotation
pulses depend on the method used to connect the drive unit and the machine specifications.
8.1.6 Connection of limit switches
Incorrect connection of the limit switches may operate the motor incorrectly.
Note: When PARA 20 is set to "0", input of pulses is stopped when the LS is turned ON.
When PARA 20 is set to "1", input of pulses is stopped when the LS is turned OFF.
• Install the LSF and the LSR in a position a little outside the usual operation envelope.
Table 8.1: Direction of motor rotation
PARA.12 Direction of rotation setting "0" Direction of rotation setting "1"
Present value
Increased by forward rotation pulses (FP)
Decreased by reverse rotation pulses (RP)
Decreased by forward rotation pulses (FP)
Increased by reverse rotation pulses (RP)
Instruction
operations
+x and +y instructions generate forward
rotation pulses (FP)
-x and -y instructions generate reverse
rotation pulses (RP)
+x and +y instructions generate reverse
rotation pulses (RP)
-x and -y instructions generate forward
rotation pulses (FP)
FWD input
JOG+input
Generate forward rotation pulses (FP) Generate reverse rotation pulses (RP)
RVS input
JOG-input
Generate reverse rotation pulses (RP) Generate forward rotation pulses (FP)
Zero return
direction
When PARA 15 is set to "0", forward rota-
tion pulses (FP) are generated
When PARA 15 is set to "1", reverse rota-
tion pulses (RP) are generated
When PARA 15 is set to "0", reverse rota-
tion pulses (RP) are generated
When PARA 15 is set to "1", forward rota-
tion pulses (FP) are generated
Table 8.2: Connection of limit switches
Type For stepping motor For servo motor
LS
connection
Connected to positioning unit.
Drive unit always ON.
Connected to the drive unit.
Positioning unit always ON (refer to
remarks below).
LSF
When LSF is turned OFF (refer to note
below), input of forward rotation pulses
(FP) is stopped and escape is possible
using the RVS operation input.
When LSF is turned OFF, forward pulses
inside the drive unit are stopped and
reverse pulses are accepted.
LSR
When LSR is turned OFF (refer to note
below), input of reverse rotation pulses
(RP) is stopped and escape is possible
using the FWD operation input.
When LSR is turned OFF, reverse pulses
inside the drive unit are stopped and for-
ward pulses are accepted.
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