Rockwell Automation 1746-QS,D17466.19 SYNCHRONIZED AXES MODULE - Manual (Page 14)

2–6
Publication 1746-6.19 March 1998
5. Avoid valves with a slow response (less than 60 Hz). Valves with
slow response cause the module to overcompensate for disturbances in
the motion of the system. Since the system does not respond immediately
to the control signal, the module continues to increase the drive signal.
By the time the system begins to respond to the error, the control signal
has become too large and the system overshoots. The module then
attempts to control in the opposite direction, but again overshoots. These
valves can cause the system to oscillate around the set point as the
module overshoots first in one direction, then the other.
We recommend that you use the Interface Module (IFM) terminal
block (Cat. No. 1492-AIFMQS) to connect module I/O and power.
It facilitates power supply, shield, and fuse connections.
It is required for CE certification.
The pre-wired cable that connects the IFM terminal block to the
module is available in standard sizes as indicated by its part number,
1492-ACABLExxxQ, where xxx indicates the length in meters:
length: xxx:
0.5 m 005
1.0 m 010
2.5 m 025
Important: Because the sytem was certified with a shorter cable,
you must re-certify the system if using the 2.5 m cable.
Publication 1492-5.1 describes the IFM terminal block and cables.
For information on the entire line of Allen-Bradley Interface
Modules and associated cables for wiring analog systems, refer to
publication 1492-2.15.
Regarding the Interface
Module Terminal Block
(Cat. No. 1492-AIFMQS)
and Cable