Limit Board And Etsl System; Limit Board Version 2 Software; Hardware Requirements; Limit Board Wiring - O. Thompson Microflite Ultra 2000 Installation & Adjustment Manual

Microflite Ultra 2000
Section 8 Limit Board & ETSL System
8.1

Limit Board Version 2 Software

O. Thompson has released an enhanced version of Limit board software for use on the Microflite
Ultra 2000 Control System. This new software utilizes a rotary encoder to monitor the position of
the car in the hoistway. By constantly monitoring the position of the car, the Limit board will have
the ability to gently slow and stop the car if it is approaching either the top or bottom of travel at a
speed greater than the normal deceleration rate. This deceleration rate is slightly greater than the
normal deceleration rate, and will not be detectable by any passengers who may be in the car.

8.1.1 Hardware Requirements

The Version 2 software requires a Limit board with Revision level 2.0 or greater. If an earlier
version of hardware is used the board could intermittently trip.
8.2

Limit Board Wiring

This version of software requires an input from a rotary encoder attached to the hoist motor. If
this software is installed on an existing controller, an encoder feed must be wired into the board
at connector J9. Also, if the controller's existing Limit board did not have the speed reference
signal wired to it, it must be installed for the board to function properly. Refer to Figure 1 below
for the proper wiring of the board.
Revision AA2.2 Printed 03 - 15 - 03 8- 1