3W1 Operation
This operat1on is dependent on the number of pulses and the intervals of time between them.
Two series of pulses are required – a first series for the selection of a selector coil circuit and a second series for selection of a group solenoid.
The number of pulses in each series is determined by which Wall-0-Matic selection switches are pressed. There will be from 2 to 21 in the first series and from 1 to 5 in the second series.
The rate of the pulses and the time interval between them is determined by the design of the Wall-0-Matic and the motor speed. This interval between individual pulses in both series is approximately 1/25 second and an interval of approximately 1/5 second occurs between the last pulse of the first series and the first pulse of the second series.
The motor is designed to operate the Wall-0-Matic through a complete cycle in a little more than 2 seconds. If the motor is slow, the current impulses to the step relay (in the Selection Receiver) will be slow and cause erratic operation of the step switch assembly. The motor can best be checked for speed by allowing it to operate steadily and counting the turns per minute of the contact arm. Normal speed is 24 revolutions per minute. Acceptable speed limits are 21 to 26 rpm. If the motor is slow, check for binding or excessive friction. If the motor runs slow when there are no hinds, it will have to be replaced.
