ETS-Lindgren SMART 1000 Mini-Reverb Cell - Manual (Page 25)

Tuners | 25
E LECTRICAL
The tuner motor is connected to the control unit at the factory and supplied with a
length of conduit appropriate to the chamber. The control unit should be mounted
on the wall of the chamber within easy reach to operate the emergency switch.
Each tuner motor is a three-phase unit with a variable speed drive control. Each
motor uses less than eight amps under normal load.
The unit should be connected to a protected 208–230 volt, 15A supply, with the
wires connected as follows:
Brown: Phase 1
Blue: Phase 2
Green / Yellow: Earth
For chambers with two tuners, the motor controllers can be connected to a single
20-amp supply.
V ERTICAL T UNER I NSTALLATION
1. Install the motor end of the tuner as described in the installation
procedures beginning on page 18.
2. Using on the inner mounting plate, mount the idler bearing as
described in the installation procedures beginning on page 18.
3. Fix the plate to the inner shield surface using adhesive or wood screws
penetrating only the inner surface of the panel.
Tuner Control – SMART 1000
The SMART™ (Statistical Mode Averaging Reverberation Test Site)
1000 chambers are fitted with a dedicated motor drive control unit mounted onto
the back of the chamber. This unit controls the motors for both the vertical and
horizontal tuners. The motors are linked to 10:1 gear box and use half-stepping,
providing 400 steps per revolution. The motor controller is set so that the
required angular position of the motor is defined by θ/4.5, which means that the
angular position used in the seek command must be divided by 4.5.