User manual

Operational Considerations

3 Operational

Considerations

3.1 Limit Switches

M-116 stages are optionally available with two optical limit

sensors with TTL drivers. Limit switch outputs are active-high

for the DC-motor version. and active-low for the stepper motor

version. Models without the optional limit switches put the TTL

level indicating “no overtravel” on the limit switch lines. The

distance between the limit switches must be specified with the

order. If no reference switch is required, the limit switches may

be anywhere between 0º and 330º; if the reference is installed,

then the lower limit switch must be at ≥ 30º. Limit switch

installation is accurate to ±2°, limit switch repeatability is 0.004°.

3.2 Position Reference Signal Sensors

A position reference sensor is located approximately in the

middle of the operating range and can be used to reference the

absolute position of the stage within 0.004° accuracy. Always

approach the reference sensor from the same side to reach the

same position.

The reference sensor provides a static signal level which

depends on the platform position. If the platform position is less

than a half-turn counterclockwise from the reference switch

position, the reference signal is +5 V, while if the platform is

less than a half-turn clockwise from the reference switch, the

signal level is 0

3.3 Recommended Motor Controllers

M-116.DG and M-116.DGH stages can be used with C-842, C-

843, C-844, C-848 and Mercury (C-860, C-862) controllers, the

M-116.2S and M-116.2SH with the C-600 and C-630 stepper-

motor controllers.