Harmony Control. This speed monitor monitors a rotating axis for exceedance or undershoot of a set limit value (0.1-1200 rpm, 0.002-20 Hz). An additional sensor must be connected for detection (3-wire proximity switch PNP or NPN, NAMUR proximity switch, potential-free auxiliary switch, voltage signal 0-30 V). The monitoring type, the limit value and a switching delay are adjustable. An error memory can also be activated, which holds the message until a reset. The wide-voltage power supply (24-240 VAC/DC) enables universal use. The cable connection is made via screw terminals.