Many machines pose hazards to the operator while trying to clear jams, setting up, or other operational aspects that requires interaction. There are many safe drive monitoring features that can be applied to make the operation safer, with safe speed monitoring and standstill monitoring the most prevalent.  These are used not only during the normal automatic operation of the machine but also during manual operation of the machine to lower the risk and keep the operator safe.

The DINA safe drive monitors utilize a new, innovative approach: a parallel connection to the three-drive phases allows the frequency of the rotating field to be detected. This method for monitoring the drive can indicate specific motor speeds and standstill. It is cost effective because it does not require the use of sensors, encoders, or other measuring devices. The technology can be used for three- and single-phase drives, up to performance level e.

ANSI B11.19 – 2019 section 9.3.3 goes into great detail about safe speed monitoring functions. In combination with the safe speed monitoring safety function, the standard recommends hold-to-run enabling devices like our TFH232 foot switch or ZSD handheld device to run the machine. Upon the request of the manual control of the machine DN3PD1 or PD2 can be used to allow the machine to run with possibility of various safe drive functions like SLS, SSR, or SSM.  Either of the DINA units detects the standstill speed of the motor allowing safer unlocking function of the gate interlock.