{"id":30871,"date":"2026-03-19T16:16:44","date_gmt":"2026-03-19T15:16:44","guid":{"rendered":"https:\/\/rls-wacon.de\/produkt\/speed-monitoring-rc3\/"},"modified":"2026-03-19T16:16:44","modified_gmt":"2026-03-19T15:16:44","slug":"speed-monitoring-rc3","status":"publish","type":"product","link":"https:\/\/rls-wacon.de\/en\/produkt\/speed-monitoring-rc3\/","title":{"rendered":"Speed monitoring RC3"},"content":{"rendered":"

RC3 speed monitoring for escalators<\/h2>\n

Why is the speed monitored on escalators?<\/h3>\n

Speed monitoring is a safety-critical element in every escalator. According to the European standard EN 115:2008, escalators must be equipped with a reliable speed monitoring system that switches off the motor immediately in the event of dangerous speed deviations. An incorrect speed can lead to serious accidents<\/strong> – whether due to sudden acceleration (overspeed), unexpected braking (underspeed) or a reversal of direction. <\/p>\n

The RC3 speed monitor from RLS Wacon is a T\u00dcV type-tested safety component that has been used successfully in escalators and moving walks worldwide for many years. It reliably monitors three speed ranges and detects four different hazardous conditions, each of which leads to the escalator motor being switched off immediately. <\/p>\n

How does the RC3 speed monitor work?<\/h3>\n

The RC3 detects the speed of the escalator motor via two inductive proximity switches (NAMUR sensors), which are attached to the flywheel of the motor. The sensors are supplied with 9 V DC directly from the device (max. 50 mA per output) and do not require an external voltage source. Both 2-wire sensors (NAMUR) and 3-wire sensors can be adapted. <\/p>\n

The device continuously monitors three speed ranges and distinguishes between four switch-off criteria:<\/p>\n\n\n\n\n\n\n\n\n
Switch-off criterion<\/th>\nThreshold value<\/th>\nReaction<\/th>\n<\/tr>\n<\/thead>\n
Underspeed<\/strong><\/td>\n< 19.5 % RPM<\/sub><\/td>\nShutdown after 2.6 seconds<\/td>\n<\/tr>\n
Overspeed<\/strong><\/td>\n> 117 % RPMN<\/sub><\/td>\nImmediate shutdown<\/td>\n<\/tr>\n
Reversal of direction of rotation<\/strong><\/td>\nDrop from > 19.5 % to < 19.5 % UPMNENN<\/sub><\/td>\nImmediate shutdown<\/td>\n<\/tr>\n
Sensor failure<\/strong><\/td>\nShort circuit, interruption, oscillation<\/td>\nImmediate shutdown<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Each time the mains voltage is switched on, the RC3 performs an automatic self-test (max. 2.8 seconds). The sensors are switched off and all four switch-off conditions are simulated by an internal sweep generator. Only after a successful self-test and closed motor contactor contact does the green “NORMAL” LED light up and the output relays enable the motor. <\/p>\n

The safety output for staircase control contains two potential-free normally open contacts (terminals 17\/18) connected in series internally, which are looped into the safety chain and protected against overload with fuse F2 (2 Atr.). The STATUS terminal strip also has potential-free contacts for the status signal (NORMAL\/FAULT) and a conditioned sensor signal (optocoupler output). <\/p>\n

The first fault leading to shutdown is indicated by one of the four LEDs on the front panel (LO, HI, SENS FAIL, NORMAL). The device can only be reset by pressing the RESET button – locally or via the external RESET input (pin 1\/2) – after it has been checked by qualified personnel. In the event of a sensor fault or internal error, a restart is not possible without prior troubleshooting. <\/p>\n

Available sensor nominal frequencies<\/h3>\n

The RC3 is available in six different nominal sensor frequencies. The nominal frequency corresponds to the pulse frequency of the sensor at 100 % nominal speed of the escalator motor: <\/p>\n\n\n\n\n\n\n\n\n\n\n
Nominal frequency<\/th>\nItem no. Vertical<\/th>\nItem no. horizontal <\/th>\n<\/tr>\n<\/thead>\n
66\u2154 Hz<\/td>\n80-200300<\/td>\n80-200304<\/td>\n<\/tr>\n
80 Hz<\/td>\n80-200303<\/td>\n80-200305<\/td>\n<\/tr>\n
100 Hz<\/td>\n80-200301<\/td>\n80-200306<\/td>\n<\/tr>\n
250 Hz<\/td>\n80-200302<\/td>\n80-200307<\/td>\n<\/tr>\n
333 Hz<\/td>\n80-200311<\/td>\n80-200314<\/td>\n<\/tr>\n
500 Hz<\/td>\n80-200315<\/td>\n80-200316<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Advantages of speed monitoring RC3<\/h3>\n
    \n
  • T\u00dcV type-tested in accordance with EN 115:2008\n

    Certified safety for use in escalators in accordance with the European standard<\/p>\n<\/li>\n

  • Six nominal sensor frequencies available\n

    66\u2154, 80, 100, 250, 333 and 500 Hz – suitable for various gear ratios and cam numbers<\/p>\n<\/li>\n

  • Automatic self-test every time the device is switched on\n

    All four switch-off conditions are simulated internally – maximum operational safety<\/p>\n<\/li>\n

  • Four independent switch-off criteria\n

    Underspeed, overspeed, reversal of direction of rotation and sensor failure are reliably detected<\/p>\n<\/li>\n

  • Compact design with DIN rail mounting\n

    64 \u00d7 104 \u00d7 135 mm – easy installation in the switch cabinet, vertical or horizontal<\/p>\n<\/li>\n

  • Low power consumption under 5 VA\n

    Energy-efficient in continuous operation at 230 V AC<\/p>\n<\/li>\n

  • Integrated sensor supply 9 V DC\n

    No external voltage source required for the proximity switches – 2-wire (NAMUR) and 3-wire compatible<\/p>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"

    RC3 speed monitoring for escalators Why is the speed monitored on escalators? Speed monitoring is a safety-critical element in every escalator. According to the European standard EN 115:2008, escalators must be equipped with a reliable speed monitoring system that switches off the motor immediately in the event of dangerous speed deviations. An incorrect speed can […]<\/p>\n","protected":false},"featured_media":2832,"template":"","meta":{"_acf_changed":false},"product_brand":[],"product_cat":[617],"product_tag":[2454,2455,2456,2457,2458,2459,2460,2461],"class_list":{"0":"post-30871","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-rotational-speed-monitoring","7":"product_tag-drehzahluberwachung","8":"product_tag-en-115","9":"product_tag-fahrsteig","10":"product_tag-fahrtreppe","11":"product_tag-geschwindigkeitsuberwachung","12":"product_tag-namur","13":"product_tag-rc3","14":"product_tag-sensoruberwachung","15":"pa_einbaurichtung-horizontal-en","16":"pa_einbaurichtung-vertical","18":"first","19":"instock","20":"shipping-taxable","21":"purchasable","22":"product-type-variable"},"exclude_global_add_ons":[],"addons":[],"acf":[],"yoast_head":"\nSpeed monitoring RC3 for escalators | T\u00dcV-tested | RLS Wacon<\/title>\n<meta name=\"description\" content=\"RC3 speed monitor for escalator motors. 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