R&M Materials Handling ELECTRIC CHAIN HOISTS LoadMate Chain Hoist LM 10 Stepless - Manual (Page 47)

LM10 STEPLESS I&M MANUAL/EN/11.30.2010
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7.5.11 Speed supervision
Overspeed Monitor is a hoist motion speed supervision unit, which reads the pulse frequency from the hoist
motor sensor bearing (48ppr). This pulse frequency is compared with a fixed oscillator frequency. As a result
of frequency comparison, there are two different speed supervision functions :
• overspeed supervision (rush control)
• stall supervision
Overspeed supervision is totally implemented by hardware.
Switch S1 multiplies the overspeed detection frequency set by switch S2. There are 3 values available as
multiplier from switch S1. x0.5/x1/x2.
Switch S2 sets the detection frequency. Value can be selected stepless between values 1.5
and 3 kHz.
With switches S1 and S2 the overspeed detection frequency can be set between values 0.75
and 6 kHz.
Overspeed detection level should be set to 120% of nominal speed of motor.
Stall supervision stops the motion if there are no pulses coming from the sensor within set time after the
brake is open. Stall supervision time can be set with switch S3 between values 0.1 and 10 s. Time should be
set to value 1s, line between 0.1 and 2.
Led L1 indicates the state of incoming pulse. Green light means: pulse is down. Red light means :
pulse is up.
Led L2 indicates the state of output relay of Overspeed Monitor. Green led means: Hoisting is ok and relay
between terminals 11 and 14 is closed. Orange led means: Overspeed or stall fault is detected and relay
between terminals 11 and 14 is open