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D877 MGB Rev01 HE250.docx
3 Protection against the uncontrolled movement of the cabin (UCM)
3.1
Introduction
The valve unit is a part of the protective device against the uncontrolled movement of the lift, with the door not
locked up or with the door open cabin, provided for in section 5.6.7 della norma EN 81.20.
The device must detect the uncontrolled movement of the lift, cause it to stop, and keep it still.
The valve unit is the stop element, downhill, provided as a subsystem in point 5.8.1 of the standard EN 81.50.
The protection against uncontrolled movement must act, uphill, interrupting the electrical supply of the motor
pump, while, in descent, OMARLIFT involved the use of a system formed by two electrically controlled valves
and the hydraulic block (ENR solenoid valves and ERS) operating in series, that participate in the normal
operation of the lift.
It is expected, for this type of device, a self-monitoring by the electrical panel, according to point 5.6.7.3 of the
EN 81-20.
To execure the self-control of redundant descent devices, the electrical panel can operate in two modes:
-
Functional, operating periodically, automatically, the two valves for leaks (see section 3.4)
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Checking the supplied tracking signal from the electronic board of the valve group (see section 3.6).
When the circuit required in section 5.6.7.7 of the EN 81-20 identifies uncontrolled movements of the cabin
doors open, it must activate the stop element, interrupting any signal and command to the valve group. In
particular, must be disconnected, on SCH001 electronic card, the inputs of ENR solenoid valves and ERS on
the M2 terminal block, and in any case we have to stop the input signals to the card, the CN6-7 connector.
The The device must be actuated (interruption of the input signals), before the cab moves away 200 mm from
the floor. There shall be a test of the device in accordance with section 6.3.13 of the EN81-20 (see point 1.0).
When the device is activated or self-control redundancy has indicated a fault in the arrest element of the device,
as required in section 5.6.7.9 of the EN81-20 standard, its release or the lift recovery must be checked by a
competent person.
3.2
Schedule of operation signals and controls
MPP
VSC Valve Command Stepper Motor
D-MPP Stepper Motor Control Driver
RM
Stepper Motor Connection Relay
A1-A2 Stepper Motor A Phase
B1-B2 Stepper Motor B Phase
CN1-5 Board sensor connections
CN6-8 Board Signals Input Connections
CN9-16 Board Signals Output Connections
CN20
Board MPP motor connection
EN81-20 DOWNWARD Downward Command Devices
EN81-20 TRAVEL Upward And Downward Command Device
M1
Board Input Connection
M2
Solenoid Valves Input Connection
M3
Solenoid Valves Connection
V-ENR ENR Voltage Input Control
V-ERS ERS Voltage Input Control
A-ENR ENR Current Output Control
A-ERS ERS Current Output Control
ENR
VNR Valve Unblock Solenoid Valve
ERS
VSC Valve Unblock Solenoid Valve
ZERO VSC Valve Position Sensor
TF
Flow Sensor
TP1
Pressure Sensor
TT
Temperature Sensor
