M3 - M3 Input; M4 - M4 Terminal; N - Neutral Terminal; Ndg - Nudging Buzzer Output - ECD 100-194 EN81 Manual

I N P U T S – O U T P U T S
M1 terminal is provided for testing purposes and for the Door Open relay supply for dual door circuits.
M3 – M3 Input
Re-levelling circuit, CG relay and CGBP relay contact internal monitoring point
M3 input turns on when either the internal contacts of LCK2 relay or L2BP relay in the safety circuit are closed or
when the re-levelling circuit in the safety circuit is closed
M3 input turns on M3 LED
See also Inputs – Outputs LCK2 relay, L2BP relay
See also LCD status – "L2C"
M4 – M4 terminal
M4 terminal is provided for wiring and testing purposes and connects the neutral side of circuits to controller
terminal 44
Connect M4 terminal to N terminal
For Rev 1.02 boards onwards, M4 to N link not required (done internally)
N – Neutral terminal
Safety Circuit AC return line
Connect N terminal to M4 terminal

NDG - NuDGing buzzer output

Darlington output
NDG output turns on to operate a door nudging buzzer to indicate doors are closing on nudging speed
NDG output turns on to activate an audible signal when lift on HFS recall
NDG output turns on to operate an audible floor passing tone device
See also Inputs – Outputs, NR
See also EEPROM settings, NR

NR - Nudging Relay output

NR relay pulls up when the lift is on door nudging mode
In door nudging mode, the doors will close regardless of "EDP" input state. The NR relay contacts are used to
signal the door operator to close the doors at a reduced speed and torque to avoid injury
Nudging mode occurs when doors are held open via EDP for more than 20 seconds after door timing (DTC,
DTH, DTL) has expired
Lift must be in NOR mode (normal operation) for nudging to operate
See also Inputs – Outputs, NDG
See also EEPROM settings, NR
OIL – OIL overheat input
Hydraulic lifts only
OIL input turns on when the hydraulic motor and/or oil design temperature is exceeded
"Hyd. OIL overheat" shall be shown on the LCD screen
Car shall stop directly and return to the bottom landing and open the doors to evacuate passengers. Doors will then
close and lift shall remain out of service until OIL turns off. Door open button shall remain operative
Re-levelling shall be disabled with OIL input on.
OS output shall turn on
See also Inputs - Outputs, OS

OS - Out of Service output

Transistor Output
OS output turns on whenever the lift is out of the group. Hall calls shall be cancelled
Used for driving an external relay, or as an input for displays notifying the lift is Out Of Service
There are numerous conditions which shall turn OS output on, for example, when safeties are lost, lift is not in
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