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LRV-1 lift control valve
4 Installation and commissioning
47/86
300-I-9010050-E-28/02.2012
4.2.4
Electrical emergency-lowering 2 x 24 VDC
Note:
The operator must undertake any further measures required to
ensure short-circuit and overvoltage protection.
If a mains (line) failure occurs, the power supply unit can be powered by
an external battery supply (2 x 24 V) through terminals 12, 19 and 20.
S
Relay R
N
drops out when there is a power failure and the two
normally-closed relays connect to the battery.
I
Inputs 19 and 20 have diode-protection from polarity reversal or
feedback to the battery.
S
The lift can be lowered to a predefined stopping position by means of
”Slow DOWN” or auxiliary speed K6…K8 (travel signals are
generated by the lift control system or by a push-button switch).
Note:
only possible with 2 x 24V (or 4 x 12V) batteries
4
Slow DOWN
Auxiliary speed
K6/K7/K8 21/22/23
Legend
1
NTA‐2 power supply unit
2
Supplied by customer
3
DOWN solenoid