YASKAWA L1000A Quick Start Manual page 112

4 Start-Up Programming & Operation
■ Rescue Operation
In the event of a power outage, Rescue Operation allows the elevator to travel to the nearest floor by switching to a
backup battery or UPS (Uninterruptable Power Supply) for power.
An input terminal set for Rescue Operation (H1- = 55) can be used to initiate Rescue Operation. During Rescue
Operation, the drive uses the speed reference set in S4-15 to travel to the nearest floor.
NOTICE: Equipment Hazard. Do not use the Rescue Operation feature for extended periods. Failure to comply may result in drive heat
sink overtemperature alarms (oH).
NOTICE: When changing parameters while the drive is supplied from the rescue operation power supply, wait at least 5 s after entering
parameters before switching off the power supply. Instantly switching off the power can cause parameter settings corruption that can
only be resolved by initializing the drive. This may cause erroneous drive performance.
NOTICE: Always turn off the RUN command before changing the setting of parameters d1-18 (Speed Reference Selection Mode),
b1-01 (Speed Reference Selection), or H1- (Multi-Function Digital Inputs). If the RUN command is on when changing any of these
settings, the motor may unexpectedly start running, and could result in injury.
Drive Power Supply for Rescue Operation
There are various methods of supplying power to the drive for rescue operation. Independent of the chosen method, the
voltage in the DC bus of the drive and the voltage supplied to the drive control circuit must meet the specifications
provided in Table 33.
The DC bus voltage can either be supplied by a battery connected to the DC bus terminals of the drive or by a UPS
connected to drive terminals L1 and L2. The control circuit voltage can be supplied directly from the drives DC bus (no
external wiring required), from an external battery (connection to CN19), or by using an optional 24 Vdc control power
backup unit.
When using a single-phase AC power supply for rescue operation such as a single-phase UPS, the ripple in the DC bus
voltage will be higher than with a three-phase or battery supply. Make sure that the DC bus voltage never falls below the
minimum value listed in Table 33.
When using a PM motor with an incremental PG encoder and a PG-X3 option card, always perform Initial Magnet Pole
Search Parameters Auto-Tuning (T2-01 = 3) with the normal power supply connected. The tuning function will prepare
the drive for Rescue Operation by automatically setting certain parameters. If the tuning ends with an "End8" to "End10"
fault, then rescue operation will require a battery or UPS that supplies the drive DC bus with at least 280 Vdc for 200 V
class drives, 560 Vdc for 400 V class drives, and 700 Vdc for 600 V class drives. Alternatively utilize to an absolute PG
encoder and a PG-E3 or PG-F3 option card.
If the DC bus voltage is low, the overload protection level (oL2 fault detection level) will be reduced due to the low speed
run and the drive overload (oL2) will be triggered. If oL2 is detected, select the battery or UPS so that the output speed is
equal to or greater than 6 Hz.
The upper speed limit during rescue operation can be monitored by U4-40.
110 YASKAWA ELECTRIC TOEP C710616 38H YASKAWA AC Drive-L1000A Quick Start Guide