Rescue Operation

Rescue operation is normally used in the event of a mains borne power failure, with the primary goal of moving the elevator car at a limited motor speed for passenger evacuation, the power source comes from either DC (Batteries) or a UPS power supply as defined by the setting of P7-01 and with wiring in accordance with the connection diagrams shown below.

Par	Parameter Name		Minimum	Maximum	Default	Units
P7-01	Rescue Supply Type		0	2	0	-
	Select what type of power supply is being used for Rescue Mode Operation
	Setting	Power Supply
	UPS230	230VAC 1ph UPS
	UPS400	400VAC 2ph UPS
	bAtt	Battery Operation

Rescue operation with a UPS

UPS power supply requirements

Nominal Rating

Minimum Voltage

Maximum Voltage

VA Rating

230VAC 1Ph

160VAC (226Vdc)

280VAC

>= 230 x Motor Rated Current P4-03

Typical UPS ratings

Drive Rating	UPS Rating

UPS power supply connection method

*Required Contactor Sequencing

The Rescue Supply Contactor must only be closed when the Main Contactor is open (Interlocking Mechanism)
A delay time of no less than 5 sec’s must be included when changing over to/from UPS supply to/From mains supply mode.
The Main Supply Contactor and Rescue Supply Contactor must be interlocked so that both cannot be energised at the same time, failure to do so may result in damage to the UPS and/or contactor.
The drive will always wait until the next stop command (Direction input removal) before rescue mode operation is activated and likewise when rescue mode is de-activated the drive will wait until the next stop command before changing back to normal mains supply operation.

Note : Circuit protection must be provided.

Activating UPS Rescue mode

The drive will only run when a direction command is given.

Direction of travel can be shown on the display by pressing the image17.emf button, it is assumed that when a Run up (Forward) command is given the motor rotates clockwise (looking at the motor with the sheave facing you).

Rescue operation with Batteries

Battery supply requirements

Supply	Minimum Voltage Range	Nominal Battery Voltage	Maximum Battery Voltage	Current requirement
Main Voltage Input (+/-DC terminals)	32Vdc (<24Vdc will result in an undervoltage trip)	48Vdc	Rated DC voltage	Motor Rated current (P4-03) and considering overload, typically no greater than 200%
Control Voltage Input (+24V terminals)	20V	24V	26V	2.2A (60W)

Supply

Minimum Voltage Range

Nominal Battery Voltage

Maximum Battery Voltage

Current

requirement

Main Voltage Input (+/-DC terminals)

32Vdc (<24Vdc will result in an undervoltage trip)

48Vdc

Rated DC voltage

Motor Rated current (P4-03) and considering overload, typically no greater than 200%

Control Voltage Input

(+24V terminals)

20V

24V

26V

2.2A (60W)

Battery power supply connection method

Wiring Diagram for battery connection

*Required Contactor Sequencing

The Rescue Supply Contactor must only be closed when the Main Contactor is open.
A delay time of no less than 5 sec’s must be included when changing over to/from Rescue supply to/From mains supply mode.
The Main Supply Contactor and Rescue Supply Contactor must be interlocked so that both cannot be energised at the same time, failure to do so may result in damage to the Battery and/or contactor.
The Battery must have a reverse power protection diode fitted as shown in the diagram opposite.
The protection diode must have a voltage rating of at least 1000V and with a current rating of 2 x drive rated current
The drive will always wait until the next stop command (Direction input removal) before rescue mode operation is activated and likewise when rescue mode is de-activated the drive will wait until the next stop command before changing back to normal mains supply operation.

Note : Circuit protection must be provided.

Activating Battery Rescue mode

The drive will only run when a direction command is given.

Par

Parameter Name

Minimum

Maximum

Default

Units

Visibility Modes

Accessibility

P7-02

Rescue Operation Mode

There are 3 types of rescue mode operation, the following points of consideration help select the most suitable mode:

If the controller is to choose the direction of travel, then mode 0 should be used.
Mode 1 and 2 lets the drive measure which is the easiest direction of travel and consumes the least amount of energy from the UPS/Battery.

Basic Rescue Mode

When Rescue mode is enabled the travel Direction is governed by the direction command given to the drive from the controller, the travel Speed is defined by the rescue mode speed parameter P7-03. Limited by UPS limit value set in parameter P7-04.

Light Load Detection

In this Mode the drive runs the motor in both directions (upward first) at a limited speed (P7-09) and limited time (P7-08) to measure which travel direction is the easiest as illustrated in the diagram below:

Note : Upward direction (motor clockwise with sheave facing you).

UPS Easiest Direction based on Load Measurement

In this Mode the drive measures and stores the load during each brake release, this value is then used to determine the easiest direction when rescue mode is next activated.

Reserved

P7-03

Rescue Mode Speed

0.0

P8-01

5.0Hz

Hz/rpm/Linear

All

R/W

This parameter defines the motor speed during rescue mode operation (when Rescue mode Input is activated), the value is also controlled internally by the power limit function based on the UPS rating entered into parameter P7-04.

The actual achievable speed will be limited depending on a number of factors such as DC bus voltage level, motor, travel speed, system efficiencies, estimated value can be calculated as follows :

Rescue Mode Speed Limit = DC Bus Voltage (P0-47) x Motor Rated Frequency (P4-04)

1.7 X Motor Rated Voltage (P4-02)

It should also be noted that the level of motor load will affect the available DC bus Voltage; in some cases it may be necessary to reduce the Rescue Speed further in order to prevent nuisance Under Voltage (“”) trips. Vs P7-04?

what about battery ?

P7-04

UPS Rating

0.0

100.00

Drive Rated power/8

All

R/W

Used to protect overloading/ collapsing of voltage of the UPS power supply which could cause a motor stall condition.

When the output power to the motor exceeds this value for the time set in parameter (P7-16) UPS Overload Time Limit, the drive will ramp down to Stop, apply brakes (if controlled by the drive) and trip on “UPS-L”, to restart a new direction command will need to be provided by the controller.

If value is set to 0.0 then this function is disabled.

P7-05

Rescue Mode Current Limit

0.0

200.0

100.0

All

R/W

Set the current limit during rescue mode operation.

P7-06

Rescue Mode Proportional Speed Loop Gain

0.0

400

10.0

All

R/W

P7-07

Rescue Mode Integral Speed Loop Gain

1000

All

R/W

Rescue mode Gains improve speed stability during rescue operation.

Par	Parameter Name	Minimum			Maximum	Default		Units			Visibility Modes	Accessibility
P7-08	Light Load Detection Measurement time	0.0			10.0	1.0		s			All	R/W
	This parameter determines the time in which the light load detection function runs at the speed set in P7-10 (Light Load Speed Detection Speed) in each direction.
P7-09	Light Load Detection Speed	0.00			P8-01	5.00Hz		Hz/rpm/Linear			All	R/W
	This parameter determines the motor speed in which the light load detection function runs at.
P7-10	Load Measurement extended time	0.0			10.0	0.0		s			All	R/W
	Increasing this value can help improve the measurement accuracy of the light load detection feature.
P7-11	Light Load Detection Result	0			2	0		-			All	RO
	This parameter shows the result of the light load detection function test. P7-02=1 and P7-02 =2 0 = Light direction is clockwise 1 = Light direction is Anti-clockwise 2 = Balanced
P7-12	Energy Saving Rescue Unbalancing Maximum Speed	0.00			TBC	5.00		Hz/rpm/Linear			All	R/W

P7-13	Energy Saving Rescue Minimum Speed	0.00			TBC	5.00		Hz/rpm/Linear			All	R/W

P7-14	Energy Saving Rescue Minimum Speed time	0.0			TBC	0.0		s			All	R/W

P7-15	Active Supply		0	1			0		-	All			RO
	Displays the active supply that the drive is being operated from. 0 = Mains Supply 1 = Rescue Supply
P7-16	UPS Overload Time Limit		0	10.0			2.0		s	All			R/W
	Used in conjunction with parameter P7-04 (UPS rating)

Rescue Operation indicators

When the drive is operating in rescue operation the drive can indicate that rescue operation is active using the following methods:

Keypad display will show direction of travel “Up" or "Dn”.
Read Only parameter P7-15 (Active Supply) will show that rescue mode is active
Any of the digital or relay outputs set as function 9 can be used to indicate when Rescue Mode is active.
Any of the digital or relay outputs set as function 17 can be used to indicate the result of the light load detection measurement.

Functions disabled/Different in Rescue Operation

When the drive is operating in rescue mode the following functions will automatically be disabled/modified.

Input Phase Loss detection is disabled.
DC bus Ripple detection is disabled.
Reduced Undervoltage trip levels in accordance with the voltage supply Range as detailed in section 15.11.1.1 and 15.11.2.1.
S- Ramps/Jerks are not used during travel.
Motor brake control operates as per normal mains borne supply operation.
Dedicated speed loop gains (P7-06 Rescue Mode P-Gain and P7-07 Rescue Mode I-Gain) will be available as generally the gain is much lower to allow for a softer start for less of a surge on the UPS/Battery output.
Motor Auto-tune or Encoder offset (P4-08>0) are not permitted when operating in Rescue Operation

In this section:

Elevator Core Reference Guide