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Elevator Core Reference Guide

Battery Supply Drive Operation

Rescue Mode Activation and Running Conditions with Battery Supply

Conditions to Activate Rescue Mode with a Battery Supply

Rescue_Mode_-_Battery_-_Entering_Rescue_Mode_with_a_Battery_Supply_-_Activating_Rescue_Mode.svg

Warning

Before Entering Rescue Mode the user must ensure that the UPS has been installed in accordance with the information in the Topic: Battery Supply Connection.

To switch into Rescue Mode the drive must be stopped.

Note

If the drive is running and the Rescue Mode Digital Input is closed then on the next stop the drive will go into rescue mode.

The drive does not need to be in a healthy state for Rescue Mode to be activated a fault can be present.

The Digital Input terminal (DI8 or DI3 depending on the setting of P1-02) that is used to activate Rescue Mode must have an external voltage supply of at least 18Vdc to activate Rescue Mode.

For battery mode P7-01 must be set to setting 2: bAtt or the drive will be stuck in an Under-voltage condition.

From default Digital Input 8 is assigned to be Rescue Mode Enable, if a different setting of Macro is used in P1-02 then a different terminal maybe used, or if you are using Macro 0 the Rescue Mode function can be assigned to any Digital Input via Group 12 and selecting option 8: Rescue Mode.Group 1 User IO - Parameter List

Digital/Relay Outputs can be used to indicate if the drive is operating in rescue mode by setting the Digital/Relay Function to 9 (Rescue Mode Active).

Conditions to Run the Drive in Battery Mode

Rescue Mode Running Conditions in Battery Mode

Rescue_Mode_-_Battery_-_Battery_Mode_Activation_and_Running_Conditions-_Conditions_to_Run_the_Drive.svg

Each of the following conditions must be met for the drive to run in Rescue Operation with a battery supply (P7-01 = 2: bAtt):

  1. An external 24Vdc must be supplied to the Control terminals (+24V) with respect to (0V) or the drive will not be able to switch into Rescue Mode.

  2. Rescue Mode Enable Input must be on and confirmed as active.

    Note

    You can check if the drive is in Rescue Mode in P7-15.

    When P7-15 = 1 the drive is in Rescue Mode.

  3. A Direction command from a Digital Input is closed

  4. The Drive is in a Healthy state

  5. Safety Chain closed to both STO1 and STO2 with 24Vdc applied (The status of the STO inputs can be viewed in P0-03 = 1).

Note

A Speed Reference or Enable Digital Input is not needed in Rescue Mode

UPS Protection Function

When using a UPS supply there are two different protection functions to prevent damage to the UPS or excessive draw on the UPS. These are Power limit and Current limit, each function is detailed in the sections below.

UPS Protection - Power

The drive can be used to protect the external UPS unit. By using P7-04 and P7-16 to set the UPS power rating and overload time respectively the drive can protect the UPS from collapsing/overloading.

The function works by:

  1. Set UPS power rating (in kW) in P7-04 and Overload time limit in P7-16.

    Important

    If P7-04 is set to 0 then this function is disabled.

  2. When the drive is run in rescue mode if the value in P0-30 exceeds the value set in P7-04 for the total time in P7-16 the drive will trip UPS-L and immediately stop.

    Important

    The time in P7-16 is total cumulative time during running not consecutive time.

    For example if the time in P7-04 is set at 2 seconds. When the drive is run and P0-30 is > P7-04 for 1 second then is below P7-04 for 2 seconds then above P7-04 again for 1 second the drive will trip as the total cumulative time has reached the 2 seconds set in P7-04.

  3. To restart the drive the fault will need to be cleared and a new direction command issued.

UPS Protection Power Function - Timing Diagram

UPS_Protection_Function_Power_-_Timing_Diagram.svg

UPS Protection Power Function - Example Scope Traces

UPS_Protection_Function_Power_-_Scope_Trace.svg
UPS Protection - Current

The current limit during operation can be set in P7-05. This parameter limits the current operation while running in rescue mode to a percentage of P4-06 (Motor Rated Current), with 100% (default) being the value of P4-06.

Note

P7-05 value is only active in Rescue Mode.

UPS Protection Parameters

Parameter Number

Parameter Name

Units

Default

Available Settings

Access

Change During Run

Scaling

Size (Bytes)

CAN Register

CAN Sub Index

Modbus Register

P7-04

UPS Rating

kW

0.0kW

0.0 ... 65535kW

RW

Y

1 = 0.1kW

2

22C0h

0

704

P7-05

Rescue Mode Current Limit

%

100.0%

0.0 ... 200.0%

RW

Y

1 = 0.1%

2

22C1h

0

705

P7-16

UPS overload time limit

sec

2.0s

0.0 ... 10.0s

RW

N

1 = 0.1s

1

22CCh

0

716

P7-04 - UPS Rating

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

Sets the current limit during rescue mode operation. If the drive current exceeds this value then the speed will be reduced until the current level falls below this value.

P7-16 - UPS overload time limit

Used in conjunction with parameter P7-04 (UPS rating).

When the value in P7-04 is exceeded for the cumulative time set in this parameter the drive will trip UPS-L.

Note

If P7-04 = 0 UPS Protection is disabled and the time in this parameter is not used.

In this section: