Trane TR200 Programming Manual page 19

Introduction
it necessary to ensure that no unintended start occurs, these stop functions are not sufficient. In such cases,
the line power supply must be disconnected or the
2. The motor may start while setting the parameters. If this means that personal safety may be compromised
(e.g., personal injury caused by contact with moving machine parts), motor starting must be prevented, for
instance by use of the
3. A motor that has been stopped with the line power supply connected, may start if faults occur in the elec-
tronics of the adjustable frequency drive, through temporary overload or if a fault in the power supply grid
or motor connection is remedied. If unintended start must be prevented for personal safety reasons (e.g.,
risk of injury caused by contact with moving machine parts), the normal stop functions of the adjustable
frequency drive are not sufficient. In such cases, the line power supply must be disconnected or the
Stop
function must be activated.
NOTE
Safe Stop
When using the function, always follow the instructions in the
4. Control signals from, or internally within, the adjustable frequency drive may in rare cases be activated in
error, be delayed or fail to occur entirely. When used in situations where safety is critical, e.g., when con-
trolling the electromagnetic brake function of a hoist application, these control signals must not be relied
on exclusively.
WARNING
Touching the electrical parts may be fatal - even after the equipment has been disconnected from line power.
Also make sure that other voltage inputs have been disconnected, such as external 24 V DC, load sharing (linkage
of DC intermediate circuit), as well as the motor connection for kinetic backup.
Systems where adjustable frequency drives are installed must, if necessary, be equipped with additional mon-
itoring and protective devices according to the valid safety regulations, e.g., law on mechanical tools, regulations
for the prevention of accidents, etc. Modifications on the adjustable frequency drives by means of the operating
software are allowed.
Hoisting applications:
The adjustable frequency drive functions for controlling mechanical brakes cannot be considered as a primary
safety circuit. There must always be a redundancy for controlling external brakes.
Protection Mode
Once a hardware limit on motor current or DC link voltage is exceeded, the drive will enter "Protection mode".
"Protection mode" means a change of the PWM modulation strategy and a low switching frequency to minimize
losses. This continues 10 sec after the last fault and increases the reliability and the robustness of the drive while
re-establishing full control of the motor.
In hoist applications, "Protection mode" is not usable because the drive will usually not be able to leave this
mode again, and therefore it will extend the time before activating the brake – which is not recommended.
"Protection mode" can be disabled by setting par.14-26
the drive will trip immediately if one of the hardware limits is exceeded.
NOTE
It is recommended to disable protection mode in hoisting applications (par.14-26
2-8
Safe Stop
function or secure disconnection of the motor connection.
Safe Stop
function must be activated.
Safe Stop
section of the Design Guide.
Trip Delay at Inverter Fault
Trip Delay at Inverter Fault
Safe
to zero, which means that
= 0)
TR200 Programming Guide