Toshiba Remote Starter ME00070B Manuale Utente

TMS7 SERIES 

ME00070B 

19 

Adjustment: Function 3 Minimum Current and Function 4 Start 

Ramp Time are used together to activate and control the Ramp 
Start mode. 
If the Ramp Start mode is required, set the Minimum Current so 
that the motor begins to accelerate immediately a start is 

initiated. Ramp Start mode is not required, set the Minimum 
Current equal to the Current Limit. 
Ramp Start mode should be considered in preference to Current 
Limit start mode in applications where: 

• 

Required start torque can vary from start to start. For 
example conveyors may start loaded or unloaded. In this 

case set Function 3 Minimum Current to a level that will 
start motor in the light load condition and Function 2 

Current Limit to a level that will start the motor in the high 
load condition. 

• 

Starting time of an easily broken away load needs to be 
extended, for example pumps. 

• 

A generator set supply is limited and a slower application 

of load will allow greater time for the generator set to 
respond. 

 

Range: 1 – 30 Seconds 
Default Setting: 1 Second 
Description: Sets the ramp time for the Current Ramp start 

mode. 
Adjustment: Set the Start Ramp Time to optimise start 

performance. 
 

Range: 0 – 100 Seconds 
Default Setting: 0 Second (Off) 
Description: Sets the soft stop ramp time for soft stopping of 

the motor. 
Adjustment: Set the Stop Ramp Time to produce the desired 

motor stopping performance. 
Two soft stop modes are provided by the TMS7. Use Function 
10. Soft Stop Mode to select the desired mode. 
If utilising the Soft Stop function and a line contactor, the 

contactor must not be opened until the end of the stop ramp 
time. The TMS7 programmable outputs A,B or C can be set for 

control of the line contactor. Refer Functions 21, 22, 23 for 
programmable output assignment details. 
 

Range: 0 – 60 Seconds 
Default Setting: 10 Seconds 

 

NOTE: 
A setting of 0 seconds disables the TMS7 motor 

thermal model. Use this setting only if another form 
of motor protection is used. 

Description: Sets the motor thermal capacity used by the TMS7 

motor thermal model. 
Adjustment: Set the Motor Trip Class (MTC) according to the 
motor’s thermal capacity. 
A motor’s thermal capacity is expressed as the maximum time 

(seconds) a motor can maintain locked rotor current conditions 
from cold, and is often referred to as Maximum Locked Rotor 

Time or Maximum DOL Start Time. This information is available 

from the motor data sheet or direct from the motor supplier. 

 

NOTE: 
The TMS7 motor thermal model assumes a 

locked rotor current of 600%. If the connected 
motor’s locked rotor current differs from this, 

greater accuracy can be achieved by using a 
normalised MTC figure. A normalised MTC 
figure can be calculated as follows: 

Time

 

Start

Max 

 

X

2

600

%LRC

 

=

 

MTC













 

 

NOTE: 
Setting Function 6 Motor Trip Class according 
to the motor’s actual thermal capacity allows 

safe use of the motor’s full overload capability 
both to start the load and ride through overload 

conditions. Additionally, a more conservative 
approach can be taken by setting a reduced 

MTC for easy to start loads that will not 
experience transient operating overloads as a 

part of normal operation. 
Using a reduced MTC figure has the advantage 

of maximising motor life. The life of a motor is 
strongly influenced by its maximum winding 

temperature, with a 'rule of thumb' stating that 
the expected life span of a motor is halved for 

every ten degree rise in temperature. The 
temperature rise is dependent on the motor 
losses and the motor cooling. The highest 

stress on the motor is during start, and can be 
minimised by restricting the duration and 

frequency of starts. A reduced MTC setting 
(Function 6) will also cause the TMS7 

protection to operate before the motor is 
thermally stressed. 
A suitable reduced MTC figure can be 
established by observing the modeled motor 

temperature as shown on the TMS7 LED 
display, and adjusting the MTC parameter such 

that after a normal start which has been 
preceded by a period of running at maximum 
load, the calculated motor temperature is 

approaching 90%. 

1

10

100

1000

10000

100

300

500

700

MTC = 5 Sec

MTC = 10 Sec

MTC = 20 Sec

MTC = 30 Sec