Motor Overload Protection Selection (Sn-23); Motor Overload Protection Curve (Cn-09 Setting = 100%); Frequency Characteristics Command Selection At External Analog Input Terminal (Sn-24) - TECO speecon 7200ma Instruction Manual

(23) Motor Overload Protection Selection (Sn-23)

Sn-23 = 0: Electronic overload protection disable.
Sn-23 = 1~4 : Electronic overload protection enabled. The electronic thermal
Sn-23 = 1 :The overload is detected according to the standard motor cold start curve.
= 2 : The overload is detected according to the standard motor hot start curve.
= 3 : The overload is detected according to the specific motor cold start curve.
= 4 : The overload is detected according to the specific motor hot start curve.
• Disable the motor protection function (setting 0) when 2 or more motors are
connected to a single inverter. Use another method to provide overload protection
separately to each motor, such as connecting a thermal overload relay to the power
line of each motor.
• The motor overload protection function should be set as Sn-23= 2 or 4 (hot start
protection characteristic curve) when the power supply is turned on or off frequently,
because the thermal values is reset each time when the power is turned off.
• For the motor without forced cooling fan, the heat dissipation capability is lower
when in the low speed operation. The setting Sn-23 can be either '1' or '2'.
• For the motor with forced cooling fan, the heat dissipation capability is not
dependent upon the rotating speed. The setting Sn-23 can be either '3' or '4'.
• To protect the motor from overload by use of electronic overload protection, be
sure to set the parameter Cn-09 according to the rated current value shown on the
motor nameplate.
Fig. 37 Motor overload protection curve (Cn-09 setting = 100%)

(24) Frequency Characteristics Command Selection at External Analog Input Terminal (Sn-24)

Sn-24 = 0 : Frequency command is input at VIN terminal (0~10V)
= 1 : Frequency command is input at AIN terminal (4~20mA)
= 2 : Frequency command is the addition (VIN + AIN) at VIN (0~10V) and
AIN (4~20mA) terminal.
= 3 : Frequency command is the combination (VIN - AIN) at VIN (0~10V)
and AIN (4~20mA) terminal. If the value (VIN - AIN) is negative, the
reference command will take '0' as a result.
overload is detected according to the characteristic curves of
protection operating time. vs. motor rated current setting (Cn-09).
Low Speed
(<60 Hz)
5.5
3.5
100% 150% 200%
High Speed
(>60 Hz)
Cold Start
Hot Start
Motor Load Current (%)
(Cn-09 = 100%)
78