Delta EB3000 Series User Manual page 272

04-52
PTC Detection Filter Time

VF
Control Mode
Settings
 See Parameter Group 01 Analog Input / Output Settings for details.
04-53
Electronic Thermal Relay
VF
Control Mode
Settings
 Prevents self-cooled motor from overheating at low speeds. You can use an electrical thermal
relay to limit the drive's output power.
 Setting the parameter to 0 is suitable for standard motor (motor fan is fixed on the rotor shaft).
For this kind of motor, the cooling capacity is lower in low speed; therefore, the action of an
electronic thermal relay reduces the action time to ensure the life of motor.
 Setting the parameter to 1 is suitable for an inverter motor (motor fan using an independent
power supply). For this kind of motor, there is no significant correlation between cooling capacity
and motor speed. Therefore, the action of electronic thermal relays remains stable in low speed
to ensure the load capability of the motor in low speed.
 When the power is cycled frequently, if the power is switched OFF, the electronic thermal relay
protection is reset; therefore even setting the parameter to 0 or 1 may not protect the motor
well.
04-54
Electronic Thermal Characteristic

VF
Control Mode
Settings
 Set the parameter to 150% of motor rated current and use with the setting of Pr.04-54 to
prevent motor damage due to overheating. When it reaches the setting, the drive displays fault
code EoL1, and the motor coasts to stop.
 Use this parameter to set the action time of the electronic thermal relay. It works based on the
I t characteristic curve of electronic thermal relay, the output frequency and current of the drive,
2
and the operation time to prevent the motor from overheating.
Standard motor
SVC FOCPG
0.00–10.00 sec.
SVC FOCPG
0: Standard motor (motor with fan on the shaft)
1: Inverter motor (with external forced cooling)
2: Disabled
SVC FOCPG
30.0–600.0 sec.
Chapter 8 Descriptions of Parameter SettingsEB3000
FOCPM
FOCPM
FOCPM
Inverter motor
8-04-9
Default: 0.20
Default: 2
Default: 60.0