PTC FUNCTION for Delta C2000 and CP2000

Transcript

1 FUNCTION for Delta C2000 and CP2000 CONTENTS: GENERAL for motor temperature protection Standards Motor layout characteristic Definitions curve switching level input C2000/CP2000 PARAMETERS AND WIRING wiring and connection Recommendations and limitations Parameters for -function: Pr06.29 Pr06.30 and Pr03-00, Pr DIMENSIONING Connection diagram General formula Dimensioning R Conditions for R R value Conditions for Level Level Pr Reset Summary Circuit & wiring Parameter settings CLIXON Wiring for and connection of clixon Parameter settings... 9 Arnoud de Bok 2 January 204

2 GENERAL. for motor temperature protection To protect motors from overheating, s (also called thermistors) are incorporated in the motor windings. At the pre-defined temperature the s resistance suddenly increases. This can be measured. Especially when motors are used for long periods of time at low speeds, the cooling could be insufficient. In that case the motor can be equipped with optional s (ask the motor manufacturer)..2 Standards s for motor protection are manufactured acc. to the standards DIN4408 (for single s) and DIN44082 (for 3 s in series)..3 Motor layout A typical layout of the s in a motor is as follows, whereby the 3 s are connected in series. (In case of 6 s in series, each winding incorporates 2 s in series.).4 characteristic The characteristics of, 3 or 6 s is shown below. 6 s Resistance in Ω 3 s Temperature in C 2

3 .4. Definitions NAT Normal Excitation Temperature (German abbreviation) s are manufactured to switch at a certain temperature, called NAT..4.2 curve The curve for a single is defined as follows: Temperature range Resistance Measuring voltage -20 C to NAT-20 C 250Ω 2.5V NAT-5 C 550Ω 2.5V NAT+5 C 330Ω 2.5V NAT+5 C 4000Ω 7.5V.4.3 switching level switches between [NAT+5 C] and [NAT+5 C] 3 s in series switch between [NAT-5 C] and [NAT+5 C] 6 s in series switch between [NAT-20 C] and [NAT] As a user of AC Motor Drives, you don t have to worry about the value of NAT, this has been taken care of by the motor manufacturer. The standardisation of s ensures they switch at pre-defined resistance levels..4.4 input A -input should have the following functionality: R < 650Ω : 650Ω < R < 4000Ω : R >4000Ω : may not switch switch must have switched 3

4 2 C2000/CP2000 PARAMETERS AND WIRING Via a number of parameters the VFD-C and VFD-CP offer full flexibility to set the Motor Overheat Protection Level and the action when the protection level is reached. Refer to the VFD-C and VFD-CP User Manuals for an extensive description of the parameters. 2. wiring and connection The is connected to the AVI input as follows. Note: When used for, the AVI input cannot be used for frequency command. Note: For AUI and ACI, both in 0-0V, the procedure is the same. C2000/CP2000 VFD-E resistor-divider R +0V AVI 47kΩ 20kΩ ACM internal circuit 2.. Recommendations and limitations R U +0V AVI impedance 20kΩ 0.4.2V 20kΩ 2.2 Parameters for -function: Pr06.29 Pr06.30 and Pr03-00, Pr03-5 For extensive description of the parameters, please refer to the User Manual, Chapter 2. Parameter Description Range/Setting Unit Default Overheat treatment 0=Warn and keep running =Warn and ramp Sets the action when the Overheat Warning Level (P06.30) to stop 0 is reached. 2=Warn and coast to stop 3=No warning Level Sets the Alarm Level. The VFD-C displays blinking [PtC2]. Action acc. to P AVI function Selects the AVI function. Set 6 to select input. AVI Filter Time Selects the AVI filter time (in noisy environment) % 0.% 50.0% 0 7 n.a s 0.0 4

5 3 DIMENSIONING The following info can help you dimensioning the circuit and setting the parameters for s acc. to DIN4408/ Connection diagram Connect the as follows: C2000/CP2000 VFD-E resistor-divider R U +0V V AVI +0V AVI 47kΩ 20kΩ ACM internal circuit 3.2 General formula The general formula for calculating the voltage V AVI on AVI is (depending on R, U +0V and R ): V AVI R 20k = U + 0V [] R ( 20k + R ) + 20k R The general formula for calculating R (depending on V AVI, U +0V and R ): R U V + 0V = AVI R R 20k + 20k [2] 3.3 Dimensioning R Refer to.4.2 and Conditions for R At R 650Ω the input AVI may not have switched and the voltage must be ca. 2.5V. The worst-case condition is U +0V =.2V. From [2] follows k R = = 5304Ω k You can also refer to the following graph: 5

6 8 7 V in VDC R in Ohm U=0.4V AVI=2.5V U=.2V R value Select R=5600Ω ±0%. This is the nearest E2 value Conditions for Level At R 4000Ω the input AVI must have switched and the voltage must preferably be ca. 7.5V but this is neither mandatory nor critical. The display will show OH3. The worst-case condition is U +0V = 0.4V and R=5600Ω +0% (=660Ω) k From [2] follows V AVI = 0.4 = V k k 660 ( ) This can also be read from the following graph: 6

7 AVI in VDC Level Pr06-30 The Overheat Alarm level now can be set to 3.652V by setting Pr06-30=36.5%. Note: When the Level is reached, the drive will react acc. to Pr06-29 setting and display OH Reset When the motor temperature has decreased and the voltage level on AVI is lower than Pr06-30, the drive can be reset. Because there is no hysteresis, it is recommended to set a delay of 5-0s for the used analogue input (Pr03-5~Pr03-7). 3.5 Summary R in Ohm U=0.4 R=-0% U=0.4V U=0.4V R=+0% U=.2V R=-0% U=.2V U=.2V R=+0% V=3.652V 3.5. Circuit & wiring Please use shielded cable for connecting the. C2000/CP2000 R=5600Ω ±0% 20kΩ E 7

8 3.5.2 Parameter settings Parameter Description Range/Setting Unit Setting 03-00~ AVI, ACI, AUI function 0~7 6 * 03-5~ AVI Filter Time 03-7 Selects the AVI filter time (in noisy environment) s 5.00~0.00s Level % 0.% 50.0% 0=Warn and keep running Detection Selection =Warn and ramp User to stop selection 2=Warn and coast to stop 3=No warning * Set one analogue input for. ACI and AUI need to be set to 0-0V operation. Refer to the user manual. 8

9 4 CLIXON A clixon is a contact that opens at the specified temperature. They are sometimes used for motor protection. 4.. Wiring for and connection of clixon Use shielded cable to connect the clixon. R can also be 5k6 but this value is not critical. C2000/CP2000 R=5600Ω ±0% Clixon 20 E 4..2 Parameter settings Parameter Description Range/Setting Unit Setting 03-00~ AVI, ACI, AUI function 0~7 6 * 03-5~ AVI Filter Time 03-7 Selects the AVI filter time (in noisy environment) s 5.00~0.00s Level % 0.% 50.0% 0=Warn and keep running Detection Selection =Warn and ramp User to stop selection 2=Warn and coast to stop 3=No warning * Set one analogue input for. ACI and AUI need to be set to 0-0V operation. Refer to the user manual. 9