Brushless motor with ESC does not work anymore

Other Hardware Motors, Mechanics, Power and CNC
7

Thanks for the advice. That is the magic word "writemicroseconds".
With "1" means that the right rotor:
With "2" means that the left rotor:

#include <Servo.h>

Servo motorCW1;
Servo motorCW2;

#define PIN_CW1	5
#define PIN_CW2	6

void esc()
{
  delay(5000);
  Serial.println("Sending lowest throttle CW1");
  motorCW1.writeMicroseconds(1000);
  delay(2000);
  Serial.println("Sending lowest throttle CW2");
  motorCW2.writeMicroseconds(1000);
  delay(2000);
  Serial.println("Low throttle sent");
}

void setup() {
  Serial.begin(9600);
  motorCW1.attach(PIN_CW1);
  motorCW2.attach(PIN_CW2);
  Serial.println("ESC calibration started"); 
  esc();
  Serial.println("ESC calibration completed");
}

void loop() {

  if (Serial.available() > 0)
  {
    int key = Serial.read();
    switch(key) 
	{
      case '1':
      motorCW1.writeMicroseconds(1050);	
//	  motorCW2.writeMicroseconds(1050);
	  Serial.println("1050");
      delay(2000);
      break;
      case '2':
//      motorCW1.writeMicroseconds(1100);
	  motorCW2.writeMicroseconds(1100);
	  Serial.println("1100");
      delay(2000);
      break;
	  case '6':
      motorCW1.writeMicroseconds(1000);
      motorCW1.writeMicroseconds(1000);
	  	  Serial.println("1000");
      delay(1000);
      break;

      default:
      motorCW1.writeMicroseconds(1000);
      motorCW2.writeMicroseconds(1000);
	  	  Serial.println("1000");
      break;
    }
  }
}

If I turn in "Case 1" CW2, the rotors spin very fast. Why is that?
Regards Kucky