Power switching elements

• Power triacs
• Protection of triacs and opto-triacs against overvoltages by Transil diodes
• Transfer of the diagnostics information to the central interface module (CIM)

Control modes

Power output module POM4220 Lowend

• Half-wave control:
  This is the control type in normal operation. At every zero crossover, the output is controlled depending on the parameterized setpoint value. The controller outputs are set in values from 0 to 100%.

Power output module POM4220 Midrange

• Half-wave control:
  This is the control type in normal operation. At every zero crossover, the output is controlled depending on the parameterized setpoint value. The controller outputs are set in values from 0 to 100%.
• Soft start:
  Phase control is executed for a limited time in order to achieve a gradual warming of the heating elements (e.g. for shortwave infrared sources). Switches to half-wave control when the time has expired. The control variable is set to values between 0 and 100%.

Power output module POM4220 Midrange

• Half-wave control:
  This is the control type in normal operation. At every zero crossover, the output is controlled depending on the parameterized setpoint value. The control variable is set to values between 0 and 100%.
• Soft start:
  Phase control is executed for a limited time in order to achieve a gradual warming of the heating elements (e.g. for shortwave infrared sources). Switches to half-wave control when the time has expired. The control variable is set to values between 0 and 100%.
• Phase control:
  Phase control is executed permanently in order to achieve even heat dissipation and avoid disruptive emitter flickering with low setpoints. Phase control can sometimes cause EMC interference on the power supply lines which then has to be filtered on the system side.

Output power

Power output module POM4220 Lowend

• 16 power outputs of 230 V each (8 outputs per phase)
• Switching capacity per output: Max. 1449 W at 230 V.
  Caution: Short-wave halogen or infrared emitters, so-called flash emitters, have a high switch-on current due to their relatively low cold resistance. This switch-on current can be a multiple of the rated current especially during the initial half-waves. This can lead to the fuse being triggered. There is a limit to a switching power of 750 W when using flash emitters.
• Switching capacity per power output module: Max. 16100 W at 230 V

Power output module POM4220 Midrange

• 12 power outputs of 230 V/277 V each (6 outputs per phase)
• Switching power per output: max. 2760 W at 230 V or 3324 W at 277 V.
  Caution: Short-wave halogen or infrared emitters, so-called flash emitters, have a high switch-on current due to their relatively low cold resistance. This switch-on current can be a multiple of the rated current especially during the initial half-waves. This can lead to the fuse being triggered. There is a limit to a switching power of 1600 W when using flash emitters.
• Switching capacity per power output module: Max. 23 000 W at 230 V or 27 700 W at 277 V.

Power output module POM4220 Midrange phase control

• 12 power outputs of 230 V/277 V each (6 outputs per phase)
• Switching capacity per output: max. 3680 W at 230 V or 4432 W at 277 V.
  Caution: Short-wave halogen or infrared emitters, so-called flash emitters, have a high switch-on current due to their relatively low cold resistance. This switch-on current can be a multiple of the rated current especially during the initial half-waves. This can lead to the fuse being triggered. There is a limit to a switching power of 1600 W when using flash emitters.
• Switching capacity per power output module: max. 23,000 W at 230 V or 27,700 W at 277 V.

Ventilation

• A fan module can be optionally mounted at the top of the rack so that 4 POMs can be ventilated and controlled dependent on the internal temperature.

Temperature monitoring

• An NTC thermistor is installed in the device to monitor the internal temperature. An alarm threshold is defined for the internal temperature. The following reactions are triggered when the threshold is overshot:
• Signal to the higher-level controller.
• The outputs are deactivated - regardless of which output response was configured for the error.

Diagnostic options

Implicit diagnostics functions are provided as standard to detect the following faults (diagnostics cycle does not affect the heating power):

• Leading fuse defective / triac at high resistance (exception: setpoint 0%)
• Triac failure (exception: setpoint 100%)
• Heating element cable is defective (short-circuit and interruption)
• Load defective (short-circuit and interruption)