3.4 Special Functions
3.4.1 Low-overshoot charging of capacitors
For devices with the CLD option, the internal set value of the output voltage is immediately set to the externally set value after
activation of the HV generation. A capacitor connected to the output of the device is charged with the set current up to the
specified value of the output voltage.
To minimize the output voltage overshoot, there is a comparator in addition to the voltage control loop, which blocks the HV
generation when the output voltage exceeds the set voltage by about 0.5% • V
nom
.
3.4.2 Interlock EPS 150W
Optionally the power supply can be equipped with an interlock, a hardware safety loop. The connector “IL” (maximum cross
section area 1.5mm²) is installed on the front side.
If the loop is closed an internal current source ( open circuit voltage 24 V / short circuit current max. 25 mA) will drive a current of
ca. 12 mA through a built-in mechanical relays (certified in accordance with IEC/EN 60950 and UL 60950, fulfills the Telcordia
requirements according GR 1089 and FCC part 68).
The impedance of the closed loop must be less than 300 Ohm.
If the safety loop is open (Impedance > 100 kOhm), the relays will open. The high voltage generation is stopped only by the
opened relay contacts. The relay locks the gate pulses of the semiconductors of the inverter.
It is not possible to switch on the high voltage generation if the safety loop is open.
The state of the opened safety loop is handled as an error. For the release of the high-voltage generating the error register must
be reset after closing the safety loop. (see section 3.4.4 INHIBIT)
INFORMATION
INFORMATION
The high voltage cannot be switched on when the safety loop is open.
3.4.3 Ramp
After activating the HV generation, the internal set value of the voltage is increased from zero to the set value with the ramp
speed depending on the configuration. If the set current is not reached or exceeded, the output voltage follows this set value
ramp. When switching off the HV generation there are 2 cases:
Switching off with ON:
The internal set value of the voltage is decreased from the set value to zero with the ramp speed
depending on the configuration
Switching off with INHIBIT:
The HV generation is interrupted immediately, the set value of the voltage is set to zero.
EPS High Voltage Power Supply series | Last changed on: 2020-12-02 |
www.iseg-hv.com
19/36
