S p e z i a l e l e k t r o n i k G m b H
iseg Spezialelektronik GmbH
Email: [email protected]
Tel ++ 49 (0)351 / 26 996 - 0
Bautzner Landstr. 23
http://www.iseg-hv.de
Fax ++ 49 (0)351 / 26 996 - 21
14
D - 01454 Radeberg/ Rossendorf
Figure 3.2: Power reduction vs. input voltage
Temperature
Temperature is monitored at several points within the unit. High voltage generation is stopped in case the external air temper-
ature exceeds 35°C (or 50°C for the device class GPS, 350 W, COMPACT) or internal temperature of several modules ex-
ceeds a predefined limiting value.
Warning!
The high voltage generation is reactivated immediately when the limit values are no longer exceeded.
3.2.1
3.3
Interlock
The power supply is equipped with a connector “IL” for a hardware safety loop (interlock, maximum cross section area 1.5mm²)
at the back side.
If the loop is closed an internal current source (open circuit voltage 15 V / short circuit current max. 40 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, fulfils 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.
Warning!
The internal and external capacitances must be discharge by the load before the output will be
voltage-free. The internal discharge resistors have a high resistance, so a very long discharging time
is possible according to the connected load.
The unit is not equipped with an active discharging circuit! Before operations at the load or the high
voltage output of the power supply are started, the high voltage output of the power supply must be
properly grounded.
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 releasing the high voltage generation the closed safety loop
has to be approved.
3.4
ARC Management
The HV power supply is equipped with an ARC Management. An ARC is an almost complete discharge per time unit
An output current greater than 1.5
*
I
nom
. is evaluated as an ARC.
The functionality of the ARC Management can be divided in two operating states:
1. KillEnable active
•
High voltage shuts down after the first ARC
2. KillEnable not active
•
High voltage is restored immediately after the first ARC
•
If an second ARC occur during the time period of 1 second, the control signals of the inverter are blocked
within some µ-seconds for the blanking time (ARC-Wait).
•
At the same time, the internal set value for the output voltage is set to 0. High voltage generation is released
after the time ARC-Wait and the output voltage increases with the adjustable voltage ramp.
The parameters of the ARC-Management are shown in Table 3.2.
Table 3.2: Parameters of the ARC Management
HPS
ARC-Number / second
1
ARC-Wait
1 s
ARC-Ramp
Adjustable voltage ramp
