8. Overvoltage protection
ARGOS power supplies are factory equipped with an adjustable threshold overvoltage protection.
The threshold maximum value is 120% of the maximum adjustable output voltage (e.g. 48V for
ARGOS 40-25).
Minimum spacing of threshold to output voltage approx. 0.5V.
8.1 Treshold adjustment:
1. OV control (described as OV adjust on frontpanel) is to be turned clockwise with a screw-
driver until it stops (highest Threshold)
2. Power-up device and adjust output voltage to the desired value of threshold.
3. Turn back the OV control until the LED indicator in the OV-RES button illuminates.
4. Turn back somewhat the adjustment of OV, power device down, then one more time power
up and by slowly turning up the voltage check the value of threshold.
Important
Should the threshold be over the maximum adjustable output voltage of device, a short-circuit
proof auxiliary voltage ( corresponding to the desired threshold) is to be applied on the load
terminal.
8.2 OV RESET:
After an activation of the overvoltage circuit, it remains triggered until a RESET signal occurs.
The OV RESET signal can be generated using a relay contact or a logic signal. Contact will be
established between TB 3-7 and TB 3-14. The logic signal is high-active and should have a high
level between 3.5 and 15 V and a low level under 0.8V. Load of the auxiliary signal is about
10KOhm. The connection of the logic signal is between TB4-11 (GND) and TB4-9 (active).
In case the contact is always closed or the logic signal permanently high, the overvoltage
protection circuit will be ineffective.
CAUTION:
A built-in OV-thyristor (optional), should not be exposed to a permanent current. When an active
load is connected (e.g. accumulator) a redundant diode is to be used between device and load.
In this case the sensing compensation is only possible if the total voltage drop on the sensing
lead and the redundant diode is <2V (2%).
Argos 1200
Page 11 von 16 ISSUE 07/05
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