OVP Module Adjustment Procedures

TM 32-5811-018-14&P

b. OVP Module Adjustment Procedures. The following procedures

should be performed before installing a replacement OVP module. It

may also be used to test a suspected OVP module malfunction. See

figure 6-3 and proceed as follows:

NOTE

Overvoltage protectors are not normally tested or

adjusted because of limited de-de converter adjust-

ment ranges. The following procedure should be

used only for troubleshooting or to set the trip

point of a replacement OVP.

Use

Connect OVP module in circuit shown in figure 6-3.

(1)

current limiting resistor indicated in table 6-2.

(2)

Start with power supply output of O V, slowly increase

voltage while observing voltmeter reading. Note point at

which voltage suddenly drops.

If trip point for OPV module under test differs from speci-

(3)

fication listed in table 6-2, adjust potentiometer on OVP

module clockwise to increase trip-point voltage, or counter-

clockwise to decrease trip-point voltage.

(4)

Return power supply voltage to 0 V to allow OVP module

recovery.

Repeat steps (2), (3), and (4) until correct trip-point

(5)

voltage is obtained.

Place drop of red glyptol (item 28, App. D) on OVP module

(6)

potentiometer shaft to prevent turning or accidental

adjustment during routine procedures.

Install OVP module in power supply; check and adjust voltage

(7)

of corresponding converter module as necessary.