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Support FAQ - Power Supplies
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1. What problems can occur when a power supply is faulty? A faulty power supply accounts for a significant portion of issues seen on older DynaPath controls, particularly Delta 10/20/30/40/50/60 controls. Spontaneous control re-boots and watchdog (WD) timeouts are usually traced to issues with the power supply. The most obvious and straightforward problem to troubleshoot on a power supply is when there are no DC voltages generated by the supply. Check that the incoming AC power is within specification and that any fuses are good. If these two items check out, disconnect all loads from the power supply and then check for DC voltages to insure that there isn't a short circuit present (the control typically supplies +24VDC for any discrete inputs and outputs, as well as supplying "internal" voltages). As noted in the specifications, the power supplies used in DynaPath controls incorporate short circuit protection and should shut down if a short circuit is detected. If none of these issues exist, the power supply may simply need to be replaced. Another common problem is a large amount of AC "ripple" on the DC voltages generated by the power supply. Excessive ripple has caused watchdog errors, loss of feedback and, in extreme cases, has caused the control to continually re-boot for no apparent reason. Excessive ripple commonly occurs because as a power supply ages, capacitors responsible for controlling the ripple tend to dry out, reducing their effectiveness. For this reason, DynaPath strongly recommends replacing a power supply, rather than trying to repair it. A repaired power supply, while initially appearing to be in good condition, is likely to fail again within a short period. There will always be a small amount of AC ripple present on the DC voltages. An acceptable amount of ripple is less than 30 mV. Measured values higher than this indicate that the power supply should be replaced.
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2. What are the specifications for a Delta 40/50/60 power supply? Delta 40/50/60 controls:
Side View of Delta 40/50/60 Power Supply The power supply pictured above is for illustrative purposes only. Not all Delta 40/50/60 controls will have thumb screws holding the power supply on. In some controls, the ON/OFF switch and fuse holder were removed.
Delta 40/50/60 DC Power Distribution Block Note that the referenced test points are on the back of the card and may only be accessible by removing the card rack cover.
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3. What are the specifications for a Delta 10/20/30 power supply? Delta 10/20/30 controls:
Please note in the diagram above that connector J7 on the backplane is a TEST connector and if the J4 plug is incorrectly inserted in the J7 connector and power is applied, damage WILL occur to both the backplane and circuit cards.
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