Fault Protection | Elmo PSS 6U, PSS 3U specification

Elmo PSS User Guide	Product Description
MAN-PSSUG (Ver. 3.01)

2-2

Term.	32-pin	Function	Comment
Block	connector
1	12 - 22 (J2)	Power output return (PR)	For DIN mounting, all six pins must be
			connected.

224 - 32 (J1) AC-1 supply input (through an isolated/floating transformer)

For DIN mounting, all five pins must be connected.

314 - 22 (J1) AC-2 supply input (through an isolated/floating transformer)

For DIN mounting, all five pins must be connected.

44 - 12 (J1) AC-3 supply input (through an isolated/floating transformer)

For DIN mounting, all five pins must be connected.

524 - 32 (J2) Positive power output (VP+) For DIN mounting, all five pins must be connected.

6*	4 (J2)	Inhibit indication output	Whenever power supply is inhibited
			(e.g. during thermal/duty cycle), this
			open collector output goes into low
			state (maximum sink current: 10 mA,
			30 VDC).
7**	8 (J2)	Fan supply	24 VDC/0.5 A output for an external
			brushless fan. Common is available in
			terminal 1

Table 2-2:PSS Terminal Description: 6U Power Supplies

*Inhibit indication return is available in terminal 1.

**Available for 60A types only.

2.2Fault Protection

All PSS products include the following protective functions, which activate the internal inhibit:

Over-temperature

Inhibits shunt when heatsink temperature exceeds 90 °C (194 °F).

Duty cycle

Inhibits shunt whenever On and Off time exceeds 5% to 10% (depending on PSS model). This feature protects the shunt regulator when high-inertia loads are driven by the servo amplifier(s) or when too high an AC voltage is applied to the power supply (i.e. DC output is already above the threshold of the shunt).