TOA Electronics FPS1000-24 12.4 On/Off control, Output voltage trimming, Supervisory signals

FPS-S1U Instruction Manual

12.4 On/Off control

Fig 12-4 shows typical connection for individual On/Off control of each installed FPS1000 unit. The On/Off control signal is applied to the DB25 connector located at the rear panel (refer to sec. 10.7.5).

When it is desired to control all the installed units simultaneously, it is possible to connect the On/Off control as shown in Fig 12-5.

FPS-S1U	ON/OFF_A	5
		15
	ON/OFF_B
		25
	ON/OFF_C

ON/ ON/ ON/

OFF OFF OFF

SIGNAL_RET 11

UNIT UNIT UNIT ‘C’ ‘B’ ‘A’

FPS-S1UON/OFF_A ON/OFF_B ON/OFF_C

SIGNAL_RET

5

15

25

11

ON/

OFF

Fig 12-4: Individual On/Off control Fig 12-5: Single On/Off control

12.5 Output voltage trimming

Refer to Fig 12-6 for output voltage trimming typical application.

FPS-S1U with FPS1000-12 installed:

R2=0.0324*V2out -1.1298*Vout+9.9342

+VR1(KΩ)=5(KΩ)-R2(KΩ)

13

FPS-S1U+S

7

V_TRIM_A R1 V_TRIM_B 1

V_TRIM_C	10	R2
	22
-S

-V

Fig 12-6: Output voltage trimming

FPS-S1U with FPS1000-24 installed: R2=0.0785*V2out -5.819*Vout+105.132 R1(KΩ)=20(KΩ)-R2(KΩ)

FPS-S1U with FPS1000-32 installed: R2=0.0463*V2out -4.5805*Vout+109.49 R1(KΩ)=20(KΩ)-R2(KΩΩ)

FPS-S1U with FPS1000-48 installed: R2=0.0497*V2out-7.2795*Vout+259.04 R1(KΩ)=50(KΩ)-R2(KΩ)

12.6 Supervisory signals

Supervisory signals are accessible at the J1-DB25 female connector on the rear panel of the rack. Fig 12-7 shows a typical connection for FPS1000 unit "A" inside the rack.

Units "B" and "C" connections - Reffer to sec 10.7.5.

FPS-S1U		(J1)
	12V AUX	8
FPS-1000		16	10K 10K	Application
Module A	AC_FAIL_A
		6		Monitoring
	DC_OK_A
		4 10K		and Control
	TEMP.ALARM_A
				circuts
	SIGNAL RET 11

FPS-1000 Module B

FPS-1000 Module C

Note: AC_FAIL, DC_OK and TEMP.ALARM are open collector signals.

Fig 12-7: Supervisory signals

12.7 Grounding outputs

Either the positive or negative output terminals can be grounded. To avoid noise problems caused by common-mode current flowing from the load to ground, it is recommended to ground the output terminal as close as possible to the power supply's output. Always use two wires to connect the load to the power supply regardless of how the system is grounded.

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