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Fig 12-4: Individual On/Off control Fig 12-5: Single On/Off control
Fig 12-6: Output voltage trimming
Fig 12-7: Supervisory signals
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.
12.5 Output voltage trimming
Refer to Fig 12-6 for output voltage trimming typical application.
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.
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.
Note: AC_FAIL, DC_OK and TEMP.ALARM are open collector signals.
Application
Monitoring
and Control
circuts
FPS-1000 Module B
FPS-1000 Module C
FPS-S1U
FPS-1000
Module A
12V AUX
AC_FAIL_A
DC_OK_A
TEMP.ALARM_A
SIGNAL RET
10K 10K
10K
11
4
6
16
8
(J1)
ON/OFF_A
FPS-S1U
ON/OFF_B
ON/OFF_C
SIGNAL_RET
ON/
OFF
ON/
OFF
ON/
OFF
UNIT
‘C’
UNIT
‘B’
UNIT
‘A’
11
25
15
5
11
25
15
5
ON/OFF_A
FPS-S1U
ON/OFF_B
ON/OFF_C
SIGNAL_RET
ON/
OFF
FPS-S1U Instruction Manual
13
7
1
10
22
FPS-S1U
+S
V_TRIM_A
V_TRIM_B
V_TRIM_C
-S
R1
R2
+V
-V
FPS-S1U with FPS1000-24 installed:
R2=0.0785*V
2
out -5.819*Vout+105.132
R1(K
Ω)=20(KΩ)-R2(KΩ)
FPS-S1U with FPS1000-48 installed:
R2=0.0497*V
2
out-7.2795*Vout+259.04
R1(K
Ω)=50(KΩ)-R2(KΩ)
FPS-S1U with FPS1000-32 installed:
R2=0.0463*V
2
out -4.5805*Vout+109.49
R1(K
Ω)=20(KΩ)-R2(KΩΩ)
FPS-S1U with FPS1000-12 installed:
R2=0.0324*V
2
out -1.1298*Vout+9.9342
R1(K
Ω)=5(KΩ)-R2(KΩ)