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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
ON/OFF_B
ON/OFF_C
5
15
25
FPS-S1U
ON/OFF_A
ON/OFF_B
ON/OFF_C
5
15
25
SIGNAL_RET
ON/
OFF
11
ON/
OFF
ON/
OFF
SIGNAL_RET
11
ON/
OFF
UNIT UNIT UNIT
‘C’
‘B’
‘A’
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.
R2=0.0324*V out -1.1298*V out +9.9342
+V
FPS-S1U with FPS1000-12 installed:
2
R1(K Ω )=5(K Ω )-R2(K Ω )
R2=0.0785*V out -5.819*V out +105.132
R2=0.0463*V out -4.5805*V out +109.49
FPS-S1U
+S
V_TRIM_A
V_TRIM_B
V_TRIM_C
-S
13
7
1
10
22
R1
R2
FPS-S1U with FPS1000-24 installed:
2
R1(K Ω )=20(K Ω )-R2(K Ω )
FPS-S1U with FPS1000-32 installed:
2
R1(K Ω )=20(K Ω )-R2(K ΩΩ )
R2=0.0497*V out -7.2795*V out +259.04
-V
Fig 12-6: Output voltage trimming
FPS-S1U with FPS1000-48 installed:
2
R1(K Ω )=50(K Ω )-R2(K Ω )
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)
8
FPS-1000
Module A
12V AUX
AC_FAIL_A
DC_OK_A
TEMP.ALARM_A
16
6
4
10K
10K
10K
Application
Monitoring
and Control
SIGNAL RET
11
circuts
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.
33
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