AMETEK DCS-E 3kW Series - Manual (Page 89)

Sorensen DCS-E Series 3kW Supplies Maintenance
M362295-01 Rev C 6-3
6.3.1 Voltage Programming Circuit Calibration
Designation & Location
(Multiturn trim pots)
Voltage Programming Recalibration Procedure
Voltage Program Offset
(R93)
•
Disconnect any load. Connect a DVM rated at better than 0.5%
accuracy to the power supply output.
• Apply 1% of program voltage
(e.g., 0.1 for 0-10Vdc or 0.05 for 0-5Vdc programming source).
• Adjust R93 until the DVM reads 1% of the rated output voltage
(e.g., 0.6Vdc for Model 60-50).
Voltage Program Scale
(R60)
• Disconnect any load. Connect a DVM rated at better than 0.5%
accuracy to the power supply output.
•
Apply 100% of program voltage
(e.g., 10V for 0-10Vdc or 5V for 0-5Vdc programming source).
•
Adjust R60 until the DVM reads 100% of the rated output voltage
(e.g., 60Vdc for Model 60-50).
6.3.2 Current Programming Circuit Calibration
Designation & Location
(Multiturn trim pots)
Current Programming Recalibration Procedure
Current Program Offset
(R95)
•
Connect a shunt and DVM to the power supply output.
See Note 1.
•
Apply 1% of program voltage
(e.g., 0.1 for 0-10Vdc or 0.05 for 0-5Vdc programming source).
• Adjust R95 until the DVM indicates 1% of the rated output current
(e.g., 0.5A for Model 60-50). See Note 2.
Current Program Scale
(R66)
• Connect a shunt and DVM to the power supply output.
See Note 1.
• Apply 100% of program voltage
(e.g., 10V for 0-10Vdc or 5V for 0-5Vdc programming source).
•
Adjust R66 until the DVM indicates 100% of the rated output
current (e.g., 50A for Model 60-50). See Note 2.
Notes:
1. The DC shunt-DVM combination must be rated at better than 0.5% accuracy.
The recommended current ratings for the DC shunt and connecting wire must
be at least 10% greater than the power supply's output current rating.
2. The required DVM reading is calculated using V=I x R where V is the DVM reading,
I is the current, and R is the DC shunt resistance.
WARNING!
The calibration procedures are performed with the power supply cover off and
the power on. To prevent personal injury, read Section 2.2 Safety and follow
the procedures for removing and replacing the cover in Section 4.2.3. Use a
non-conducting, straight blade adjusting tool for regulating the multiturn trim
pots.