Table of Contents
Advertisement
14. Set output current to +100 Amps. The DVM
should read about +66 mV. After about 1
minute, the DVM should read +66.666 mV
±0.233 mV (not including offset from Step 9).
15. Set output current to -50 Amps. The DVM
should read about -33 mV. After about 1 minute,
the DVM should read -33.333 mV ±0.117 mV
(not including the offset from Step 9).
16. Set output current to -100 A mps. The DVM
should read about -66 mV. After 1 minute, the
DVM should read -66.666 mV ±0.233 mV (not
including the offset from Step 9).
5.5
REAR PANEL CONNECTOR DETAILS
Figure 5-1 MPS Rear Panel Connectors
Table 5-1 Rear Panel Connector Definitions
TERMINAL
LABEL
1
RI+
2
RI–
3
FLT +
4
FLT–
5
ON+
6
ON–
7
Reserved
8
OVP
9
Im
10
Vm
11
m
12
Vp
13
+Vs
14
–Is
15
Ip
16
+Is
17
–S
18
+S
5-6
Lake Shore Model 647 Magnet Power Supply User's Manual
DEFINITION
Remote Inhibit – Active low, TTL-compatible input to remotely
disable the output (force the output settings to 0 A and 1 V).
Fault Indicator – Normally open contact closure to indicate a
fault condition has occurred. Contact rating: 0.25 A resistive at
100 VDC, 3 W, 25 VA.
ON Indicator – Contact closure to indicate when the front panel
circuit breaker is in the ON position. Contact rating: 0.25 A
resistive at 100 VDC, 3 W, 25 VA.
None
Overvoltage Protection Enable – Analog signal connected in
parallel to other MPS Units to remotely activate the output
overvoltage protection circuit.
Output Current Monitor – Voltage output from Im to GND(M) is
±0.01 V/A.
Output voltage monitor – Voltage output from Vm to GND(M) is
±0.01 V/V.
Monitor and program ground. GND(M).
Factory Use Only
Factory Use Only
Enable external output current programming via MODE switch.
Voltage input from Ip to GND(M) is ±0.01 V/A.
A 10 k potentiometer from +Is to –Is with center tap to Ip
produces the minimum voltage for full scale current output
(±1.25 V for Model 622 or ±1.55 V for Model 623). Voltage
applied to Ip sums with internal current programming voltage.
Remote voltage sense correction. Correction for load lead drops
of up to 0.5 V per lead.
17. Set output current to 0 A.
Fault/RI Operation Verification
18. Short the MPS RI input with a shorting jumper.
MPS output current should drop to 0 A, and the
alarm should sound about once per second.
Verify the MPS displays the RI screen shown in
Paragraph 3.7.1.
19. With the unit ON, disconnect AC power
connector. The front panel circuit breaker should
trip.
20. The performance verification is complete.
Table 5-2 Serial Interface
PIN
1
2
3
4
5
6
Figure 5-2 Serial
Interface Connector
Connector Definition
RS-232C
RS-485
FUNCTION
FUNCTION
No
No
Function
Connection
Receive
A
Data
Signal
No
Ground
Connection
Signal
No
Ground
Connection
Transmit
B
Data
No
No
Connection
Connection
Troubleshooting
Advertisement
Table of Contents
