Eurotherm 590A SERIES, Product Manual

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8 - 9
8.5.3 DIAGNOSTIC TEST UNIT - VOLTAGE MEASUREMENTS
TEST
NO. DIAGNOSTIC TEST POINT DESCRIPTION CONDITION VOLTAGE
19 CURRENT DEMAND ISOLATE
Connects directly to terminal 18.
Note:
1. For speed control operation leave terminal
18 open circuit.
2. For current control operation connect terminal
18 to 0 Volts.
Speed control
Current control
+15V
0V
20 AUXILIARY CURRENT INPUT
Connects directly to terminal 20.
Only operational if selected (See Diagnostic 21).
Variable Input (if used):
Positive Bridge current = 200%
FLC*
Zero Current
Negative Bridge current = 200%
FLC* (590A/598A only)
* FLC = Full Load Current
+10V
0V
-10V
21 SELECT AUXILIARY INPUT
Connects directly to terminal 21.
Note:
1. To select input connect terminal 21 to 0
Volts .
2. To disconnect input leave terminal 21 open
circuit.
Select Input
Disconnect Input
0V
+15V
22 AUXILIARY CURRENT LIMIT (POSITIVE)
Connects directly to terminal 22.
Note:
1. This positive current limit only operates up
to the limit set by the Main Current Limit
preset (P7) at Diagnostic 24.
2. If no special limit is required leave terminal
22 open circuit.
Terminal 22 open circuit.
Variable Input:
Positive current limit = 200% FLC*
Positive current limit zero
*FLC = Full Load Current
+12V
±
2V
+10V
0V
23 AUXILIARY CURRENT LIMIT (NEGATIVE)
Connects directly to terminal 25.
Note:
1. This negative current limit only operates up
to the limit set by the Main Current Limit
preset (P7) at Diagnostic 24.
2. If no special limit is required leave terminal
25 open circuit.
3. IN ALL 591A/599A APPLICATIONS
TERMINAL 25 MUST BE OPEN
CIRCUIT.
Terminal 25 open Circuit (see note
3).
Variable Input:
Negative current limit = 200%
FLC*
Negative current limit zero
*FLC = Full Load Current
-12V
±
2V
-10V
0V
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