Chapter 7—Monitoring and Diagnostics
Power Xpert C445 Global Motor Management Relay MN042003EN—January 2019 www.eaton.com 141
Monitoring Parameters
A list and description of the available operating parameters
for monitoring is shown below.
Table 53. Current Based Monitoring
Parameter Name Range/Units Description
I Phase A (L1) Depends on frame size (amps) Phase A (L1) motor current. 2% accuracy within 30–125% of FLA.
I Phase B (L2) Depends on frame size (amps) Phase B (L2) motor current. 2% accuracy within 30–125% of FLA.
I Phase C (L3) Depends on frame size (amps) Phase C (L3) motor current. 2% accuracy within 30–125% of FLA.
Average Current Depends on frame size (amps) Average motor current. 2% accuracy within 30–125% of FLA.
Current Unbalance 0–100% Motor current unbalance percent
I Average % of FLA 0–720% of FLA (amps) Average motor current as a percentage of FLA
Max Starting Current Depends on frame size (amps) Maximum motor starting current
GF Current RMS Depends on frame size (amps), scaled
via fieldbus
Motor ground fault current RMS. Accuracy meets UL-1053 / IEC Class II-B
I Phase A (L1) Scaled Depends on frame size (amps, scaled) Phase A (L1) motor current scaled. Scaled by parameter “I Scale Factor.”
I Phase B (L2) Scaled Depends on frame size (amps, scaled) Phase B (L2) motor current scaled. Scaled by parameter “I Scale Factor.”
I Phase C (L3) Scaled Depends on frame size (amps, scaled) Phase C (L3) motor current scaled. Scaled by parameter “I Scale Factor.”
Average Current Scaled Depends on frame size (amps, scaled) Average motor current scaled. Scaled by
parameter “I Scale Factor.”
I Scale Factor Motor current scale factor
Table 54. Voltage Based Monitoring
Parameter Name Range/Units Description
L1-L2 0–690 V; max 4,160 V with PT ratios Supply line-to-line voltage AB (L1-L2). 2% accuracy up to 690 Vac
L2-L3 0–690 V; max 4,160 V with PT ratios Supply line-to-line voltage BC (L2-L3). 2% accuracy up to 690 Vac
L3-L1 0–690 V; max 4,160 V with PT ratios Supply line-to-line voltage CA (L3-L1). 2% accuracy up to 690 Vac
Average Voltage 0–690 V; max 4,160 V with PT ratios Supply line-to-line voltage average. 2% accuracy up to 690 Vac
Frequency 47–63 Hz (centi-Hz) Supply frequency in centi-Hz
Phase Order 0: unknown;
1: ABC (L1-L2-L3);
2: ACB (L1-L3-L2)
Reports phase sequence of the line voltage
Voltage Unbalance 0–100% Supply voltage unbalance percentage
L1-L2 Scaled V, scaled Supply line-to-line voltage AB (L1-L2) scaled
L2-L3 Scaled V, scaled Supply line-to-line voltage BC (L2-L3) scaled
L3-L1 Scaled V, scaled Supply line-to-line voltage CA (L3-L1) scaled
Average Voltage Scaled V, scaled Supply line-to-line voltage average scaled
Voltage Scale Factor Voltage scale factor applied to scaled voltage measurements
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