Inovance SV670P Series - Page 76

Description of Fault Codes
‑75‑
Cause
Confirming Method
Solution
Fully‑closed loop phase B
input differential voltage is
too low
1. Measure the phase B
differential voltage to
check if it is below 2.5 V.
2. Check the wiring of the
external encoder.
1. Adjust the fully‑closed
loop phase B input
voltage.
2. Replace the external
encoder or cable.
● E770.2: Fully‑closed loop input phase Z wire breakage
Cause
Confirming Method
Solution
Fully‑closed loop phase Z
input differential voltage is
too low.
1. Measure the phase Z
differential voltage to
check if it is below 2.5 V.
2. Check the wiring of the
external encoder.
1. Adjust the fully‑closed
loop phase Z input
voltage.
2. Replace the external
encoder or cable.
● E770.3: BISS communication protocol timeout
Cause
Confirming Method
Solution
BISS encoder
communication data is not
transmitted back to the
drive.
1. Check the wiring.
2. Check whether H0F.28,
H0F.29, and H0F.30 are
set properly.
1. Check the wiring.
2. Set H0F.28, H0F.29 and
H0F.30 according to the
specifications of the BISS
encoder.
● E770.4: BISS communication CRC check error
Cause
Confirming Method
Solution
BISS encoder
communication data CRC
check error
Check the communication
cable for interference.
Replace the cable with a
shielded twisted pairs.
● E770.5: BISS response data error
Cause
Confirming Method
Solution
BISS fully closed‑loop
external loop encoder
response data error
‑ ‑
● E770.6: Fully closed‑loop 2nd encoder initialization communication error