Speed Reference - Toshiba T300MVi MEDIUM VOLTAGE Instruction Manual

CIRCUIT OPERATION (cont'd)

Speed Reference

An external speed reference with count 25000/100% weighting is input by serial transmission or
analog input and subjected to rate processing and limit processing to output an SP_R signal. The sign of
the speed reference signal is "+" for normal rotation and "-" for reverse rotation.
SEL_DI=1
25000 count/100%
Jogging (option)
JOG_R
+
SP_REF_AIN1
+
SP_REF_AIN2
+
SP_REF1
SP_REF2
1. Speed references
SP_REF1 or SP_REF2 can be used when the drive speed is to be controlled from one location only. When
using local and remote control or there is a need for selection between two separate inputs SP_REF_AIN1
and SP_REF_AIN2 should be used. To select between references, one of the digital inputs should be
programmed as SEL_DI and the selection switch connected.
SP_REF_AIN1 is used when the SEL_DI input is 0 (Open). SP_REF_AIN2 is used when SEL_DI is 1
(Closed). The start commands (EXT) are also different for this application. When SEL_DI is 0, EXT0
should be used and when SEL_DI is 1, EXT1 should be used.
2. LMT_SP_MIN
LMT_SP_MIN is used as a minimum speed. The drive will run at this speed anytime the start command is
on and the speed reference is less than LMT_SP_MIN.
EXT=1
+
LMT_SP_MIN
<RATE><LIMIT>
CR_RATE_ACC
CR_RATE_DEC
CR_RATE_QSTOP
LMT_SP_F
LMT_SP_R
- 35
SP_R
Speed
Reference