RKC INSTRUMENT Z-TIO-G, Instruction Manual, Page: 236 / 246

12. APPENDIX
12-6
IMS01T28-E4
12.4 Peak Current Suppression Function
When the output type is time proportional output, the Peak current suppression function changes the start
timing of the proportional cycle so that the outputs of the channels do not turn ON simultaneously. The
Peak current suppression function operates within one Z-TIO module. To use this function, the
Proportional cycle time (P. 9-34) and the Output limiter (P. 9-73) must be set to the required conditions.

Action
* The output limiter setting conditions are determined in the order “Four-division setting

three-division setting

two-division setting.”

Requirements for start of peak current suppression function
Requirements
for start
The start timing of control (RUN/STOP transfer: RUN, operation mode: control)
must be the same for each applicable channel.
The proportional cycles of the applicable channels must be the same.
The control action must be PID control (Direct action/Reverse action).
Caution is required if the proportional cycle is changed after starting, as the channels may turn
ON simultaneously
The use of peak current suppression function in the load used in the three phase power supply
system may not suppress the peak current. This is because the peak current suppression function
works on condition that the target (object) channels are time-proportionally controlled on the
voltage with the same frequency. Because of this, if zero-crossing points of the frequency of each
channel are different from one another, outputs of different channels may be overlapped and as a
result the peak current suppression function may not work properly.
The Z-TIO-G module only uses channels 1 and 2.
Two-division setting:
<Output limiter setting conditions>*
When two channels are prevented from turning ON simultaneously
(two-division setting), the output limiters of the channels affected by the
two-division setting must be set to 50 % or less.
When the output limiters of all channels are set to 50% or less,
CH1 and CH2, and CH3 and CH4, will not turn ON
simultaneously.
When the output limiters of three channels are set to 50% or
less, the two channels with the lowest channel numbers will not
turn ON simultaneously.
For example, if CH1 through CH3 are set to 50% or less, CH1
and CH2 will not turn ON simultaneously.
CH1
CH2
Start of proportional cycle is delayed 1/2 cycle
Control start
Four-division setting:
<Output limiter setting conditions>*
When four channels are prevented from turning ON simultaneously
(four-division setting), the output limiters all four channels affected by
the four-division setting must be set to 25 % or less.
CH1
CH2
CH3
Start of proportional cycle is delayed 1/4 cycle
CH4
Control start
Three-division setting: <Output limiter setting conditions>*
When three channels are prevented from turning ON simultaneously
(three-division setting), the output limiters of the channels affected by
the three-division setting must be set to 33.3 % or less.
When the output limiters of all four channels are 33.3 % or less,
CH1, CH2, and CH3 will not turn ON simultaneously.
CH1
CH2
Control start
Start of proportional cycle is delayed 1/3 cycles
CH3