Installing A Circuit Protector; Installing Current Control Switches; Insulation Resistance And Voltage Breakdown Tests - Yamaha DRCX User Manual

2-2-4 Installing a circuit protector

An inrush current, which might be from several to nearly 20 times higher than the rated current, flows
at the instant that the DRCX controller is turned on or the robot motors start to operate.
When installing an external circuit protector for the robot controller, select a circuit protector that
provides optimum operating characteristics.
To ensure proper operation, we recommend using a medium to slow response circuit protector with
an inertial delay function. (Refer to the circuit protector manufacturer's data sheets for making the
selection.)

2-2-5 Installing current control switches

When controlling the power on/off of the robot controller from an external device such as a PLC, a
current control switch (contactor, breaker, etc.) may be used. In this case, the current control switch
usually creates a large on/off inrush current. To minimize this on/off inrush current, surge killers
must be installed for surge absorption. Connect a surge killer in parallel with and close to each
contact of the current control switch.
Recommended surge killer:
Okaya Electric XE1201, XE1202, RE1202
Example:

2-2-6 Insulation resistance and voltage breakdown tests

Never attempt insulation resistance tests or voltage breakdown tests on the DRCX controller. Since
capacitive grounding is provided between the controller body and 0V, these tests may mistakenly
detect excess leakage current or damage the internal circuitry. If these tests are required, please
consult your YAMAHA sales office or representative.
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Example
Rated current
DRCX 20A
AC IN
2-2 Connecting the Power Supply
Operating characteristics
Slow type with inertia delay
300% 2 sec.
(
1000% 0.01 sec.
Controller
: Surge killer
: Contactor
L
N
2
)
5
2-