Chapter 3 – ACS 502 Installation Instructions
ACS 502 Installation & Start-up Manual 3-11
Auxiliary 24 VDC
An auxiliary +24 VDC supply is available on Terminals TB1:7 and TB1:8.
This supply can drive auxiliary devices whose total current draw is less than
200 mA.
Digital Inputs
TB1 has six digital inputs, DI1 through DI6 on Terminals TB1:11 through
TB1:16 respectively. The digital inputs use 24 VDC logic from terminal
TB1:10 and are active high.
DI1, DI2, DI5, and DI6 are used by the logic on the Terminal Board when the
115 VAC control transformer is supplied. DI3 and DI4 can be used for Preset
Speeds or floating point control.
Analog Outputs
TB1 has two analog output signals. AO1 is on Terminals TB1:17 and TB1:18.
AO2 is on TB1:19 and TB1:20. These signals are 0 – 20 mA (or 4 – 20 mA),
and can operate into a maximum 500 ohm load. When the Speed Meter is
supplied, it uses AO1.
Digital (Relay) Outputs
Three relay outputs are each Form C. Relay RO1 is on Terminals TB1:21,
TB1:22, and TB1:23. Relay RO2 is on Terminals TB1:24, TB1:25, and
TB1:26. Relay RO3 is on Terminals TB1:27, TB1:28, and TB1:29.
The first terminal for each relay is the normally closed (NC) terminal, the
second is the common, and the third is the normally open (NO) terminal.
Maximum Switching Voltage: 300 VDC / 250 VAC.
Maximum Switching Current/Power: 8 A @ 24 VDC, 0.4 A @ 250 VDC,
or 2000 VA @ 250 VAC.
Maximum Continuous Current: 2 A rms.
If the relay outputs are used to control inductive loads, such as the coils of
relays or contactors, some form of noise supression must be provided at the
load. This is to reduce the electrical noise that could interfere with the
electronics in the drive, as well as increase the life of the contacts in the relay.
AC coils should be supressed with an MOV (metal oxide varistor) or a Series-
Connected RC (resistor capacitor) network, as illustrated below:
MOV should be rated 120 VAC - 240 VAC for 115 VAC circuits, 240 VAC -
320 VAC for 230 VAC circuits, minimum 10 joules. Values for the RC
Network vary, as they effect the opening and closing time. Contact the
contactor manufacturer for recommended values.
X50
MOV
X50
RC network
115 VAC
115 VAC
To Next Page
Loading...
